JP2008135651A - Tap switching apparatus used in loading case - Google Patents

Tap switching apparatus used in loading case Download PDF

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JP2008135651A
JP2008135651A JP2006322068A JP2006322068A JP2008135651A JP 2008135651 A JP2008135651 A JP 2008135651A JP 2006322068 A JP2006322068 A JP 2006322068A JP 2006322068 A JP2006322068 A JP 2006322068A JP 2008135651 A JP2008135651 A JP 2008135651A
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contact
valve
movable
drive shaft
tap
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JP4764318B2 (en
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Yukinobu Takiguchi
幸延 瀧口
Osamu Kaneki
修 鹿子木
Yoshinobu Taniguchi
嘉信 谷口
Kenichiro Fukumoto
健一郎 福元
Tatsuo Hashimoto
竜男 橋本
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Toshiba Corp
Toshiba Plant Systems and Services Corp
Toshiba Substation Equipment Technology Corp
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Toshiba Corp
Toshiba Plant Systems and Services Corp
Toshiba Substation Equipment Technology Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/0005—Tap change devices
    • H01H9/0038—Tap change devices making use of vacuum switches

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Abstract

<P>PROBLEM TO BE SOLVED: To make compact the whole of a tap switching apparatus used in the loading case of a transformer and realize its stable current application and its sure switching operation, by using a two-resistances and three-valves switching method. <P>SOLUTION: The tap switching apparatus used in the loading case of a transformer comprises: two current limiting resistances and resistance-valves each of which is so connected in series with each other as to be interposed between a neutral point of the transformer and each of two movable contacts of a tap selecting device for selecting the taps of a tap winding; a converting switch S comprising static contacts each of which is interposed between each movable contact and each current limiting resistance of the tap selecting device and comprising a movable contact for selecting one of the static contacts; and also a main valve whereby the movable contact of the converting switch and the neutral point of the transformer. Moreover, in the lower end portion of a driving axis 2 driven in a rotary way by an energy accumulating device 1, this tap switching apparatus used in the loading case of the transformer has: a vacuum-valve opening/closing mechanism 30 having a cum 5 for opening/closing the resistance-valves and main valve in a predetermined order and having an actuating portion for opening/closing by the rotation of the cum 5 the resistance-valves and main valve so disposed in the outer periphery of the center of this cum that they correspond to the ones of the respective three-phases of the transformer; and above the cum 5 a movable portion 50 for driving concentrically to the driving axis 2 the movable contact of the converting switch S. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、２抵抗３バルブ方式を用いた負荷時タップ切換器に関する。   The present invention relates to a load tap changer using a two-resistance three-valve system.

近年、負荷時タップ切換器を構成する切換開閉器は、遮断要素として真空バルブが使用されてきている。例えば、１相あたり２個の限流抵抗と４個の真空バルブを有する２抵抗４バルブ切換方式の切換開閉器がある（特許文献１）。   In recent years, a vacuum switch has been used as a shut-off element in a switching switch that constitutes a load tap changer. For example, there is a two-resistor four-valve switching type switching switch having two current limiting resistors and four vacuum valves per phase (Patent Document 1).

この２抵抗４バルブ切換方式の切換開閉器は、各々のタップに真空バルブを直列に２個接続するため、真空バルブ接点間の耐電圧保護に優れ、信頼性が高いが、３相を構成するのに真空バルブが１２個必要となり、切換開閉器の真空バルブが占めるスペースが大きく、絶対的に切換開閉器の寸法が大きくなる。   This two-resistor four-valve switching type switching switch is connected to each tap with two vacuum valves in series, so it has excellent withstand voltage protection between the vacuum valve contacts and is highly reliable, but constitutes three phases. However, twelve vacuum valves are required, the space occupied by the vacuum valve of the switching switch is large, and the size of the switching switch is absolutely large.

また、２抵抗４バルブ切換方式に対し、真空バルブが少ない切換方式として１相あたり１個の限流抵抗と２個の真空バルブを有する１抵抗２バルブ切換方式の切換開閉器（特許文献２、特許文献３）や、１相あたり１個の限流抵抗と３個の真空バルブを有する１抵抗３バルブ方式の切換開閉器が提案されている（特許文献４）。   Further, as compared with the 2-resistance 4-valve switching system, a switching system of a 1-resistor 2-valve switching system having one current limiting resistor and two vacuum valves per phase as a switching system with few vacuum valves (Patent Document 2, Patent Document 3) and a 1-resistor 3-valve type switching switch having one current limiting resistor and three vacuum valves per phase have been proposed (Patent Document 4).

しかし、１抵抗２バルブ切換方式の切換開閉器は、切換時に遮断回数が多い真空バルブの遮断電流が負荷電流と循環電流が重畳した大きい電流となることがあり、真空バルブのアーク接点の消耗を進めることがある。また、１抵抗３バルブ切換方式の切換開閉器は各々のタップに真空バルブが直接接続されることから、真空バルブの接点間の保護が必要となる。   However, in the switching switch of 1-resistor 2-valve switching system, the breaking current of the vacuum valve, which is frequently shut off at the time of switching, may become a large current in which the load current and circulating current are superimposed, and the arc contact of the vacuum valve is consumed. May advance. In addition, since the 1-resistor 3-valve switching type switching switch has a vacuum valve directly connected to each tap, protection between the contacts of the vacuum valve is required.

そこで、真空バルブ接点間の絶縁低下による保護装置を必要とせず、３相で真空バルブが９個で済む１相あたり２個の限流抵抗と３個の真空バルブを有する２抵抗３バルブ方式の切換開閉器が提案されている（特許文献５、特許文献６）。
特公昭６２−０１６００４号公報 特許第３３５６４４６号公報 特開平１１−２８３８４９号公報 特開昭５７−１９４５０９号公報 特公昭６１−０１５５６９号公報 特公昭６１−０１８３３１号公報 Therefore, there is no need for a protective device due to insulation deterioration between the vacuum valve contacts, and a two-resistor three-valve system with two current-limiting resistors and three vacuum valves per phase, which requires nine vacuum valves for three phases. A switching switch has been proposed (Patent Documents 5 and 6).
Japanese Examined Patent Publication No. 62-016004 Japanese Patent No. 3356446 JP-A-11-283849 JP 57-194509 A Japanese Patent Publication No. 61-015569 Japanese Patent Publication No. 61-018331

しかし、これら２抵抗３バルブ方式の切換開閉器は、いずれも回路構成やタップ切換手順についてのものであり、２個の限流抵抗、３個の真空バルブ、切換スイッチ、これらを駆動する駆動軸、カム及び真空バルブの開閉機構などの配置構成や組合せを如何にすれば安定した切換動作と通電を可能にしてコンパクトにできるかという観点から捉えた実用的な構成のものがいまだ実現していないのが現状である。   However, these two-resistor three-valve type switching switches are all related to the circuit configuration and the tap switching procedure. Two current limiting resistors, three vacuum valves, changeover switches, and a drive shaft for driving them. In addition, no practical configuration has yet been realized from the viewpoint of how the arrangement and combination of the cam and vacuum valve opening and closing mechanisms can be made compact by enabling stable switching operation and energization. is the current situation.

本発明は上記のような事情に鑑みてなされたもので、２抵抗３バルブ切換方式を用いて安定した通電と確実な切換動作を実現できるコンパクトな負荷時タップ切換器を提供することを目的とする。   The present invention has been made in view of the above circumstances, and an object thereof is to provide a compact on-load tap changer that can realize stable energization and reliable switching operation using a two-resistor three-valve switching method. To do.

本発明は上記の目的を達成するため、次のような配置構成の負荷時タップ切換器とするものである。   In order to achieve the above object, the present invention provides a load tap changer having the following arrangement.

本発明は、タップ巻線のタップを選択する２個の可動接点を有するタップ選択器の前記各可動接点と変圧器の中性点との間にそれぞれ直列に接続して設けられた限流抵抗及び真空バルブからなる抵抗バルブと、前記タップ選択器の各々の前記可動接点と前記限流抵抗との間にそれぞれ設けた固定接点と該固定接点の一方を選択する可動接点からなる切換スイッチと、この切換スイッチの可動接点と前記中性点との間に接続された真空バルブからなる主バルブとからなる負荷時タップ切換器において、鉛直に設けられ、蓄勢装置により回動駆動される駆動軸と、この駆動軸の下端部に取付けられ、前記駆動軸の回動により前記抵抗バルブ及び主バルブを所定の順序で開閉させるカムと、このカムの外周部に前記駆動軸と平行に配置された抵抗バルブ及び主バルブに直結して設けられ、前記カムの回動により軸方向に作動して前記抵抗バルブ及び主バルブを開閉動作させる作動部を備えた真空バルブ開閉機構と、前記駆動軸と同軸的に且つ前記カムの上方に配置され、前記駆動軸の動作に連動して前記切換スイッチの可動接点を駆動する可動部とを備える。   The present invention provides a current limiting resistor provided in series between each movable contact of a tap selector having two movable contacts for selecting a tap of a tap winding and a neutral point of a transformer. And a resistance valve comprising a vacuum valve, a changeover switch comprising a fixed contact provided between each of the movable contact and the current limiting resistor of each of the tap selectors, and a movable contact for selecting one of the fixed contacts, In a load tap changer comprising a main valve comprising a vacuum valve connected between the movable contact of the changeover switch and the neutral point, a drive shaft provided vertically and rotated by an accumulator And a cam that is attached to the lower end of the drive shaft and opens and closes the resistance valve and the main valve in a predetermined order by rotation of the drive shaft, and is arranged in parallel with the drive shaft on the outer periphery of the cam. Resistance bar A vacuum valve opening / closing mechanism provided directly connected to the valve and the main valve, and operating in the axial direction by the rotation of the cam to open and close the resistance valve and the main valve, and coaxial with the drive shaft And a movable part that is disposed above the cam and drives the movable contact of the changeover switch in conjunction with the operation of the drive shaft.

また、上記構成に加えて、タップ巻線のタップを選択するタップ選択器の２個の可動接点と限流抵抗との間に、前記切換スイッチの固定接点と並列に接続される第２の固定接点と前記中性点に接続され、且つ前記第２の固定接点の一方を選択する第２の可動接点とを備えた通電接点を設け、この通電接点の第２の固定接点を前記切換スイッチの固定接点の上方に配置し、第２の可動接点を前記駆動軸と同軸的に且つ前記駆動軸の動作により駆動されるように配置する。   In addition to the above configuration, a second fixed connected in parallel with the fixed contact of the changeover switch between the two movable contacts of the tap selector for selecting the tap of the tap winding and the current limiting resistor. An energizing contact provided with a contact and a second movable contact that is connected to the neutral point and selects one of the second fixed contacts is provided, and the second fixed contact of the energizing contact is connected to the changeover switch. It arrange | positions above a fixed contact, and arrange | positions so that a 2nd movable contact may be driven by the operation | movement of the said drive shaft coaxially with the said drive shaft.

さらに、本発明は、タップ巻線のタップを選択する２個の可動接点を有するタップ選択器の前記各可動接点と変圧器の中性点との間にそれぞれ直列に接続して設けられた限流抵抗及び真空バルブからなる抵抗バルブと、各々の前記可動接点と前記限流抵抗との間にそれぞれ設けた固定接点と該固定接点の一方を選択する可動接点からなる切換スイッチと、
この切換スイッチの可動接点と前記中性点との間に接続された真空バルブからなる主バルブとからなる負荷時タップ切換器において、鉛直に設けられ、蓄勢装置により回動駆動される駆動軸と、この駆動軸の上部に取付けられ、前記駆動軸の回動により前記抵抗バルブ及び主バルブを所定の順序で開閉させるカムと、このカムの外周部に前記駆動軸と平行に配置された抵抗バルブ及び主バルブに直結して設けられ、前記カムの回動により軸方向に作動して前記抵抗バルブ及び主バルブを開閉動作させる作動部を備えた真空バルブ開閉機構と、前記駆動軸と同軸的に且つ前記カムの下方に配置され、前記駆動軸の動作に連動して前記切換スイッチの可動接点を駆動する可動部と、前記切変スイッチの可動部の外周上に配置した固定接点とを備え、前記前記抵抗バルブ及び主バルブと前記中性点を接続する導体を前記駆動軸と同軸的に配置する。 Furthermore, the present invention provides a limit provided by connecting in series between each movable contact of the tap selector having two movable contacts for selecting the tap of the tap winding and the neutral point of the transformer. A resistance valve comprising a flow resistance and a vacuum valve, a fixed switch provided between each of the movable contacts and the current limiting resistor, and a changeover switch comprising a movable contact for selecting one of the fixed contacts;
In a load tap changer comprising a main valve comprising a vacuum valve connected between the movable contact of the changeover switch and the neutral point, a drive shaft provided vertically and rotated by an accumulator A cam attached to the upper portion of the drive shaft and opening and closing the resistance valve and the main valve in a predetermined order by rotation of the drive shaft, and a resistor disposed on the outer periphery of the cam in parallel with the drive shaft A vacuum valve opening / closing mechanism which is provided directly connected to the valve and the main valve and is operated in the axial direction by the rotation of the cam to open and close the resistance valve and the main valve; and coaxial with the drive shaft And a movable part that is disposed below the cam and that drives the movable contact of the changeover switch in conjunction with the operation of the drive shaft, and a fixed contact that is disposed on the outer periphery of the movable part of the switching switch. Wherein said placing a resistor valve and the main valve conductor for connecting said neutral point and coaxially with said drive shaft.

本発明によれば、デッドスペースを有効に活用でき、コンパクトな配置が可能になると共に、駆動軸、カム、切換スイッチの全てを同軸で駆動するため、複雑な機構とならずに２抵抗３バルブ切換方式の安定した切換シーケンスを得ることができる。   According to the present invention, the dead space can be effectively utilized, a compact arrangement is possible, and all of the drive shaft, cam, and changeover switch are driven coaxially, so there is no complicated mechanism and a two-resistance three-valve. A stable switching sequence of the switching system can be obtained.

以下本発明の実施形態について図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the drawings.

（第１の実施形態）
図１は、本発明の第１の実施形態である２抵抗３バルブ切換方式を用いた切換開閉器の切換回路図であり、図２はその切換シーケンスを示す図である。 (First embodiment)
FIG. 1 is a switching circuit diagram of a switching switch using a two-resistance three-valve switching system according to the first embodiment of the present invention, and FIG. 2 is a diagram showing a switching sequence thereof.

図１において、ＴＷはタップ巻線を示し、タップ選択器の可動接点Ｍ１、Ｍ２がタップ間に接続されている。この可動接点Ｍ１、Ｍ２と３相変圧器の中性点Ｎの間には、可動接点Ｍ１、Ｍ２に限流抵抗Ｒ１と抵抗バルブＷ１、限流抵抗Ｒ２と抵抗バルブＷ２が直列にそれぞれ接続され、その一端は中性点Ｎに接続されている。   In FIG. 1, TW indicates a tap winding, and movable contacts M1 and M2 of the tap selector are connected between the taps. Between the movable contacts M1 and M2 and the neutral point N of the three-phase transformer, a current limiting resistor R1 and a resistance valve W1, and a current limiting resistor R2 and a resistance valve W2 are connected in series to the movable contacts M1 and M2, respectively. , One end of which is connected to the neutral point N.

主バルブＨは、可動接点Ｍ１と限流抵抗Ｒ１の間に設けた固定接点Ｓ１と可動接点Ｍ２と限流抵抗Ｒ２の間に設けた固定接点Ｓ２のいずれか一方を選択的に可動接点ＳＭと接続され、主バルブＨの一端は中性点Ｎに接続されている。   The main valve H selectively selects one of the fixed contact S1 provided between the movable contact M1 and the current limiting resistor R1 and the fixed contact S2 provided between the movable contact M2 and the current limiting resistor R2 as the movable contact SM. One end of the main valve H is connected to the neutral point N.

これら２個の抵抗バルブと主バルブは、それぞれ真空バルブが用いられている。   A vacuum valve is used for each of the two resistance valves and the main valve.

図１は図２（ａ）に（イ）〜(ト)で示した切換過程を順に追って示したものである。以下その切換動作について説明する。   FIG. 1 shows the switching process shown in (a) to (g) in FIG. The switching operation will be described below.

いま、（イ）に示すように主バルブＨおよび抵抗バルブＷ１は閉極し、切換スイッチＳの可動接点ＳＭが固定接点Ｓ１に接続され、タップ選択器のタップ端子Ｍ１がタップ巻線に接続された運転状態にあるものとする。このとき、負荷電流ＩＬは、点線のように中性点Ｎから主バルブＨ、切換スイッチＳの可動接点ＳＭ、固定接点Ｓ１、タップ巻線ＴＷという回路に流れる。   Now, as shown in (a), the main valve H and the resistance valve W1 are closed, the movable contact SM of the changeover switch S is connected to the fixed contact S1, and the tap terminal M1 of the tap selector is connected to the tap winding. It is assumed that the machine is in the operating state At this time, the load current IL flows from the neutral point N to a circuit including the main valve H, the movable contact SM of the changeover switch S, the fixed contact S1, and the tap winding TW as indicated by a dotted line.

この状態から切換動作が開始すると、まず（ロ）に示すように主バルブＨが開く。このとき負荷電流ＩＬは、点線のように抵抗バルブＷ１、限流抵抗Ｒ１、タップ巻線ＴＷという回路に流れる。   When the switching operation starts from this state, first, the main valve H is opened as shown in (b). At this time, the load current IL flows through a circuit including a resistance valve W1, a current limiting resistor R1, and a tap winding TW as indicated by a dotted line.

次に（ハ）に示すように抵抗バルブＷ２が閉極すると、限流抵抗Ｒ２、抵抗バルブＷ２、抵抗バルブＷ１、限流抵抗Ｒ１を介して短絡回路が形成され、循環電流ＩＣが流れる。また、負荷電流ＩＬは中性点から、抵抗バルブＷ１、限流抵抗Ｒ１の回路と抵抗バルブＷ２、限流抵抗Ｒ２の回路に、限流抵抗Ｒ１、Ｒ２の抵抗比に見合って分流する。   Next, when the resistance valve W2 is closed as shown in (c), a short circuit is formed through the current limiting resistor R2, the resistance valve W2, the resistance valve W1, and the current limiting resistor R1, and the circulating current IC flows. Further, the load current IL is diverted from the neutral point to the circuit of the resistance valve W1 and the current limiting resistor R1 and the circuit of the resistance valve W2 and the current limiting resistor R2 in accordance with the resistance ratio of the current limiting resistors R1 and R2.

その後、切換スイッチＳの可動接点ＳＭが(ニ)に示すように固定接点Ｓ１から固定接点Ｓ２へと移動を開始する。   Thereafter, the movable contact SM of the changeover switch S starts to move from the fixed contact S1 to the fixed contact S2, as shown in FIG.

続いて、（ホ）に示すように抵抗バルブＷ１が開極する。このとき負荷電流ＩＬは、点線のように抵抗バルブＷ２、限流抵抗Ｒ２、タップ巻線ＴＷという回路に流れる。   Subsequently, the resistance valve W1 is opened as shown in (e). At this time, the load current IL flows through a circuit such as a resistance valve W2, a current limiting resistor R2, and a tap winding TW as indicated by a dotted line.

そして、切換スイッチＳの可動接点ＳＭが（へ）に示すように固定接点Ｓ２へと移動を完了する。   Then, the movable contact SM of the changeover switch S completes the movement to the fixed contact S2 as shown in (f).

最後に（ト）に示すように主バルブＨが閉極し、負荷電流ＩＬを中性点Ｎから主バルブＨ、切換スイッチＳの可動接点ＳＭ、固定接点Ｓ２、タップ巻線ＴＷという回路に移す。   Finally, as shown in (g), the main valve H is closed, and the load current IL is transferred from the neutral point N to the circuit of the main valve H, the movable contact SM of the changeover switch S, the fixed contact S2, and the tap winding TW. .

これで、切換動作を完了し、図示の状態で運転を継続する。   Thus, the switching operation is completed and the operation is continued in the state shown in the drawing.

また、次のタップへの切換動作は図２（ｂ）に示す（ト）から（イ）への順で行われる。   Further, the switching operation to the next tap is performed in the order from (G) to (A) shown in FIG.

この切換方式では、タップ選択器の可動接点Ｍ１、Ｍ２にそれぞれに限流抵抗Ｒ１と限流抵抗Ｒ２が接続されているため、真空バルブ極間に過電圧が印加されても、常に限流抵抗Ｒ１あるいはＲ２を介してタップ間短絡回路を形成することになり、真空バルブの接点間の耐電圧保護装置を必要としない。   In this switching method, the current limiting resistor R1 and the current limiting resistor R2 are connected to the movable contacts M1 and M2 of the tap selector, respectively. Therefore, even if an overvoltage is applied between the vacuum valve electrodes, the current limiting resistor R1 is always applied. Or the short circuit between taps will be formed via R2, and the withstand voltage protection apparatus between the contacts of a vacuum valve is not required.

また、遮断回数の多い主バルブＨの遮断電流の最大値は負荷電流ＩＬであり、主バルブの遮断電流の最大値を抑えることができる。万が一、図１（ハ）の状態において、主バルブＨの遮断失敗が生じても、切換スイッチＳにより強制的に回路を開くことができるので、切換スイッチにおいて電流遮断が可能となり、信頼性の高い切換能力を有している。   Further, the maximum value of the cutoff current of the main valve H having a large number of cutoffs is the load current IL, and the maximum value of the cutoff current of the main valve can be suppressed. In the state of FIG. 1C, even if the main valve H fails to be shut down, the circuit can be forcibly opened by the changeover switch S, so that the current can be cut off at the changeover switch and the reliability is high. Has switching ability.

次に本発明の２抵抗３バルブ切換方式を用いた負荷時タップ切換器の実施形態の具体的構成について図３〜図９を用いて説明する。   Next, a specific configuration of an embodiment of the on-load tap changer using the two-resistance three-valve switching method of the present invention will be described with reference to FIGS.

図３は、２抵抗３バルブ切換方式を用いた切換開閉器の断面図、図４（ａ），（ｂ）は真空バルブ開閉機構部の一部を拡大して示す断面図であり、図５〜図８はそれぞれ図３におけるＡ−Ａ線、Ｂ−Ｂ線、Ｃ−Ｃ線、Ｄ−Ｄ線に沿う矢視断面図である。また、図９は各可動接点に用いるスライド接点の詳細図である。   3 is a cross-sectional view of a switching switch using a 2-resistance 3-valve switching system, and FIGS. 4A and 4B are cross-sectional views showing an enlarged part of a vacuum valve opening / closing mechanism. 8 is a cross-sectional view taken along lines AA, BB, CC, and DD in FIG. 3, respectively. FIG. 9 is a detailed view of a slide contact used for each movable contact.

図３において、１は図示しない電動操作機構からの動力を受けてばねを蓄勢し、所定のエネルギを蓄勢した後、瞬発的にそのエネルギを放勢する蓄勢装置である。２はこの蓄勢装置１の出力軸に直結された駆動軸で、この駆動軸２は鉛直方向に適宜離間させて水平にそれぞれ設けられた上部プレート３及び下部プレート４、６の中心部にベアリング３ａ、４ａ、６ａによって回動自在に軸支されている。   In FIG. 3, reference numeral 1 denotes a storage device that receives power from an electric operation mechanism (not shown) to store a spring, stores a predetermined energy, and then discharges the energy instantaneously. Reference numeral 2 denotes a drive shaft directly connected to the output shaft of the energy accumulator 1. The drive shaft 2 is provided with bearings in the center of the upper plate 3 and the lower plates 4 and 6 that are horizontally spaced apart from each other as appropriate. It is pivotally supported by 3a, 4a and 6a.

この駆動軸２の下部プレート４，６間に対応する軸下部には、真空バルブＨ、Ｗ1、Ｗ２を開閉するカム５が取付けられ、このカム５にはその円周方向の適宜箇所を上下方向に変位させた溝５ａ、５ｂが上下２段に形成されている。このカム５近傍の外周囲部に図５にＵ、Ｖ、Ｗで示すように３相各相に対応する真空バルブ開閉機構３０が設けられている。   A cam 5 that opens and closes the vacuum valves H, W1, and W2 is attached to the lower portion of the shaft corresponding to the lower plate 4 and 6 of the drive shaft 2, and an appropriate position in the circumferential direction of the cam 5 is set up and down. The grooves 5a and 5b displaced in the vertical direction are formed in two upper and lower stages. As shown by U, V, and W in FIG. 5, vacuum valve opening / closing mechanisms 30 corresponding to the three phases are provided on the outer peripheral portion in the vicinity of the cam 5.

この真空バルブ開閉機構部３０は、固定接点３２及び可動接点３１を有する真空バルブＨ、Ｗ１、Ｗ２が駆動軸１を中心とする円周上に等間隔を存して配置され、この真空バルブの可動接点３１には図４（ａ），（ｂ）に示したように開閉ボス２４が取付け固定されている。   In this vacuum valve opening / closing mechanism section 30, vacuum valves H, W1, W2 having a fixed contact 32 and a movable contact 31 are arranged on the circumference centered on the drive shaft 1 at equal intervals. An open / close boss 24 is attached and fixed to the movable contact 31 as shown in FIGS.

この開閉ボス２４は導通を確保するとともに、開閉動作の際には作動力を受ける役割を持っている。開閉ボス２４の内側凹所内にはワイプバネ２５が設けられ、その一端を後述する駆動ボス２０に、他端を開閉ボス２４の孔底面に当接して駆動ボス２０の動きに応じて通電に必要な接触力を可動接点３１に与えている。   The open / close boss 24 has a role of receiving conduction force during opening and closing operations while ensuring electrical continuity. A wipe spring 25 is provided in the inner recess of the opening / closing boss 24, one end of which is in contact with the driving boss 20 described later and the other end is in contact with the bottom of the hole of the opening / closing boss 24. A contact force is applied to the movable contact 31.

駆動ボス２０は、カム５に対し垂直方向に抜ける貫通孔を有し、且つカム５に対応する側面に溝５ａ，５ｂに係合するカムフォロア２１が回動自在に取付けられたもので、この駆動ボス２０はその貫通孔を通して両端部が下部プレート４，６にそれぞれ固定された２本の案内棒２９に挿通させて直進ガイド２８を介して上下動可能に設けられ、カム５の回転動作が平滑に行われるように支持されている。   The drive boss 20 has a through hole that passes through in a direction perpendicular to the cam 5, and a cam follower 21 that engages with the grooves 5 a and 5 b is rotatably attached to a side surface corresponding to the cam 5. The boss 20 is inserted through two through-holes into two guide rods 29 having both ends fixed to the lower plates 4 and 6, respectively, so that the boss 20 can be moved up and down via a straight guide 28, and the cam 5 rotates smoothly. Is supported to be done.

また、開閉ボス２４の側面には可撓導線２３が接続され、これら可撓導線２３は図５に示すようにそれぞれ中性点リングＮＲに接続されている。   Further, flexible conducting wires 23 are connected to the side surfaces of the opening / closing boss 24, and these flexible conducting wires 23 are connected to the neutral point ring NR as shown in FIG.

一方、駆動軸２の外周部には空転機構４０と可動部５０から成る切換スイッチＳが配置されている。   On the other hand, a changeover switch S including an idling mechanism 40 and a movable portion 50 is disposed on the outer peripheral portion of the drive shaft 2.

空転機構４０は、駆動軸２に連結キー１１により固定された第１のカップリング１０と、このカップリング１０と空転動作を行わせる第２のカップリング５１とを備えている。第１のカップリング１０は、図６に示すように凸部を有している。また、第２のカップリング５１は、第１のカップリング１０と同軸的に設けられ、且つ絶縁軸５３に固定された従動側となるもので、この第２のカップリング５１は、第１のカップリング１０の凸部が係合する第１の凹溝５１ａを有し、この第１の凹溝５１ａと第１のカップリング１０の凸部間には空転角度θが設けられ、この空転角度θによる遅れ動作によって主バルブＨの遮断から切換スイッチＳの導通が離れるまでの時間を大きく取ることが可能になっている。   The idling mechanism 40 includes a first coupling 10 that is fixed to the drive shaft 2 by the connecting key 11, and a second coupling 51 that performs idling with the coupling 10. The first coupling 10 has a convex portion as shown in FIG. The second coupling 51 is provided coaxially with the first coupling 10 and is a driven side fixed to the insulating shaft 53. The second coupling 51 A first concave groove 51a with which the convex portion of the coupling 10 engages is provided, and an idle angle θ is provided between the first concave groove 51a and the convex portion of the first coupling 10, and this idle angle is determined. Due to the delayed operation by θ, it is possible to take a long time from the disconnection of the main valve H to the disconnection of the changeover switch S.

また、可動部５０は、図７、図８に示すように空転機構４０の第２のカップリング５１と連結された絶縁軸５３と、この絶縁軸５３の周面に３相各相に対応させて取付けられた集電リングＳ０と、主バルブＨの固定接点３２に取付けられた通電台７１に固定され、この通電台を通電路として集電リングＳ０に摺動接触するスライド接点７０と、このスライド接点７０の上方の集電リングＳ０に固定されスライド接点７０を有した可動接点ＳＭとで構成され、固定接点Ｓ１、Ｓ２を可動部５０の回動に伴って選択可能になっている。   Further, as shown in FIGS. 7 and 8, the movable portion 50 has an insulating shaft 53 connected to the second coupling 51 of the idling mechanism 40, and the peripheral surface of the insulating shaft 53 corresponds to each of the three phases. A current collecting ring S0 attached to the main valve H, and a slide contact 70 fixed to a current-carrying base 71 attached to the fixed contact 32 of the main valve H. The movable contact SM is fixed to the current collecting ring S0 above the slide contact 70 and has the slide contact 70, and the fixed contacts S1 and S2 can be selected as the movable portion 50 rotates.

さらに、中性点リングＮＲには図３及び図５に示すように接続導体ＮＢが取付けられ、接続導体ＮＢは中性点端子ＮＰに直結されている。   Further, a connection conductor NB is attached to the neutral point ring NR as shown in FIGS. 3 and 5, and the connection conductor NB is directly connected to the neutral point terminal NP.

切換スイッチＳの固定接点Ｓ１、Ｓ２は、それぞれ接点台９１、９２を介して端子Ｍ１Ｐ、Ｍ２Ｐに接続され、これら端子Ｍ１Ｐ、Ｍ２Ｐは図示していないタップ選択器のそれぞれの隣接するタップの可動接点Ｍ１、Ｍ２に接続される。   The fixed contacts S1 and S2 of the changeover switch S are connected to terminals M1P and M2P via contact bases 91 and 92, respectively. These terminals M1P and M2P are movable contacts of adjacent taps of a tap selector (not shown). Connected to M1 and M2.

上記スライド接点７０は、図９に示すように板状の銅箔を数十枚重ね合せた可撓銅箔６８をその一端の片面より接点６４を固着し、この接点６４と逆側の一端で接点６４を固着した面と同じ側面に通電座金６３を当て図７に示すように通電台７１に固定する。接点６４、通電座金６３と逆側の面には、それぞれの固定接点あるいは集電リングＳ０をスライド接点７０で挟持した状態で接触荷重が働くように板ばね６２が取付けられている。   As shown in FIG. 9, the slide contact 70 has a flexible copper foil 68 in which dozens of plate-like copper foils are overlapped, and a contact 64 is fixed from one side of one end thereof, and at one end opposite to the contact 64. An energizing washer 63 is applied to the same side as the surface to which the contact 64 is fixed, and is fixed to the energizing base 71 as shown in FIG. A leaf spring 62 is attached to the surface opposite to the contact 64 and the energizing washer 63 so that a contact load acts in a state where the fixed contact or the current collecting ring S0 is sandwiched between the slide contacts 70.

次に上記のように構成された負荷時タップ切換器の動作を図１０乃至図１８により説明する。   Next, the operation of the on-load tap changer configured as described above will be described with reference to FIGS.

図１０（ａ）はタップＴ１における正規運転状態であり、溝５ｂにより抵抗バルブＷ１が閉、抵抗バルブＷ２が開、溝５ａにより主バルブＨが閉の状態にある。図１０（ｂ）は切換を完了し、タップＴ２における正規運転状態を示し、抵抗バルブＷ１が開、抵抗バルブＷ２が閉、主バルブＨが閉の状態にある。   FIG. 10A shows a normal operation state at the tap T1, in which the resistance valve W1 is closed by the groove 5b, the resistance valve W2 is opened, and the main valve H is closed by the groove 5a. FIG. 10B shows the normal operation state at the tap T2 when the switching is completed, and the resistance valve W1 is open, the resistance valve W2 is closed, and the main valve H is closed.

このときの切換動作シーケンスは図２に示した通りである。以下その動作について図１１乃至図１８を用いて説明する。   The switching operation sequence at this time is as shown in FIG. The operation will be described below with reference to FIGS.

各図の（ａ）は図１に対応した回路図、（ｂ）はカム５と主バルブＨ、抵抗バルブＷ１、Ｗ２の動作状態、（ｃ）は切換スイッチＳの可動接点ＳＭと固定接点Ｓ１、Ｓ２の接触状態、（ｄ）は切換スイッチＳにおける通電台７１に取付けたスライド接点７０と集電リングＳ０の状態、（ｅ）は空転機構４０の動作状態を示している。   (A) of each figure is a circuit diagram corresponding to FIG. 1, (b) is an operating state of the cam 5, the main valve H, and the resistance valves W1, W2, and (c) is a movable contact SM and a fixed contact S1 of the changeover switch S. , S2 shows the contact state, (d) shows the state of the slide contact 70 and the current collecting ring S0 attached to the power supply base 71 in the changeover switch S, and (e) shows the operating state of the idling mechanism 40.

なお、各々の可動接点はスライド接点７０の可撓銅箔６１と接点６４のみを図示した。   In addition, each movable contact illustrated only the flexible copper foil 61 and the contact 64 of the slide contact 70.

図１１はタップＴ１における運転状態を示し、主バルブＨ、抵抗バルブＷ１が閉じ、抵抗バルブＷ２が開極し、切換スイッチＳの可動接点ＳＭは固定接点Ｓ１を選択している。   FIG. 11 shows the operation state at the tap T1, the main valve H and the resistance valve W1 are closed, the resistance valve W2 is opened, and the movable contact SM of the changeover switch S selects the fixed contact S1.

この状態で駆動軸２が回動すると、図１２（ｂ）に示すようにカムフォロア２１が溝５ａの傾斜面に沿って移動し、主バルブＨが開き始める。この時、切換スイッチ空転機構４０の第１のカップリング１０が回転するが、空転部５１ａにカップリング１０があるため、第２のカップリング５１は静止したままであり、切換スイッチ可動部５０の集電リングＳ０は回転せず、切換スイッチの可動接点ＳＭは固定接点Ｓ１に接触したままである（図１２（ｃ）〜（ｅ））。   When the drive shaft 2 rotates in this state, the cam follower 21 moves along the inclined surface of the groove 5a as shown in FIG. 12B, and the main valve H starts to open. At this time, the first coupling 10 of the changeover switch idling mechanism 40 rotates. However, since the idling part 51a has the coupling 10, the second coupling 51 remains stationary, and the changeover switch movable part 50 The current collecting ring S0 does not rotate, and the movable contact SM of the changeover switch remains in contact with the fixed contact S1 (FIGS. 12C to 12E).

次いで、図１３（ｂ）に示すようにカムフォロア２１が溝５ｂの傾斜面に沿って移動し、抵抗バルブＷ２が閉極し始める。このとき、主バルブＨのカムフォロア２１は傾斜をくだりきって、水平面を移動し、主バルブＨは完全に開極する。また、切換スイッチ空転機構４０の第１のカップリング１０と第２のカップリング５１が契合し、絶縁軸５３を介して切換スイッチの可動部の集電リングＳ０を介して可動接点ＳＭとが回動を行う（図１３（ｃ）〜（ｅ））。   Next, as shown in FIG. 13B, the cam follower 21 moves along the inclined surface of the groove 5b, and the resistance valve W2 starts to close. At this time, the cam follower 21 of the main valve H is completely inclined and moves in a horizontal plane, and the main valve H is completely opened. Further, the first coupling 10 and the second coupling 51 of the changeover switch idling mechanism 40 are engaged, and the movable contact SM is rotated via the insulating shaft 53 via the current collecting ring S0 of the movable part of the changeover switch. The movement is performed (FIGS. 13C to 13E).

駆動軸２の回転が続き、図１４（ｂ）に示すように抵抗バルブＷ２のカムフォロア２１が溝５ｂの傾斜を登りきると、図１４（ｃ）のように切換スイッチの可動接点ＳＭは固定接点Ｓ１から離れる。   When the rotation of the drive shaft 2 continues and the cam follower 21 of the resistance valve W2 climbs up the inclination of the groove 5b as shown in FIG. 14 (b), the movable contact SM of the changeover switch becomes the fixed contact S1 as shown in FIG. 14 (c). Get away from.

その後、図１５（ｂ）に示すように真空バルブＶ２のカムフォロア２１が溝５ｂの傾斜をくだり、抵抗バルブＷ１が開極する。このとき、主バルブＨは開、抵抗バルブＷ２は閉の状態にある。   Thereafter, as shown in FIG. 15B, the cam follower 21 of the vacuum valve V2 tilts the groove 5b, and the resistance valve W1 opens. At this time, the main valve H is open and the resistance valve W2 is closed.

次に切換スイッチの可動接点ＳＭが固定接点Ｓ２と接触する（図１６（ｃ））。このとき、主バルブＨは開、抵抗バルブＷ１は開、抵抗バルブＷ２が閉の状態にある（図１６（ｂ））。   Next, the movable contact SM of the changeover switch comes into contact with the fixed contact S2 (FIG. 16C). At this time, the main valve H is open, the resistance valve W1 is open, and the resistance valve W2 is closed (FIG. 16B).

さらに、駆動軸２がカム５を回転させると、主バルブＨのカムフォロア２１はカム溝５aの傾斜を登り、閉極する（図１７（ｂ））。このとき、切換スイッチの可動接点ＳＭは完全に固定接点Ｓ２と接触している（図１７（ｃ））。   Further, when the drive shaft 2 rotates the cam 5, the cam follower 21 of the main valve H climbs the slope of the cam groove 5a and closes the pole (FIG. 17 (b)). At this time, the movable contact SM of the changeover switch is completely in contact with the fixed contact S2 (FIG. 17C).

切換が完了し、タップＴ２による運転状態となる（図１８（ａ））。このとき、主バルブＨは閉、抵抗バルブＷ１は開、抵抗バルブＷ２は閉の状態である（図１８（ｂ））。   The switching is completed, and the operation state by the tap T2 is entered (FIG. 18 (a)). At this time, the main valve H is closed, the resistance valve W1 is opened, and the resistance valve W2 is closed (FIG. 18B).

以上の説明はタップＴ１からＴ２への切換動作であるが、タップＴ２からＴ１への切換は前述と逆動作となるだけなので、ここではその説明を省略する。   The above description is the switching operation from the tap T1 to T2, but the switching from the tap T2 to T1 is only the reverse operation to that described above, so the description thereof is omitted here.

このように本発明の第１の実施形態では、真空バルブの開閉機構３０は真空バルブに開閉動作を伝達するカム５を中心にその外周に３相各相に対応する真空バルブを円周方向に等間隔に配置し、カム５の真上に切換スイッチＳを、その回転部を駆動軸に同軸的に取付ける構成としたので、デッドスペースを有効に活用でき、コンパクトな配置が可能であるとともに、駆動軸２と、カム５、切換スイッチＳすべてを同軸で駆動するため、複雑な機構とならずに２抵抗３バルブ切換方式の安定した切換シーケンスを得ることができる。   As described above, in the first embodiment of the present invention, the vacuum valve opening / closing mechanism 30 has the cam 5 for transmitting the opening / closing operation to the vacuum valve as a center, and the vacuum valves corresponding to the three phases on the outer periphery thereof in the circumferential direction. Since the changeover switch S is arranged at equal intervals and the rotation switch S is coaxially mounted on the drive shaft directly above the cam 5, the dead space can be effectively utilized and a compact arrangement is possible. Since the drive shaft 2, the cam 5, and the selector switch S are all driven coaxially, a stable switching sequence of the two-resistance three-valve switching system can be obtained without using a complicated mechanism.

また、カム５を駆動軸２の下端に配置し、その上方に真空バルブ、切換スイッチＳを配置することにより、タップ選択器のそれぞれの隣接するタップの可動接点Ｍ１、Ｍ２に接続される端子Ｍ１Ｐ、Ｍ２Ｐを上方に配置することができる。   Further, by disposing the cam 5 at the lower end of the drive shaft 2 and arranging the vacuum valve and the changeover switch S thereabove, terminals M1P connected to the movable contacts M1 and M2 of the adjacent taps of the tap selector. , M2P can be placed above.

ところで、上記端子Ｍ１Ｐ、Ｍ２Ｐはワイプばね等により、切換開閉器を変圧器と隔離した容器に設けた固定接点に半径方向に接圧され、容器固定接点を介してタップ選択器の可動接点Ｍ１、Ｍ２と接続する場合がある。   By the way, the terminals M1P and M2P are contacted in a radial direction by a wipe spring or the like to a fixed contact provided on a container having a switching switch isolated from the transformer, and the movable contact M1 of the tap selector via the container fixed contact. May connect to M2.

通常、切換開閉器は容器上部に設けたフランジに吊り下げ固定するため、切換開閉器を斜めに取付けした場合、端子Ｍ１Ｐ、Ｍ２Ｐに十分なワイプ量、荷重を与えないと端子Ｍ１Ｐ、Ｍ２Ｐと容器固定接点が不完全接触となる可能性がある。   Usually, since the switching switch is suspended and fixed to a flange provided on the upper part of the container, when the switching switch is mounted obliquely, the terminals M1P and M2P and the container must be provided unless a sufficient wipe amount and load are applied to the terminals M1P and M2P. Fixed contact may be incomplete.

したがって、上記のように端子Ｍ１Ｐ、Ｍ２Ｐが上下方向位置で切換開閉器を固定する容器上部から近いところに位置しているので、この影響を受けにくくなるというメリットがある。   Therefore, as described above, since the terminals M1P and M2P are located close to the upper part of the container that fixes the switching switch at the vertical position, there is an advantage that it is less susceptible to this influence.

本発明における切換開閉器では端子Ｍ１Ｐ、Ｍ２Ｐを上方に配置することができるため、切換開閉器が斜めになることによる不完全接触の影響を軽減でき、安定した通電ができる。   In the switching switch according to the present invention, since the terminals M1P and M2P can be arranged on the upper side, the influence of incomplete contact due to the switching switch being inclined can be reduced and stable energization can be performed.

以上のことから本発明の第１の実施形態によれば、２抵抗３バルブ切換方式を用いた安定した切換動作と通電を実現するコンパクトな切換開閉器を提供することができる。   From the above, according to the first embodiment of the present invention, it is possible to provide a compact switching switch that realizes stable switching operation and energization using the 2-resistance 3-valve switching system.

（第２の実施形態）
図１９は、本発明の第２の実施形態である２抵抗３バルブ切換方式を用いた切換開閉器の切換回路図である。また、図２０はその切換シーケンスを示す図である。 (Second Embodiment)
FIG. 19 is a switching circuit diagram of a switching switch using the two-resistance three-valve switching method according to the second embodiment of the present invention. FIG. 20 is a diagram showing the switching sequence.

図１９において、ＴＷはタップ巻線を示し、タップ選択器の可動接点Ｍ１、Ｍ２がタップ間に接続されている。この可動接点Ｍ１、Ｍ２と中性点Ｎの間には、可動接点Ｍ１、Ｍ２それぞれに限流抵抗Ｒ１と抵抗バルブＷ１、および限流抵抗Ｒ２と抵抗バルブＷ２が直列に接続され、その一端は中性点Ｎで接続されている。   In FIG. 19, TW indicates a tap winding, and the movable contacts M1 and M2 of the tap selector are connected between the taps. Between the movable contacts M1 and M2 and the neutral point N, a current limiting resistor R1 and a resistance valve W1, and a current limiting resistor R2 and a resistance valve W2 are connected in series to the movable contacts M1 and M2, respectively. Connected at neutral point N.

主バルブＨは、可動接点Ｍ１と限流抵抗Ｒ１の間に設けた固定接点Ｓ１と可動接点Ｍ２と限流抵抗Ｒ２の間に設けた固定接点Ｓ２のいずれか一方を選択する可動接点ＳＭと接続され、主バルブＨの一端は中性点Ｎに接続されている。   The main valve H is connected to a movable contact SM for selecting one of a fixed contact S1 provided between the movable contact M1 and the current limiting resistor R1, and a fixed contact S2 provided between the movable contact M2 and the current limiting resistor R2. One end of the main valve H is connected to the neutral point N.

また、中性点Ｎには、可動接点Ｍ１と限流抵抗Ｒ１の間に通電接点ＣＳの固定接点ＣＳ１と、可動接点Ｍ２と限流抵抗Ｒ２の間に通電接点ＣＳの固定接点ＣＳ２のいずれか一方を選択的に接続を可能にした通電接点ＣＳの可動接点ＣＳＭが接続されている。   Further, the neutral point N is either the fixed contact CS1 of the energizing contact CS between the movable contact M1 and the current limiting resistor R1, or the fixed contact CS2 of the energizing contact CS between the movable contact M2 and the current limiting resistor R2. The movable contact CSM of the energization contact CS that allows one to be selectively connected is connected.

図１９は図２０（ａ）に（イ）〜(リ)で示した切換過程を順に追って示したものである。以下その切換動作について説明する。   FIG. 19 shows the switching process shown in (a) to (b) in FIG. The switching operation will be described below.

いま、(イ)に示すように主バルブＨおよび抵抗バルブＷ１は閉極し、切換スイッチＳの可動接点ＳＭが固定接点Ｓ１に接続され、通電接点ＣＳの可動接点ＣＳＭが固定接点ＣＳ１に接続され、タップ選択器Ｍ１がタップ巻線に接続された運転状態にあるものとする。このとき、負荷電流ＩＬは、点線のように中性点Ｎから主バルブＨ、切換スイッチＳの可動接点ＳＭ、固定接点Ｓ１、タップ巻線ＴＷという回路と、中性点Ｎから通電接点そとの可動接点ＣＳＭ、固定接点ＣＳ１、タップ巻線ＴＷという回路に分流する。   As shown in (a), the main valve H and the resistance valve W1 are closed, the movable contact SM of the changeover switch S is connected to the fixed contact S1, and the movable contact CSM of the energizing contact CS is connected to the fixed contact CS1. It is assumed that the tap selector M1 is in an operating state connected to the tap winding. At this time, the load current IL is changed from the neutral point N to the main valve H, the movable contact SM of the changeover switch S, the fixed contact S1, the tap winding TW, and the neutral point N to the energized contact point. The circuit is divided into a movable contact CSM, a fixed contact CS1, and a tap winding TW.

この状態から切換動作が開始すると、まず（ロ）に示すように通電接点ＣＳの可動接点ＣＳＭが固定接点ＣＳ１から開離する。このとき負荷電流ＩＬは点線のように中性点Ｎから主バルブＨ、切換スイッチＳの可動接点ＳＭ、固定接点Ｓ１、タップ巻線ＴＷという回路に流れる。   When the switching operation starts from this state, first, the movable contact CSM of the energizing contact CS is separated from the fixed contact CS1, as shown in (b). At this time, the load current IL flows from the neutral point N to the circuit of the main valve H, the movable contact SM of the changeover switch S, the fixed contact S1, and the tap winding TW as indicated by the dotted line.

次に（ハ）に示すように主バルブＨが開く。このとき、負荷電流ＩＬは、点線のように抵抗バルブＷ１、限流抵抗Ｒ１、タップ巻線ＴＷという回路に流れる。   Next, as shown in (c), the main valve H is opened. At this time, the load current IL flows through a circuit including a resistance valve W1, a current limiting resistor R1, and a tap winding TW as indicated by a dotted line.

続いて、抵抗バルブＷ２が閉極すると、(ニ)に示すように限流抵抗Ｒ２、抵抗バルブＷ２、抵抗バルブＷ１、限流抵抗Ｒ１を介して短絡回路が形成され、循環電流ＩＣが流れる。また、負荷電流ＩＬは中性点から、抵抗バルブＷ１、限流抵抗Ｒ１の回路と抵抗バルブＷ２、限流抵抗Ｒ２の回路に、限流抵抗Ｒ１、Ｒ２の抵抗比に見合って分流する。   Subsequently, when the resistance valve W2 is closed, a short circuit is formed through the current limiting resistor R2, the resistance valve W2, the resistance valve W1, and the current limiting resistor R1 as shown in FIG. Further, the load current IL is diverted from the neutral point to the circuit of the resistance valve W1 and the current limiting resistor R1 and the circuit of the resistance valve W2 and the current limiting resistor R2 in accordance with the resistance ratio of the current limiting resistors R1 and R2.

その後、切換スイッチＳの可動接点ＳＭが（ホ）に示すように固定接点Ｓ１から固定接点Ｓ２へと移動を開始する。   Thereafter, the movable contact SM of the changeover switch S starts to move from the fixed contact S1 to the fixed contact S2 as shown in (e).

次いで、（ヘ）に示すように抵抗バルブＷ１が開極する。このとき、負荷電流ＩＬは、点線のように抵抗バルブＷ２、限流抵抗Ｒ２、タップ巻線ＴＷという回路に流れる。   Next, the resistance valve W1 is opened as shown in FIG. At this time, the load current IL flows through a circuit of the resistance valve W2, the current limiting resistor R2, and the tap winding TW as indicated by a dotted line.

そして、切換スイッチＳの可動接点ＳＭが(ト)に示すように固定接点Ｓ２へと移動を完了する。   Then, the movable contact SM of the changeover switch S completes the movement to the fixed contact S2 as shown in FIG.

次に（チ）に示すように主バルブＨが閉極し、負荷電流ＩＬを中性点Ｎから主バルブＨ、切換スイッチＳの可動接点ＳＭ、固定接点Ｓ２、タップ巻線ＴＷという回路に移る。   Next, as shown in (h), the main valve H is closed, and the load current IL is transferred from the neutral point N to the circuit of the main valve H, the movable contact SM of the changeover switch S, the fixed contact S2, and the tap winding TW. .

最後に（リ）に示すように通電接点ＣＳの可動接点ＣＳＭが固定接点ＣＳ２に接続され、負荷電流ＩＬは、点線のように中性点Ｎから主バルブＨ、切換スイッチＳの可動接点ＳＭ、固定接点Ｓ２、タップ巻線ＴＷという回路と、中性点Ｎから通電接点ＣＳの可動接点ＣＳＭ、接点ＣＳ２、タップ巻線ＴＷという回路に分流する。   Finally, as shown in (i), the movable contact CSM of the energizing contact CS is connected to the fixed contact CS2, and the load current IL is moved from the neutral point N to the main valve H, the movable contact SM of the changeover switch S, The circuit is divided into a circuit of a fixed contact S2 and a tap winding TW and a circuit of a movable contact CSM, a contact CS2 and a tap winding TW of the energizing contact CS from the neutral point N.

これで、切換動作を完了し、図示の状態で運転を継続する。   Thus, the switching operation is completed and the operation is continued in the state shown in the drawing.

また、次のタップへの切換動作は図２０（ｂ）に示す(リ)から(イ)への順で行われる。   Further, the switching operation to the next tap is performed in the order from (i) to (a) shown in FIG.

この切換方式では、タップ選択器の可動接点Ｍ１、Ｍ２にそれぞれに限流抵抗Ｒ１と限流抵抗Ｒ２が接続されているため、真空バルブ極間に過電圧が印加されても、常に限流抵抗Ｒ１あるいはＲ２を介してタップ間短絡回路を形成することになり、真空バルブの接点間の耐電圧保護装置を必要としない。   In this switching method, the current limiting resistor R1 and the current limiting resistor R2 are connected to the movable contacts M1 and M2 of the tap selector, respectively. Therefore, even if an overvoltage is applied between the vacuum valve electrodes, the current limiting resistor R1 is always applied. Or the short circuit between taps will be formed via R2, and the withstand voltage protection apparatus between the contacts of a vacuum valve is not required.

また、遮断回数の多い主バルブＨの遮断電流の最大値は負荷電流ＩＬであり、主バルブの遮断電流の最大値を抑えることができる。万が一、図１９（ハ）の状態において、主バルブＨの遮断失敗が生じても、切換スイッチＳにより強制的に回路を開くことができるので、切換スイッチＳにおいて電流遮断が可能となり、信頼性の高い切換能力を有している。   Further, the maximum value of the cutoff current of the main valve H having a large number of cutoffs is the load current IL, and the maximum value of the cutoff current of the main valve can be suppressed. In the state of FIG. 19 (c), even if the main valve H fails to shut off, the circuit can be forcibly opened by the changeover switch S. Therefore, the current can be cut off at the changeover switch S, and the reliability can be improved. High switching ability.

さらに、上述したように、通電接点ＣＳを設けることにより、常時の運転状態（図１９（イ）あるいは（リ））で負荷電流ＩＬが通電接点ＣＳの固定接点ＣＳ１と主バルブＨあるいは通電接点ＣＳの固定接点ＣＳ２と主バルブＨに分流する。主バルブＨのみで負荷電流ＩＬを通電する場合、通電状態における温度上昇を抑えるため、主バルブＨの電極間の接触荷重を大きくし、電極間での接触抵抗を小さくする必要がある。   Further, as described above, by providing the energizing contact CS, the load current IL is changed between the fixed contact CS1 of the energizing contact CS and the main valve H or the energizing contact CS in a normal operation state (FIG. 19 (A) or (R)). To the fixed contact CS2 and the main valve H. When the load current IL is applied only by the main valve H, it is necessary to increase the contact load between the electrodes of the main valve H and reduce the contact resistance between the electrodes in order to suppress the temperature rise in the energized state.

常時の運転状態（図１９（イ）あるいは（リ））における負荷電流ＩＬを通電接点ＣＳの固定接点ＣＳ１と主バルブＨあるいは通電接点ＣＳの固定接点ＣＳ２と主バルブＨに分流できれば、主バルブの接触荷重および通電接点における接点接触荷重を低く抑えることができるため、切換開閉器の駆動機構部が簡素化できる。また、主バルブＨには通電能力を無視し、遮断能力が優れた真空バルブを採用することができる。   If the load current IL in the normal operation state (FIG. 19 (A) or (R)) can be diverted between the fixed contact CS1 of the energizing contact CS and the main valve H or the fixed contact CS2 of the energized contact CS and the main valve H, Since the contact load and the contact load at the energized contact can be kept low, the drive mechanism of the switching switch can be simplified. In addition, the main valve H can be a vacuum valve that ignores the current-carrying ability and has an excellent shut-off ability.

次に本発明による２抵抗３バルブ切換方式を用いた負荷時タップ切換器の第２の実施形態について図２１及び図２２を用いて述べるに、図３と同一部分には同一符号を付してその説明を省略し、ここでは異なる部分の構成について説明する。   Next, a second embodiment of the on-load tap changer using the two-resistor three-valve switching method according to the present invention will be described with reference to FIGS. 21 and 22. The same parts as those in FIG. The description thereof is omitted, and the configuration of different parts will be described here.

図２１は、２抵抗３バルブ切換方式を用いた切換開閉器の断面図、図２２は図２１におけるＥ−Ｅ線に沿う矢視断面図である。なお、図２１のＡ−Ａ線、Ｂ−Ｂ線、Ｃ−Ｃ線、Ｄ−Ｄ線に沿う矢視断面図は、第１の実施形態の図５〜図８と同じなので、これらの図示は省略する。また、真空バルブ開閉機構の拡大図は図４と、各可動接点に用いるスライド接点の詳細図も図９と同じなのでこれらの図示も省略する。   FIG. 21 is a cross-sectional view of a switching switch using a 2-resistance 3-valve switching system, and FIG. 22 is a cross-sectional view taken along the line EE in FIG. 21 is the same as FIGS. 5 to 8 of the first embodiment, and the cross-sectional views taken along the lines AA, BB, CC, and DD in FIG. Is omitted. The enlarged view of the vacuum valve opening / closing mechanism is the same as FIG. 4 and the detailed view of the slide contact used for each movable contact is the same as FIG.

第２の実施形態では、図２１に示すように可動部５０より上方の駆動軸２に通電接点の可動部８０を連結キー１２により固定し、この通電接点の可動部８０と図５に示すように中性点リングＮＲに電気的に通電可能に取付けられた接続導体ＮＢに中性点端子ＮＰと共に直結され、且つ上部プレート３の下面に取付けた中性点接点台Ｎ１とを図２２に示すように可撓導線１２３により接続する。   In the second embodiment, as shown in FIG. 21, a movable portion 80 of the energizing contact is fixed to the drive shaft 2 above the movable portion 50 by the connecting key 12, and the movable portion 80 of the energized contact and the movable portion 80 are shown in FIG. FIG. 22 shows a neutral point contact base N1 directly connected to the connection conductor NB attached to the neutral point ring NR so as to be electrically energized together with the neutral point terminal NP and attached to the lower surface of the upper plate 3. As shown in FIG.

この通電接点の可動部８０は、図９と同様の構成のスライド接点７０を有する可動接点ＣＳＭを備え、この可動接点ＣＳＭの回動に伴い、接点台９１，９２の下面に取付けられた切換スイッチＳの固定接点Ｓ１，Ｓ２と平行に接点台９１，９２の上面に取付けられた通電接点ＣＳの固定接点ＣＳ１，ＣＳ２を選択可能になっている。   The movable portion 80 of the energizing contact includes a movable contact CSM having a slide contact 70 having the same configuration as that shown in FIG. 9, and a change-over switch attached to the lower surfaces of the contact bases 91 and 92 as the movable contact CSM rotates. The fixed contacts CS1 and CS2 of the energizing contact CS attached to the upper surfaces of the contact bases 91 and 92 in parallel with the S fixed contacts S1 and S2 can be selected.

これら切換スイッチＳ及び通電接点ＣＳの固定接点Ｓ１とＣＳ１、Ｓ２とＣＳ２は、それぞれ接点台９１、９２を介して端子Ｍ１Ｐ、Ｍ２Ｐに接続され、端子Ｍ１Ｐ、Ｍ２Ｐは図示していないタップ選択器のそれぞれの隣接するタップの可動接点Ｍ１、Ｍ２に接続される。   The changeover switch S and the fixed contacts S1 and CS1, and S2 and CS2 of the energizing contact CS are connected to terminals M1P and M2P via contact bases 91 and 92, respectively, and the terminals M1P and M2P are not shown in the drawing of a tap selector. Connected to the movable contacts M1 and M2 of each adjacent tap.

次に上記のように構成された負荷時タップ切換器の動作を図２３から図３２により説明する。   Next, the operation of the on-load tap changer configured as described above will be described with reference to FIGS.

図２３（ａ）はタップＴ１における正規運転状態であり、カム溝５ｂにより抵抗バルブＷ１が閉、抵抗バルブＷ２が開、カム溝５ａにより主バルブＨが閉の状態にある。図２３（ｂ）は切換を完了し、タップＴ２における正規運転状態を示し、抵抗バルブＷ１が開、抵抗バルブＷ２が閉、主バルブＨが閉の状態にある。   FIG. 23A shows a normal operation state at the tap T1, where the resistance valve W1 is closed by the cam groove 5b, the resistance valve W2 is opened, and the main valve H is closed by the cam groove 5a. FIG. 23B shows the normal operation state at the tap T2 when the switching is completed, and the resistance valve W1 is open, the resistance valve W2 is closed, and the main valve H is closed.

このときの切換動作シーケンスは図２０に示した通りである。   The switching operation sequence at this time is as shown in FIG.

以下その動作について図２４から図３２を用いて説明する。   The operation will be described below with reference to FIGS.

各図の（ａ）は図１に対応した回路図、（ｂ）はカム５と主バルブＨ、抵抗バルブＷ１、Ｗ２の動作状態、（ｃ）は通電接点ＣＳにおける可動接点ＣＳＭの動作状態、（ｄ）は切換スイッチＳの可動接点ＳＭと固定接点Ｓ１、Ｓ２の接触状態、（e）は切換スイッチＳにおける通電台７１に取付けたスライド接点７０と集電リングＳ０の状態、（f）は空転機構４０の動作状態を示している。   (A) of each figure is a circuit diagram corresponding to FIG. 1, (b) is an operating state of the cam 5, the main valve H, and the resistance valves W1, W2, (c) is an operating state of the movable contact CSM in the energizing contact CS, (D) is the contact state of the movable contact SM of the changeover switch S and the fixed contacts S1 and S2, (e) is the state of the slide contact 70 attached to the current-carrying base 71 in the changeover switch S and the current collecting ring S0, and (f) is the state of (f) The operating state of the idling mechanism 40 is shown.

なお、ここでは見やすいように、可撓導線１２３は図示せず、また、各々の可動接点はスライド接点７０の可撓銅箔６１と接点６４のみを図示した。   Here, for the sake of easy understanding, the flexible conductor 123 is not shown, and only the flexible copper foil 61 and the contact 64 of the slide contact 70 are shown as the movable contacts.

図２４はタップＴ１における運転状態を示し、主バルブＨ、抵抗バルブＷ１が閉じ、抵抗バルブＷ２が開極し、切換スイッチＳの可動接点ＳＭは固定接点Ｓ１を選択し、通電接点ＣＳの可動接点ＣＳＭは固定接点ＣＳ１を選択している。   FIG. 24 shows the operation state at the tap T1, the main valve H and the resistance valve W1 are closed, the resistance valve W2 is opened, the movable contact SM of the changeover switch S selects the fixed contact S1, and the movable contact of the energizing contact CS. The CSM selects the fixed contact CS1.

この状態で駆動軸２が回動すると、通電接点ＣＳの可動接点ＣＳＭが固定接点ＣＳ１から開離する（図２５（ｃ））。これと同時にカム５も回転を始めるが、カム溝５ａの水平面にカムフォロア２１があるため、真空バルブの電極はまだ動かないままである（図２５（ｂ））。   When the drive shaft 2 rotates in this state, the movable contact CSM of the energization contact CS is separated from the fixed contact CS1 (FIG. 25 (c)). At the same time, the cam 5 starts to rotate, but the electrode of the vacuum valve still does not move because the cam follower 21 is in the horizontal plane of the cam groove 5a (FIG. 25B).

この時、切換スイッチ空転機構４０の第１のカップリング１０が回転するが、空転部５１ａにカップリング１０があるため、第２のカップリング５１は静止したままであり、切換スイッチＳの可動部５０の集電リングＳ０は回転せず、切換スイッチＳの可動接点ＳＭは固定接点Ｓ１に接触したままである（図２５（ｄ）〜（ｆ））。   At this time, the first coupling 10 of the changeover switch idling mechanism 40 rotates. However, since the idling part 51a has the coupling 10, the second coupling 51 remains stationary, and the movable part of the changeover switch S is moved. The 50 current collecting ring S0 does not rotate, and the movable contact SM of the changeover switch S remains in contact with the fixed contact S1 (FIGS. 25D to 25F).

駆動軸２がさらに回転すると、図２６（ｂ）に示すようにカムフォロア２１がカム溝５ａの傾斜面に沿って移動し、主バルブＨが開き始める。このとき、通電接点ＣＳの可動接点ＣＳＭは図２６（ｃ）に示すように固定接点ＣＳ１から完全に開離している。また、空転機構４０のカップリング１０はまだ空転部５１ａにあるため、第２のカップリング５１は静止したままである（図２６（ｆ））。   When the drive shaft 2 further rotates, as shown in FIG. 26B, the cam follower 21 moves along the inclined surface of the cam groove 5a, and the main valve H starts to open. At this time, the movable contact CSM of the energizing contact CS is completely separated from the fixed contact CS1 as shown in FIG. Further, since the coupling 10 of the idling mechanism 40 is still in the idling portion 51a, the second coupling 51 remains stationary (FIG. 26 (f)).

次いで、図２７（ｂ）に示すようにカムフォロア２１がカム溝５ｂの傾斜面に沿って移動すると、抵抗バルブＷ２が閉極し始める。このとき、主バルブＨのカムフォロア２１は傾斜を下りきって、水平面に移動し、主バルブＨは完全に開極する。また、切換スイッチ空転機構４０の第１のカップリング１０と第２のカップリング５１が係合し、絶縁軸５３及び切換スイッチＳの可動部の集電リングＳ０を介して可動接点ＳＭが回動を行う（図２７（ｄ）〜（ｆ））。   Next, as shown in FIG. 27B, when the cam follower 21 moves along the inclined surface of the cam groove 5b, the resistance valve W2 starts to close. At this time, the cam follower 21 of the main valve H completely moves down to the horizontal plane, and the main valve H is completely opened. Further, the first coupling 10 and the second coupling 51 of the changeover switch idling mechanism 40 are engaged, and the movable contact SM rotates through the insulating shaft 53 and the current collecting ring S0 of the movable portion of the changeover switch S. (FIGS. 27D to 27F).

駆動軸２の回転が続き、図２８（ｂ）に示すように抵抗バルブＷ２のカムフォロア２１が溝５ｂの傾斜を登りきると、図２８（ｄ）のように切換スイッチＳの可動接点ＳＭは固定接点Ｓ１から離れる。   When the drive shaft 2 continues to rotate and the cam follower 21 of the resistance valve W2 climbs up the inclination of the groove 5b as shown in FIG. 28 (b), the movable contact SM of the changeover switch S becomes a fixed contact as shown in FIG. 28 (d). Leave S1.

その後、図２９（ｂ）に示すように真空バルブＶ２のカムフォロア２１が溝５ｂの傾斜を下り、抵抗バルブＷ１が開極する。このとき、主バルブＨは開、抵抗バルブＷ２は閉の状態にある。   Thereafter, as shown in FIG. 29B, the cam follower 21 of the vacuum valve V2 descends the inclination of the groove 5b, and the resistance valve W1 opens. At this time, the main valve H is open and the resistance valve W2 is closed.

次に切換スイッチＳの可動接点ＳＭが固定接点Ｓ２と接触する（図３０（ｄ））。このとき、主バルブＨは開、抵抗バルブＷ１は開、抵抗バルブＷ２が閉の状態にある（図３０（ｂ））。   Next, the movable contact SM of the changeover switch S comes into contact with the fixed contact S2 (FIG. 30 (d)). At this time, the main valve H is open, the resistance valve W1 is open, and the resistance valve W2 is closed (FIG. 30B).

さらに、駆動軸２がカム５を回転させると、主バルブＨのカムフォロア２１はカム溝５ａの傾斜を登り、閉極する（図３１（ａ））。このとき、切換スイッチの可動接点ＳＭは完全に固定接点Ｓ２と接触しているが、通電接点ＣＳの可動接点ＣＳＭはまだ固定接点ＣＳ２に接触していない状態にある（図３１（ｃ）、（ｄ））。   Further, when the drive shaft 2 rotates the cam 5, the cam follower 21 of the main valve H climbs the slope of the cam groove 5a and closes the pole (FIG. 31 (a)). At this time, the movable contact SM of the changeover switch is completely in contact with the fixed contact S2, but the movable contact CSM of the energizing contact CS is not yet in contact with the fixed contact CS2 (FIG. 31 (c), ( d)).

さらに、駆動軸２の回転が進むと、通電接点ＣＳの可動接点ＣＳＭが完全に固定接点ＣＳ２と接触状態になり、切換が完了し、タップＴ２による運転状態となる（図３２（ｃ））。このとき、主バルブＨは閉、抵抗バルブＷ１は開、抵抗バルブＷ２は閉の状態である（図３２（ｂ））。   Further, when the rotation of the drive shaft 2 proceeds, the movable contact CSM of the energization contact CS is completely brought into contact with the fixed contact CS2, the switching is completed, and the operation state by the tap T2 is entered (FIG. 32 (c)). At this time, the main valve H is closed, the resistance valve W1 is open, and the resistance valve W2 is closed (FIG. 32B).

以上の説明はタップＴ１からＴ２への切換動作であるが、タップＴ２からＴ１への切換は前述と逆動作となるだけなので、ここではその説明を省略する。   The above description is the switching operation from the tap T1 to T2, but the switching from the tap T2 to T1 is only the reverse operation to that described above, so the description thereof is omitted here.

また、ここでは通電接点ＣＳの可動部８０は中性点端子ＮＰと中性点接点台Ｎ１に可撓導線１２３を介して接続しているが、スライド接点で接続することも可能であることは言うまでもない。   Further, here, the movable portion 80 of the energizing contact CS is connected to the neutral point terminal NP and the neutral point contact base N1 via the flexible lead 123, but it is also possible to connect with a slide contact. Needless to say.

このように本発明の第２の実施形態では、真空バルブの開閉機構３０は、真空バルブに開閉動作を伝達するカム５を中心にその外周に３相各相に対応する真空バルブを円周方向に等間隔に配置し、カム５の真上に切換スイッチＳを、さらにその上方に通電接点ＣＳを、その各々の回転部を駆動軸に同軸的に取付ける構成としたので、デッドスペースを有効に活用でき、コンパクトな配置が可能であるとともに、駆動軸２と、カム５、切換スイッチＳ及び通電接点ＣＳのすべてを同軸で駆動しているので、複雑な機構とならずに２抵抗３バルブ切換方式の安定した切換シーケンスを得ることができる。   As described above, in the second embodiment of the present invention, the vacuum valve opening / closing mechanism 30 has the cam 5 that transmits the opening / closing operation to the vacuum valve as a center, and the vacuum valve corresponding to each of the three phases on the outer periphery thereof. Are arranged at equal intervals, the changeover switch S is directly above the cam 5, the energizing contact CS is further above the switch 5, and each rotating part is coaxially attached to the drive shaft. It can be used in a compact arrangement, and the drive shaft 2, cam 5, changeover switch S, and energizing contact CS are all driven coaxially, so there is no complicated mechanism and 2 resistance 3 valve switching is possible. A stable switching sequence of the system can be obtained.

また、カム５を駆動軸２の下端に配置し、その上方に真空バルブ、切換スイッチＳ、通電接点ＣＳを配置することにより、タップ選択器のそれぞれの隣接するタップの可動接点Ｍ１、Ｍ２に接続される端子Ｍ１Ｐ、Ｍ２Ｐを上方に配置することができる。   Further, the cam 5 is disposed at the lower end of the drive shaft 2 and the vacuum valve, the changeover switch S, and the energizing contact CS are disposed above the cam 5, thereby connecting to the movable contacts M1 and M2 of the adjacent taps of the tap selector. Terminals M1P and M2P to be operated can be arranged on the upper side.

ところで、端子Ｍ１Ｐ、Ｍ２Ｐはワイプばね等により、切換開閉器を変圧器と隔離した容器に設けた固定接点に半径方向に接圧され、容器側の固定接点を介してタップ選択器の可動接点Ｍ１、Ｍ２と接続する場合がある。   By the way, the terminals M1P and M2P are contacted in a radial direction by a wipe spring or the like to a fixed contact provided on a container having a switching switch isolated from the transformer, and the movable contact M1 of the tap selector via the fixed contact on the container side. , M2 may be connected.

通常、切換開閉器は容器上部に設けたフランジに吊り下げ固定するため、切換開閉器を斜めに取付けた場合、端子Ｍ１Ｐ、Ｍ２Ｐに十分なワイプ量、荷重を与えないと端子Ｍ１Ｐ、Ｍ２Ｐと容器側の固定接点が不完全接触となる可能性がある。   Usually, since the switching switch is suspended and fixed to a flange provided on the upper part of the container, when the switching switch is mounted obliquely, the terminals M1P and M2P and the container must be provided unless a sufficient wipe amount and load are applied to the terminals M1P and M2P. The fixed contact on the side may be incomplete contact.

しかしながら、上記のように端子Ｍ１Ｐ、Ｍ２Ｐが上下方向位置で切換開閉器を固定する容器上部から近いところに配置しているので、この影響を受けにくくなるというメリットがある。   However, as described above, since the terminals M1P and M2P are arranged close to the upper part of the container that fixes the switching switch at the vertical position, there is an advantage that it is less susceptible to this influence.

本発明における切換開閉器では、端子Ｍ１Ｐ、Ｍ２Ｐを上方に配置することができるため、切換開閉器が斜めになることによる不完全接触の影響を軽減でき、安定した通電ができる。   In the switching switch according to the present invention, since the terminals M1P and M2P can be arranged upward, the influence of incomplete contact due to the switching switch being inclined can be reduced, and stable energization can be performed.

このように本発明の第２の実施形態によれば、２抵抗３バルブ切換方式を用いた安定した通電と切換動作を実現するコンパクトな切換開閉器を提供することができる。   As described above, according to the second embodiment of the present invention, it is possible to provide a compact switching switch that realizes stable energization and switching operation using the 2-resistance 3-valve switching system.

（第３の実施形態）
図３３は、本発明の第３の実施形態である２抵抗３バルブ切換方式を用いた切換開閉器の切換回路図である。また、その切換シーケンスは図２０と同様である。 (Third embodiment)
FIG. 33 is a switching circuit diagram of a switching switch using the two-resistance three-valve switching method according to the third embodiment of the present invention. The switching sequence is the same as in FIG.

図３３において、ＴＷはタップ巻線を示し、タップ選択器の可動接点Ｍ１、Ｍ２がタップ間に接続されている。この可動接点Ｍ１、Ｍ２と３相変圧器の中性点Ｎの間には、可動接点Ｍ１、Ｍ２に限流抵抗Ｒ１と抵抗バルブＷ１、限流抵抗Ｒ２と抵抗バルブＷ２がそれぞれ直列に接続され、その一端は中性点Ｎで接続されている。   In FIG. 33, TW indicates a tap winding, and the movable contacts M1 and M2 of the tap selector are connected between the taps. Between the movable contacts M1 and M2 and the neutral point N of the three-phase transformer, a current limiting resistor R1 and a resistance valve W1, and a current limiting resistor R2 and a resistance valve W2 are connected in series to the movable contacts M1 and M2, respectively. One end thereof is connected at a neutral point N.

主バルブＨは、タップ選択器の可動接点Ｍ１と限流抵抗Ｒ１との間に設けた切換スイッチＳの固定接点Ｓ１と、タップ選択器の可動接点Ｍ２と限流抵抗Ｒ２との間に設けた切換スイッチＳの固定接点Ｓ２のいずれか一方を選択する可動接点ＳＭと接続され、主バルブＨの一端は中性点Ｎに接続されている。   The main valve H is provided between the fixed contact S1 of the changeover switch S provided between the movable contact M1 of the tap selector and the current limiting resistor R1, and between the movable contact M2 of the tap selector and the current limiting resistor R2. Connected to the movable contact SM that selects one of the fixed contacts S2 of the changeover switch S, one end of the main valve H is connected to the neutral point N.

また、タップ選択器の可動接点Ｍ１と限流抵抗Ｒ１との間に通電接点ＣＳの固定接点ＣＳ１と、タップ選択器の可動接点Ｍ２と限流抵抗Ｒ２との間に通電接点ＣＳの固定接点ＣＳ２とを設け、３つの真空バルブＨ、Ｗ１、Ｗ２と中性点Ｎとの間に設けた通電接点ＣＳの可動接点ＣＳＭにより、通電接点ＣＳの固定接点ＣＳ１と通電接点固定接点ＣＳ２のいずれか一方を選択的に接続できるようになっている。   Further, the fixed contact CS1 of the energizing contact CS between the movable contact M1 of the tap selector and the current limiting resistor R1, and the fixed contact CS2 of the energized contact CS between the movable contact M2 of the tap selector and the current limiting resistor R2. The movable contact CSM of the energizing contact CS provided between the three vacuum valves H, W1, W2 and the neutral point N, and either the fixed contact CS1 of the energizing contact CS or the energized contact fixed contact CS2 Can be selectively connected.

図３３は図２０（ａ）の（イ）〜(リ)で示した切換過程を順に追って示したものと同様である。以下その切換動作について説明する。   FIG. 33 is the same as that shown in the order of the switching processes shown in (a) to (b) of FIG. The switching operation will be described below.

いま、(イ)に示すように主バルブＨおよび抵抗バルブＷ１は閉極し、切換スイッチＳの可動接点ＳＭが固定接点Ｓ１に接続され、通電接点ＣＳの可動接点ＣＳＭが固定接点ＣＳ１に接続され、タップ選択器のタップ端子Ｍ１がタップ巻線に接続された運転状態にあるものとする。このとき、負荷電流ＩＬは、点線のように中性点Ｎから通電接点ＣＳの可動接点ＣＳＭを介して主バルブＨ、切換スイッチＳの可動接点ＳＭ、固定接点Ｓ１、タップ巻線ＴＷという回路と、中性点Ｎから通電接点ＣＳの可動接点ＣＳＭ、固定接点ＣＳ１、タップ巻線ＴＷという回路に分流する。   As shown in (a), the main valve H and the resistance valve W1 are closed, the movable contact SM of the changeover switch S is connected to the fixed contact S1, and the movable contact CSM of the energizing contact CS is connected to the fixed contact CS1. Suppose that the tap terminal M1 of the tap selector is in an operating state connected to the tap winding. At this time, the load current IL is a circuit of the main valve H, the movable contact SM of the changeover switch S, the fixed contact S1, and the tap winding TW from the neutral point N through the movable contact CSM of the energizing contact CS as shown by the dotted line. Then, the current is diverted from the neutral point N to the circuit of the movable contact CSM of the energizing contact CS, the fixed contact CS1, and the tap winding TW.

この状態から切換動作が開始すると、まず（ロ）に示すように通電接点ＣＳの可動接点ＣＳＭが固定接点ＣＳ１から開離する。このとき、負荷電流ＩＬは点線のように中性点Ｎから主バルブＨ、切換スイッチＳの可動接点ＳＭ、固定接点Ｓ１、タップ巻線ＴＷという回路に流れる。   When the switching operation starts from this state, first, the movable contact CSM of the energizing contact CS is separated from the fixed contact CS1, as shown in (b). At this time, the load current IL flows from the neutral point N to the circuit of the main valve H, the movable contact SM of the changeover switch S, the fixed contact S1, and the tap winding TW as indicated by the dotted line.

次に（ハ）に示すように主バルブＨが開く。このとき、負荷電流ＩＬは、点線のように抵抗バルブＷ１、限流抵抗Ｒ１、タップ巻線ＴＷという回路に流れる。   Next, as shown in (c), the main valve H is opened. At this time, the load current IL flows through a circuit including a resistance valve W1, a current limiting resistor R1, and a tap winding TW as indicated by a dotted line.

続いて、抵抗バルブＷ２が閉極すると、(ニ)に示すように限流抵抗Ｒ２、抵抗バルブＷ２、抵抗バルブＷ１、限流抵抗Ｒ１を介して短絡回路が形成され、循環電流ＩＣが流れる。また、負荷電流ＩＬは中性点から、抵抗バルブＷ１、限流抵抗Ｒ１の回路と抵抗バルブＷ２、限流抵抗Ｒ２の回路に限流抵抗Ｒ１、Ｒ２の抵抗比に見合って分流する。   Subsequently, when the resistance valve W2 is closed, a short circuit is formed through the current limiting resistor R2, the resistance valve W2, the resistance valve W1, and the current limiting resistor R1 as shown in FIG. Further, the load current IL is diverted from the neutral point to the circuit of the resistance valve W1 and the current limiting resistor R1 and the circuit of the resistance valve W2 and the current limiting resistor R2 in accordance with the resistance ratio of the current limiting resistors R1 and R2.

その後、切換スイッチＳの可動接点ＳＭが（ホ）に示すように固定接点Ｓ１から固定接点Ｓ２へと移動を開始する。   Thereafter, the movable contact SM of the changeover switch S starts to move from the fixed contact S1 to the fixed contact S2 as shown in (e).

次いで、(ヘ)に示すように抵抗バルブＷ１が開極する。このとき、負荷電流ＩＬは、点線のように抵抗バルブＷ２、限流抵抗Ｒ２、タップ巻線ＴＷという回路に流れる。   Next, the resistance valve W1 is opened as shown in FIG. At this time, the load current IL flows through a circuit of the resistance valve W2, the current limiting resistor R2, and the tap winding TW as indicated by a dotted line.

そして、切換スイッチＳの可動接点ＳＭが(ト)に示すように固定接点Ｓ２へと移動を完了する。   Then, the movable contact SM of the changeover switch S completes the movement to the fixed contact S2 as shown in FIG.

次に(チ)に示すように主バルブＨが閉極し、負荷電流ＩＬを中性点Ｎから主バルブＨ、切換スイッチＳの可動接点ＳＭ、固定接点Ｓ２、タップ巻線ＴＷという回路に移る。   Next, as shown in (h), the main valve H is closed, and the load current IL is transferred from the neutral point N to the circuit of the main valve H, the movable contact SM of the changeover switch S, the fixed contact S2, and the tap winding TW. .

最後に（リ）に示すように通電接点ＣＳの可動接点ＣＳＭが通電接点固定接点ＣＳ２に接続され、負荷電流ＩＬは、点線のように中性点Ｎから通電接点ＣＳの可動接点ＣＳＭを介して主バルブＨ、切換スイッチＳの可動接点ＳＭ、固定接点Ｓ２、タップ巻線ＴＷという回路と、中性点Ｎから通電接点ＣＳの可動接点ＣＳＭ、接点ＣＳ２、タップ巻線ＴＷという回路に分流する。   Finally, the movable contact CSM of the energizing contact CS is connected to the energized contact fixed contact CS2 as shown in (i), and the load current IL is passed from the neutral point N through the movable contact CSM of the energized contact CS as shown by the dotted line. The main valve H, the movable contact SM of the changeover switch S, the fixed contact S2, the tap winding TW, and the circuit from the neutral point N to the movable contact CSM of the energizing contact CS, the contact CS2, and the tap winding TW are divided.

これで、切換動作を完了し、図示の状態で運転を継続する。   Thus, the switching operation is completed and the operation is continued in the state shown in the drawing.

また、次のタップへの切換動作は図２０（ｂ）に示す(リ)から(イ)への順で行われる。   Further, the switching operation to the next tap is performed in the order from (i) to (a) shown in FIG.

この切換方式では、タップ選択器の可動接点Ｍ１、Ｍ２にそれぞれに限流抵抗Ｒ１と限流抵抗Ｒ２が接続されているため、真空バルブ極間に過電圧が印加されても、常に限流抵抗Ｒ１あるいはＲ２を介してタップ間短絡回路を形成することになり、真空バルブの接点間の耐電圧保護装置を必要としない。   In this switching method, the current limiting resistor R1 and the current limiting resistor R2 are connected to the movable contacts M1 and M2 of the tap selector, respectively. Therefore, even if an overvoltage is applied between the vacuum valve electrodes, the current limiting resistor R1 is always applied. Or the short circuit between taps will be formed via R2, and the withstand voltage protection apparatus between the contacts of a vacuum valve is not required.

また、遮断回数の多い主バルブＨの遮断電流の最大値は負荷電流ＩＬであり、主バルブの遮断電流の最大値を抑えることができる。万が一、図３３（ハ）の状態において、主バルブＨの遮断失敗が生じても、切換スイッチＳにより強制的に回路を開くことができるので、切換スイッチＳにおいて電流遮断が可能となり、信頼性の高い切換能力を有している。   Further, the maximum value of the cutoff current of the main valve H having a large number of cutoffs is the load current IL, and the maximum value of the cutoff current of the main valve can be suppressed. In the state of FIG. 33 (c), even if the main valve H fails to be shut off, the circuit can be forcibly opened by the changeover switch S. Therefore, the current can be cut off at the changeover switch S, and the reliability can be improved. High switching ability.

さらに、上述したように、通電接点ＣＳを設けることにより、常時の運転状態（図３３（イ）あるいは(リ)）で負荷電流ＩＬが通電接点ＣＳの固定接点ＣＳ１と主バルブＨあるいは通電接点ＣＳの固定接点ＣＳ２と主バルブＨに分流する。主バルブＨのみで負荷電流ＩＬを通電する場合、通電状態における温度上昇を抑えるため、主バルブＨの電極間の接触荷重を大きくし、電極間での接触抵抗を小さくする必要がある。   Further, as described above, by providing the energizing contact CS, the load current IL is changed between the fixed contact CS1 of the energizing contact CS and the main valve H or the energizing contact CS in a normal operation state (FIG. 33 (A) or (R)). To the fixed contact CS2 and the main valve H. When the load current IL is applied only by the main valve H, it is necessary to increase the contact load between the electrodes of the main valve H and reduce the contact resistance between the electrodes in order to suppress the temperature rise in the energized state.

常時の運転状態（図３３（イ）あるいは（リ））における負荷電流ＩＬを通電接点ＣＳの固定接点ＣＳ１と主バルブＨあるいは通電接点ＣＳの固定接点ＣＳ２と主バルブＨに分流できれば、主バルブの接触荷重および通電接点における接点接触荷重を低く抑えることができるため、切換開閉器の駆動機構部が簡素化できる。また、主バルブＨには通電能力を無視し、遮断能力が優れた真空バルブを採用することができる。   If the load current IL in the normal operation state (FIG. 33 (A) or (R)) can be diverted between the fixed contact CS1 of the energizing contact CS and the main valve H or the fixed contact CS2 of the energizing contact CS and the main valve H, Since the contact load and the contact load at the energized contact can be kept low, the drive mechanism of the switching switch can be simplified. In addition, the main valve H can be a vacuum valve that ignores the current-carrying ability and has an excellent shut-off ability.

次に本発明による２抵抗３バルブ切換方式を用いた負荷時タップ切換器の第３の実施形態について図３４乃至図４０を用いて説明する。   Next, a third embodiment of the on-load tap changer using the two-resistance three-valve switching method according to the present invention will be described with reference to FIGS.

図３４は２抵抗３バルブ切換方式を用いた切換開閉器の断面図、図３５乃至図４０はそれぞれ図３４におけるＡ−Ａ線、Ｂ−Ｂ線、Ｃ−Ｃ線、Ｄ−Ｄ線、Ｅ−Ｅ線、Ｆ−Ｆ線に沿う矢視断面図である。なお、真空バルブ開閉機構と、各可動接点に用いるスライド接点は図４及び図９と同じなので、これらの図示は省略して図４及び図９を流用することとする。   34 is a cross-sectional view of a switching switch using a two-resistor three-valve switching system, and FIGS. 35 to 40 are AA, BB, CC, DD, and E in FIG. It is arrow sectional drawing which follows the -E line and the FF line. Since the vacuum valve opening / closing mechanism and the slide contact used for each movable contact are the same as those in FIGS. 4 and 9, these illustrations are omitted, and FIGS. 4 and 9 are used.

図３４において、１は図示しない電動操作機構からの動力を受けてばねを蓄勢し、所定のエネルギを蓄勢した後、瞬発的にそのエネルギを放勢する蓄勢装置である。２はこの蓄勢装置１の出力軸に直結された駆動軸で、この駆動軸２は鉛直方向に適宜離間させて水平にそれぞれ設けられた上部プレート３及び下部プレート４の中心部にベアリング３ａ、４ａによって回動自在に軸支されている。なお、図３、図２１で示した下部プレート６の中心部に軸支するベアリング６ａを省略しているが、このベアリング６ａを設けた方が望ましいことは言うまでもない。   In FIG. 34, reference numeral 1 denotes a storage device that receives power from an electric operation mechanism (not shown) to store a spring, stores a predetermined energy, and then discharges the energy instantaneously. Reference numeral 2 denotes a drive shaft directly connected to the output shaft of the energy storage device 1, and the drive shaft 2 is provided with bearings 3a at the center of the upper plate 3 and the lower plate 4 that are horizontally spaced apart in the vertical direction. It is pivotally supported by 4a. Although the bearing 6a pivotally supported at the center of the lower plate 6 shown in FIGS. 3 and 21 is omitted, it goes without saying that it is desirable to provide this bearing 6a.

この駆動軸２の下部プレート４，６間に対応する軸下部には、真空バルブＨ、Ｗ1、Ｗ２を開閉するカム５が取付けられ、このカム５にはその円周方向の適宜箇所を上下方向に変位させたカム溝５ａ、５ｂが上下２段に形成されている。このカム５近傍の外周囲部に図３５にＵ、Ｖ、Ｗで示すように３相各相に対応する真空バルブ開閉機構３０が設けられている。   A cam 5 that opens and closes the vacuum valves H, W1, and W2 is attached to the lower portion of the shaft corresponding to the lower plate 4 and 6 of the drive shaft 2, and an appropriate position in the circumferential direction of the cam 5 is set up and down. The cam grooves 5a and 5b displaced in the vertical direction are formed in two upper and lower stages. As shown by U, V, and W in FIG. 35, vacuum valve opening / closing mechanisms 30 corresponding to the three phases are provided on the outer peripheral portion in the vicinity of the cam 5.

この真空バルブ開閉機構部３０は、固定接点３２及び可動接点３１を有する真空バルブＨ，Ｗ１、Ｗ２が円周上に配置され、この真空バルブの可動接点３１には図４（ａ），（ｂ）に示したように開閉ボス２４が取付け固定されている。   In the vacuum valve opening / closing mechanism 30, vacuum valves H, W1, W2 having a fixed contact 32 and a movable contact 31 are arranged on the circumference, and the movable contact 31 of the vacuum valve has a configuration shown in FIGS. The opening / closing boss 24 is attached and fixed as shown in FIG.

この開閉ボス２４は導通を確保するとともに、開閉動作の際には作動力を受ける役割を持っている。開閉ボス２４の内側凹所内にはワイプバネ２５が設けられ、その一端を後述する駆動ボス２０に、他端を開閉ボス２４の孔底面に当接して駆動ボス２０の動きに応じて通電に必要な接触力を可動接点３１に与えている。   The open / close boss 24 has a role of receiving conduction force during opening and closing operations while ensuring electrical continuity. A wipe spring 25 is provided in the inner recess of the opening / closing boss 24, one end of which is in contact with the driving boss 20 described later and the other end is in contact with the bottom of the hole of the opening / closing boss 24. A contact force is applied to the movable contact 31.

駆動ボス２０は、カム５に対し垂直方向に抜ける貫通孔を有し、且つカム５に対応する側面にカム溝５ａ，５ｂに係合するカムフォロア２１が回動自在に取付けられたもので、この駆動ボス２０はその貫通孔を通して両端部が下部プレート４，６にそれぞれ固定された２本の案内棒２９に挿通させて直進ガイド２８を介して上下動可能に設けられ、カム５の回転動作が平滑に行われるように支持されている。   The drive boss 20 has a through-hole extending in a direction perpendicular to the cam 5, and a cam follower 21 that engages with the cam grooves 5 a and 5 b is rotatably attached to a side surface corresponding to the cam 5. The drive boss 20 is inserted through two through-holes into two guide rods 29 fixed to the lower plates 4 and 6, respectively, so that the drive boss 20 can be moved up and down via a straight guide 28, and the cam 5 rotates. It is supported to perform smoothly.

また、開閉ボス２４側面には可撓導線２３が接続され、これら可撓導線２３は図３６に示すようにそれぞれ中性点プレートＮＰＣに接続される。   Also, flexible conducting wires 23 are connected to the side surfaces of the opening / closing boss 24, and these flexible conducting wires 23 are connected to neutral point plates NPC, respectively, as shown in FIG.

この中性点プレートＮＰＣには図３６に示すようにスライド接点７０が取付けられ、集電リングＮＳ０に摺動接触されている。この集電リングＮＳ０は、図３３に示すように駆動軸２に連結キー１００で固定された接続導体ＮＢに取付けられ、この接続導体ＮＢの他方には切換スイッチＳの上方で通電接点ＣＳの可動部８０が取付けられている。   A slide contact 70 is attached to the neutral point plate NPC as shown in FIG. 36, and is in sliding contact with the current collecting ring NS0. As shown in FIG. 33, the current collecting ring NS0 is attached to a connection conductor NB fixed to the drive shaft 2 with a connecting key 100, and the other of the connection conductors NB is connected to the movable contact CS above the changeover switch S. Part 80 is attached.

一方、接続導体ＮＢの外周部には空転機構４０と可動部５０から成る切換スイッチＳが配置されている。   On the other hand, a changeover switch S including an idling mechanism 40 and a movable portion 50 is disposed on the outer periphery of the connection conductor NB.

空転機構４０は、接続導体ＮＢに連結キー１１により固定された第１のカップリング１０と、このカップリング１０と空転動作を行わせる第２のカップリング５１とを備えている。第１のカップリング１０は、図３７に示すように凸部を有している。また、第２のカップリング５１は、第１のカップリング１０と同軸的に設けられ、且つ絶縁軸５３に固定された従動側となるもので、この第２のカップリング５１は、第１のカップリング１０の凸部が係合する第１の凹溝５１ａを有し、第１の凹溝５１ａと第１のカップリング１０の凸部間には空転角度θが設けられ、この空転角度θによる遅れ動作によって主バルブＨのしゃ断から切換スイッチＳの導通が離れるまでの時間を大きく取ることが可能になっている。   The idling mechanism 40 includes a first coupling 10 that is fixed to the connection conductor NB by the connecting key 11 and a second coupling 51 that performs idling operation with the coupling 10. The first coupling 10 has a convex portion as shown in FIG. The second coupling 51 is provided coaxially with the first coupling 10 and is a driven side fixed to the insulating shaft 53. The second coupling 51 The first concave groove 51a with which the convex portion of the coupling 10 engages is provided, and an idle angle θ is provided between the first concave groove 51a and the convex portion of the first coupling 10, and the idle angle θ Due to the delay operation, it is possible to take a long time from the disconnection of the main valve H to the disconnection of the changeover switch S.

また、可動部５０は、図３８、図３９に示すように空転機構４０の第２のカップリング５１と連結された絶縁軸５３と、この絶縁軸５３の周面に３相各相に対応させて取付けられた集電リングＳ０と、主バルブＨの固定接点３２に取付けられた通電台７１に固定され、この通電台を通電路として集電リングＳ０に摺動接触するスライド接点７０と、このスライド接点７０の上方の集電リングＳ０に固定され、スライド接点７０を有した可動接点ＳＭとで構成され、切換スイッチＳの固定接点Ｓ１、Ｓ２を可動部５０の回動に伴って選択可能になっている。   Further, as shown in FIGS. 38 and 39, the movable part 50 has an insulating shaft 53 connected to the second coupling 51 of the idling mechanism 40, and a peripheral surface of the insulating shaft 53 corresponding to each of the three phases. A current collecting ring S0 attached to the main valve H, and a slide contact 70 fixed to a current-carrying base 71 attached to the fixed contact 32 of the main valve H. The movable contact SM is fixed to the current collecting ring S0 above the slide contact 70 and has the slide contact 70, and the fixed contacts S1 and S2 of the changeover switch S can be selected as the movable portion 50 rotates. It has become.

さらに、通電接点ＣＳの可動部８０は、図４０に示すように中性点端子ＮＰと中性点接点台Ｎ１にスライド接点７０を介して電気的に接続されている。また、通電接点ＣＳの可動部８０は、可動接点ＣＳＭの回動に伴い、スライド接点７０を有した固定接点ＣＳ１、ＣＳ２を選択可能にしている。   Furthermore, the movable part 80 of the energizing contact CS is electrically connected to the neutral point terminal NP and the neutral point contact base N1 via the slide contact 70 as shown in FIG. Further, the movable portion 80 of the energizing contact CS can select the fixed contacts CS1 and CS2 having the slide contact 70 as the movable contact CSM rotates.

中性点端子ＮＰと中性点接点台Ｎ１に取付けたスライド接点７０は、通電接点ＣＳの可動接点ＣＳＭの回動を邪魔しないように、図３４に示すように通電接点の可動部８０を挟持して取付けられ、上下のスライド接点７０の間を可動接点ＣＳＭが潜りぬけられるようになっている。   The slide contact 70 attached to the neutral point terminal NP and the neutral point contact base N1 sandwiches the movable portion 80 of the energized contact as shown in FIG. 34 so as not to disturb the rotation of the movable contact CSM of the energized contact CS. Thus, the movable contact CSM can pass through between the upper and lower slide contacts 70.

切換スイッチＳ及び通電接点ＣＳの固定接点Ｓ１とＣＳ１、Ｓ２とＣＳ２は、それぞれ接点台９１、９２を介し、端子Ｍ１Ｐ、Ｍ２Ｐに接続され、端子Ｍ１Ｐ、Ｍ２Ｐは図示していないタップ選択器のそれぞれの隣接するタップの可動接点Ｍ１、Ｍ２に接続される。   The changeover switch S and the fixed contacts S1 and CS1, and S2 and CS2 of the energizing contact CS are connected to terminals M1P and M2P via contact bases 91 and 92, respectively, and the terminals M1P and M2P are not shown in the figure. Are connected to movable contacts M1 and M2 of adjacent taps.

上記スライド接点７０は図９に示した構成と同様なので、ここではその説明を省略する。   Since the slide contact 70 has the same configuration as that shown in FIG. 9, its description is omitted here.

次に上記のように構成された負荷時タップ切換器の動作を図４１乃至図５０により説明する。   Next, the operation of the on-load tap changer configured as described above will be described with reference to FIGS.

図４１（ａ）はタップＴ１における正規運転状態であり、カム溝５ｂにより抵抗バルブＷ１が閉、抵抗バルブＷ２が開、カム溝５ａにより主バルブＨが閉の状態にある。図４１（ｂ）は切換を完了し、タップＴ２における正規運転状態を示し、抵抗バルブＷ１が開、抵抗バルブＷ２が閉、主バルブＨが閉の状態にある。   FIG. 41A shows a normal operation state at the tap T1, in which the resistance valve W1 is closed by the cam groove 5b, the resistance valve W2 is opened, and the main valve H is closed by the cam groove 5a. FIG. 41 (b) shows the normal operation state at the tap T2 when the switching is completed, and the resistance valve W1 is open, the resistance valve W2 is closed, and the main valve H is closed.

このときの切換動作シーケンスは図２０に示した通りである。以下その動作について図４２乃至図５０を用いて説明する。   The switching operation sequence at this time is as shown in FIG. The operation will be described below with reference to FIGS.

各図の（ａ）は図３３に対応した回路図、（ｂ）はカム５と主バルブＨ、抵抗バルブＷ１、Ｗ２の動作状態、（ｃ）は通電接点ＣＳにおける可動接点ＣＳＭの動作状態、（ｄ）は中性点プレートＮＰＣに取付けたスライド接点７０と集電リングＮＳ０の状態、（ｅ）は切換スイッチＳの可動接点ＳＭと固定接点Ｓ１、Ｓ２の接触状態、（ｆ）は切換スイッチＳにおける通電台７１に取付けたスライド接点７０と集電リングＳ０の状態、（ｇ）は空転機構４０の動作状態を示している。   In each figure, (a) is a circuit diagram corresponding to FIG. 33, (b) is an operating state of the cam 5, the main valve H, and the resistance valves W1 and W2, (c) is an operating state of the movable contact CSM in the energizing contact CS, (D) is a state of the slide contact 70 and the current collecting ring NS0 attached to the neutral point plate NPC, (e) is a contact state of the movable contact SM of the changeover switch S and the fixed contacts S1, S2, and (f) is a changeover switch. The state of the slide contact 70 and the current collecting ring S0 attached to the energizing base 71 in S, (g) shows the operating state of the idling mechanism 40.

なお、ここでは見やすいように各々の可動接点は、スライド接点７０の可撓銅箔６１と接点６４のみを図示した。   For ease of viewing, only the flexible copper foil 61 and the contact 64 of the slide contact 70 are shown as the movable contacts here.

図４２はタップＴ１における運転状態を示し、主バルブＨ、抵抗バルブＷ１が閉じ、抵抗バルブＷ２が開極し、切換スイッチＳの可動接点ＳＭは固定接点Ｓ１を選択し、通電接点ＣＳの可動接点ＣＳＭは固定接点ＣＳ１を選択している。   FIG. 42 shows an operation state at the tap T1, the main valve H and the resistance valve W1 are closed, the resistance valve W2 is opened, the movable contact SM of the changeover switch S selects the fixed contact S1, and the movable contact of the energizing contact CS. The CSM selects the fixed contact CS1.

この状態で駆動軸２が回動すると、図４３（ｄ）に示すように駆動軸２に取付けられた接続導体ＮＢを介して集電リングＮＳ０が回動する。この集電リングＮＳ０が回動すると、接続導体ＮＢの他方（集電リングＮＳ０が取付けられた逆側）に取付けられた通電接点ＣＳの可動接点ＣＳＭも回動を行い、図４３（ｃ）に示すように固定接点ＣＳ１から開離する。また、カム５も回転を始めるが、カム溝５ａの水平面にカムフォロア２１があるため、図４３（ｂ）に示すように真空バルブの電極はまだ動かないままである。   When the drive shaft 2 rotates in this state, the current collecting ring NS0 rotates through the connection conductor NB attached to the drive shaft 2 as shown in FIG. When the current collecting ring NS0 rotates, the movable contact CSM of the energizing contact CS attached to the other of the connection conductors NB (the opposite side to which the current collecting ring NS0 is attached) also rotates, as shown in FIG. As shown, it is separated from the fixed contact CS1. Further, although the cam 5 also starts rotating, the electrode of the vacuum valve still does not move as shown in FIG. 43B because the cam follower 21 is in the horizontal plane of the cam groove 5a.

この時、切換スイッチ空転機構４０の第１のカップリング１０が回転するが、空転部５１ａにカップリング１０があるため、第２のカップリング５１は静止したままであり、切換スイッチＳの可動部５０の集電リングＳ０は回転せず、切換スイッチＳの可動接点ＳＭは固定接点Ｓ１に接触したままである（図４３（ｅ）〜（ｇ））。   At this time, the first coupling 10 of the changeover switch idling mechanism 40 rotates. However, since the idling part 51a has the coupling 10, the second coupling 51 remains stationary, and the movable part of the changeover switch S is moved. The current collecting ring S0 of 50 does not rotate, and the movable contact SM of the changeover switch S remains in contact with the fixed contact S1 (FIGS. 43 (e) to (g)).

次いで、駆動軸２がさらに回転を行うと、図４４（ｂ）に示すようにカムフォロア２１がカム溝５ａの傾斜面に沿って移動し、主バルブＨが開き始める。このとき、通電接点ＣＳの可動接点ＣＳＭは図４４（ｃ）に示すように固定接点ＣＳ１から完全に開離している。また、空転機構４０のカップリング１０はまだ空転部５１aにあるため、第２のカップリング５１は静止したままである（図４４（ｇ））。   Next, when the drive shaft 2 further rotates, as shown in FIG. 44B, the cam follower 21 moves along the inclined surface of the cam groove 5a, and the main valve H starts to open. At this time, the movable contact CSM of the energization contact CS is completely separated from the fixed contact CS1 as shown in FIG. 44 (c). Further, since the coupling 10 of the idling mechanism 40 is still in the idling portion 51a, the second coupling 51 remains stationary (FIG. 44 (g)).

その後、図４５（ｂ）に示すようにカムフォロア２１がカム溝５ｂの傾斜面に沿って移動し、抵抗バルブＷ２が閉極し始める。このとき、主バルブＨのカムフォロア２１は傾斜をくだりきって水平面に移動し、主バルブＨは完全に開極する。また、切換スイッチ空転機構４０の第１のカップリング１０と第２のカップリング５１が係合し、絶縁軸５３を介し、切換スイッチ可動部の集電リングＳ０を介して可動接点ＳＭとが回動を行う（図４５（ｅ）〜（ｇ））。   Thereafter, as shown in FIG. 45B, the cam follower 21 moves along the inclined surface of the cam groove 5b, and the resistance valve W2 begins to close. At this time, the cam follower 21 of the main valve H is completely inclined and moves to the horizontal plane, and the main valve H is completely opened. Further, the first coupling 10 and the second coupling 51 of the changeover switch idling mechanism 40 are engaged, and the movable contact SM is rotated via the insulating shaft 53 and the current collecting ring S0 of the changeover switch movable portion. The movement is performed (FIGS. 45E to 45G).

駆動軸２の回転が続き、図４６（ｂ）に示すように抵抗バルブＷ２のカムフォロア２１がカム溝５ｂの傾斜を登りきると、図４６（ｅ）のように切換スイッチＳの可動接点ＳＭは固定接点Ｓ１から離れる。   When the rotation of the drive shaft 2 continues and the cam follower 21 of the resistance valve W2 climbs the inclination of the cam groove 5b as shown in FIG. 46 (b), the movable contact SM of the changeover switch S is fixed as shown in FIG. 46 (e). Move away from the contact S1.

その後、図４７（ｂ）に示すように真空バルブＶ２のカムフォロア２１がカム溝５ｂの傾斜をくだり、抵抗バルブＷ１が開極する。このとき、主バルブＨは開、抵抗バルブＷ２は閉の状態にある。   Thereafter, as shown in FIG. 47B, the cam follower 21 of the vacuum valve V2 tilts the cam groove 5b, and the resistance valve W1 opens. At this time, the main valve H is open and the resistance valve W2 is closed.

次に切換スイッチＳの可動接点ＳＭが図４８（ｅ）に示すように固定接点Ｓ２と接触する。このとき、主バルブＨは図４８（ｂ）に示すように開、抵抗バルブＷ１は開、抵抗バルブＷ２が閉の状態にある。   Next, the movable contact SM of the changeover switch S comes into contact with the fixed contact S2 as shown in FIG. At this time, as shown in FIG. 48B, the main valve H is open, the resistance valve W1 is open, and the resistance valve W2 is closed.

また、駆動軸２によりカム５が回転すると、図４９（ｂ）に示すように主バルブＨのカムフォロア２１はカム溝５aの傾斜を登り、閉極する。このとき、切換スイッチＳの可動接点ＳＭは完全に固定接点Ｓ２と接触しているが、通電接点ＣＳの可動接点ＣＳＭはまだ固定接点ＣＳ２に接触していない状態にある（図４９（ｃ）、（ｅ））。   When the cam 5 is rotated by the drive shaft 2, as shown in FIG. 49B, the cam follower 21 of the main valve H climbs the slope of the cam groove 5a and closes the pole. At this time, the movable contact SM of the changeover switch S is completely in contact with the fixed contact S2, but the movable contact CSM of the energizing contact CS is not yet in contact with the fixed contact CS2 (FIG. 49 (c)). (E)).

さらに、駆動軸２の回転が進むと、図５０（ｃ）に示すように通電接点ＣＳの可動接点ＣＳＭが完全に固定接点ＣＳ２と接触状態になり、切換が完了し、タップＴ２による運転状態となる。このとき、主バルブＨは図５０（ｂ）に示すように閉、抵抗バルブＷ１は開、抵抗バルブＷ２は閉の状態である。   Further, when the rotation of the drive shaft 2 proceeds, as shown in FIG. 50 (c), the movable contact CSM of the energizing contact CS is completely brought into contact with the fixed contact CS2, the switching is completed, and the operation state by the tap T2 is changed. Become. At this time, as shown in FIG. 50B, the main valve H is closed, the resistance valve W1 is opened, and the resistance valve W2 is closed.

以上の説明はタップＴ１からＴ２への切換動作であるが、タップＴ２からＴ１への切換は前述と逆動作となるだけなので、ここではその説明を省略する。   The above description is the switching operation from the tap T1 to T2, but the switching from the tap T2 to T1 is only the reverse operation to that described above, so the description thereof is omitted here.

なお、ここでは通電接点の可動部８０は中性点端子ＮＰと中性点接点台Ｎ１にスライド接点７０を介して電気的に接続しているが、第２の実施形態で示した可撓導線１２３で接続することも可能であることは言うまでもない。   Here, the movable portion 80 of the energizing contact is electrically connected to the neutral point terminal NP and the neutral point contact base N1 via the slide contact 70, but the flexible conductor shown in the second embodiment Needless to say, it is also possible to connect at 123.

このように本発明の第３の実施形態では、真空バルブの開閉機構３０は真空バルブに開閉動作を伝達するカム５を中心にその外周に３相各相に対応する真空バルブを円周方向に等間隔に配置し、カム５の上方に切換スイッチＳと通電接点ＣＳの各々の回転部および接続導体ＮＢを駆動軸と同軸的に取付ける構成としたので、デッドスペースを有効に活用でき、コンパクトな配置が可能であるとともに、駆動軸２と、カム５、切換スイッチＳ、通電接点ＣＳすべてを同軸で駆動するため、複雑な機構とならずに２抵抗３バルブ切換方式の安定した切換シーケンスを得ることができる。   As described above, in the third embodiment of the present invention, the vacuum valve opening / closing mechanism 30 has the cam 5 that transmits the opening / closing operation to the vacuum valve as the center, and the vacuum valves corresponding to the three phases are arranged in the circumferential direction on the outer periphery thereof. Since the rotating parts of the changeover switch S and the energizing contact CS and the connection conductor NB are mounted coaxially with the drive shaft above the cam 5, the dead space can be used effectively and is compact. The drive shaft 2, the cam 5, the changeover switch S, and the energizing contact CS are all driven coaxially, so that a stable switching sequence of the two-resistance three-valve switching method can be obtained without using a complicated mechanism. be able to.

また、カム５を駆動軸２の下端部に配置し、その上方に真空バルブ、切換スイッチＳ、通電接点ＣＳを配置することにより、タップ選択器のそれぞれの隣接するタップの可動接点Ｍ１、Ｍ２に接続される端子Ｍ１Ｐ、Ｍ２Ｐを上方に配置することができる。   Further, the cam 5 is disposed at the lower end of the drive shaft 2 and the vacuum valve, the changeover switch S, and the energizing contact CS are disposed above the cam 5 so that the movable contacts M1 and M2 of the adjacent taps of the tap selector are connected to each other. The terminals M1P and M2P to be connected can be arranged above.

ところで、上記端子Ｍ１Ｐ、Ｍ２Ｐはワイプばね等により、切換開閉器を変圧器と隔離した容器に設けた固定接点に半径方向に接圧され、容器固定接点を介してタップ選択器の可動接点Ｍ１、Ｍ２と接続する場合がある。   By the way, the terminals M1P and M2P are contacted in a radial direction by a wipe spring or the like to a fixed contact provided on a container having a switching switch isolated from the transformer, and the movable contact M1 of the tap selector via the container fixed contact. May connect to M2.

通常、切換開閉器は容器上部に設けたフランジに吊り下げ固定するため、切換開閉器を斜めに取付けた場合、端子Ｍ１Ｐ、Ｍ２Ｐに十分なワイプ量、荷重を与えないと端子Ｍ１Ｐ、Ｍ２Ｐと容器側の固定接点が不完全接触となる可能性がある。   Usually, since the switching switch is suspended and fixed to a flange provided on the upper part of the container, when the switching switch is mounted obliquely, the terminals M1P and M2P and the container must be provided unless a sufficient wipe amount and load are applied to the terminals M1P and M2P. The fixed contact on the side may be incomplete contact.

したがって、上記のように端子Ｍ１Ｐ、Ｍ２Ｐが上下方向位置で切換開閉器を固定する容器上部から近いところに位置しているので、この影響を受けにくくなるというメリットがある。   Therefore, as described above, since the terminals M1P and M2P are located close to the upper part of the container that fixes the switching switch at the vertical position, there is an advantage that it is less susceptible to this influence.

本発明における切換開閉器では、端子Ｍ１Ｐ、Ｍ２Ｐを上方に配置することができるため、切換開閉器が斜めになることによる不完全接触の影響を軽減でき、安定した通電ができる。   In the switching switch according to the present invention, since the terminals M1P and M2P can be arranged upward, the influence of incomplete contact due to the switching switch being inclined can be reduced, and stable energization can be performed.

以上のように本発明の第３の実施形態によれば、２抵抗３バルブ切換方式を用いた安定した通電と切換動作を実現するコンパクトな切換開閉器を提供することができる。   As described above, according to the third embodiment of the present invention, it is possible to provide a compact switching switch that realizes stable energization and switching operation using the 2-resistance 3-valve switching system.

（第４の実施形態）
図５１は、本発明による２抵抗３バルブ切換方式を用いた負荷時タップ切換器の第４の実施形態について図５１乃至図６８を用いて説明する。 (Fourth embodiment)
FIG. 51 illustrates a fourth embodiment of the on-load tap changer using the 2-resistance 3-valve switching method according to the present invention, with reference to FIGS. 51 to 68.

なお、本実施形態の２抵抗３バルブ切換方式を用いた切換開閉器の切換回路図は、図３３と同様であり、また、その切換シーケンスは図２０と同様なので、ここではその説明を省略する。   Note that the switching circuit diagram of the switching switch using the two-resistor three-valve switching system of this embodiment is the same as that of FIG. 33 and the switching sequence thereof is the same as that of FIG. .

図５１は、２抵抗３バルブ切換方式を用いた切換開閉器の断面図、図５２は真空バルブ開閉機構を拡大して示す正面図及び側面図、図５３〜図５８はそれぞれ図５１におけるＡ−Ａ線、Ｂ−Ｂ線、Ｃ−Ｃ線、Ｄ−Ｄ線、Ｅ−Ｅ線、Ｆ−Ｆ線に沿う矢視断面図である。   51 is a sectional view of a switching switch using a two-resistor three-valve switching system, FIG. 52 is an enlarged front view and side view showing a vacuum valve switching mechanism, and FIGS. It is arrow sectional drawing which follows an A line, BB line, CC line, DD line, EE line, and FF line.

図５１において、１は図示しない電動操作機構からの動力を受けてばねを蓄勢し、所定のエネルギを蓄勢した後、瞬発的にそのエネルギを放勢する蓄勢装置である。２はこの蓄勢装置１の出力軸に直結された駆動軸で、この駆動軸２は鉛直方向に適宜離間させて水平にそれぞれ設けられた上部プレート３及び下部プレート４、６の中心部にベアリング３a、４a、６aによって回動自在に軸支されている。この場合、上部プレート３及び下部プレート４は駆動軸２の上部に対応する位置に設けられ、また下部プレート６は駆動軸の下端部に対応する位置に設けられている。   In FIG. 51, reference numeral 1 denotes a storage device that receives power from an electric operation mechanism (not shown) to store a spring, stores a predetermined energy, and then discharges the energy instantaneously. Reference numeral 2 denotes a drive shaft directly connected to the output shaft of the energy accumulator 1. The drive shaft 2 is provided with bearings in the center of the upper plate 3 and the lower plates 4 and 6 that are horizontally spaced apart from each other as appropriate. It is pivotally supported by 3a, 4a, 6a. In this case, the upper plate 3 and the lower plate 4 are provided at a position corresponding to the upper portion of the drive shaft 2, and the lower plate 6 is provided at a position corresponding to the lower end portion of the drive shaft.

この駆動軸２の上部プレート３及び下部プレート４間に対応する軸部には、真空バルブＨ、Ｗ1、Ｗ２を開閉するカム５が取付けられ、このカム５にはその円周方向の適宜箇所を上下方向に変位させたカム溝５ａ、５ｂ、５ｃが上下方向に３段形成されている。このカム５近傍の外周囲部に図５３にＵ、Ｖ、Ｗで示すように３相各相に対応する真空バルブ開閉機構３０が設けられている。   A cam 5 that opens and closes the vacuum valves H, W1, and W2 is attached to the shaft portion corresponding to the space between the upper plate 3 and the lower plate 4 of the drive shaft 2, and the cam 5 is provided with appropriate portions in the circumferential direction. Cam grooves 5a, 5b, 5c displaced in the vertical direction are formed in three steps in the vertical direction. As shown by U, V, and W in FIG. 53, vacuum valve opening / closing mechanisms 30 corresponding to the three phases are provided on the outer peripheral portion in the vicinity of the cam 5.

この真空バルブ開閉機構部３０は、固定接点３２及び可動接点３１を有する真空バルブＨ，Ｗ１、Ｗ２が円周上に配置され、この真空バルブの可動接点３１には図５２（ａ），（ｂ）に示したように開閉ボス２４が取付け固定されている。   In this vacuum valve opening / closing mechanism 30, vacuum valves H, W1, W2 having a fixed contact 32 and a movable contact 31 are arranged on the circumference, and the movable contact 31 of this vacuum valve is shown in FIGS. The opening / closing boss 24 is attached and fixed as shown in FIG.

この開閉ボス２４は導通を確保するとともに、開閉動作の際には作動力を受ける役割を持っている。開閉ボス２４の外側にはワイプバネ２５が設けられ、その一端を駆動ボス２０に、他端を開閉ボス２４の底面に当接して駆動ボス２０の動きに応じて通電に必要な接触力を可動接点３１に与えている。   The open / close boss 24 has a role of receiving conduction force during opening and closing operations while ensuring electrical continuity. A wipe spring 25 is provided on the outside of the open / close boss 24. One end of the wipe spring 25 is brought into contact with the drive boss 20, and the other end is brought into contact with the bottom surface of the open / close boss 24. 31.

駆動ボス２０は、カム５に対し垂直方向に抜ける貫通孔を有し、且つカム５に対応する側面にカム溝５ａ，５ｂ，５ｃに係合するカムフォロア２１が回動自在に取付けられたもので、駆動ボス２０はその貫通孔を通して両端部が上部プレート３及び下部プレート４にそれぞれ固定された２本の案内棒２９に挿通させて直進ガイド２８を介して上下動可能に設けられ、カム５の回転動作が平滑に行われるように支持されている。   The drive boss 20 has a through-hole extending in a direction perpendicular to the cam 5, and a cam follower 21 that engages with the cam grooves 5 a, 5 b, 5 c is rotatably attached to a side surface corresponding to the cam 5. The drive boss 20 is inserted through two through-holes into two guide rods 29 each fixed to the upper plate 3 and the lower plate 4 so as to be movable up and down via a straight guide 28. It is supported so that the rotation operation is performed smoothly.

また、開閉ボス２４の側面には可撓導線２３が接続され、これら可撓導線２３はそれぞれ中性点プレートＮＰＣに接続される。   Further, flexible conductive wires 23 are connected to the side surfaces of the opening / closing boss 24, and these flexible conductive wires 23 are connected to the neutral point plate NPC, respectively.

この中性点プレートＮＰＣには、図５４に示すようにスライド接点７０が取付けられ、集電リングＮＳ０に摺動接触されている。この集電リングＮＳ０は、図５１に示すように駆動軸２に連結キー１００で固定された例えば黄銅あるいは青銅からなる接続導体ＮＢに取付けられ、この接続導体ＮＢの他方には切換スイッチＳの下方で通電接点の可動部８０が取付けられている。   As shown in FIG. 54, a slide contact 70 is attached to the neutral point plate NPC and is in sliding contact with the current collecting ring NS0. As shown in FIG. 51, the current collecting ring NS0 is attached to a connection conductor NB made of, for example, brass or bronze, which is fixed to the drive shaft 2 with a connecting key 100, and the other side of the connection conductor NB is below the selector switch S. The movable portion 80 of the energizing contact is attached.

一方、接続導体ＮＢの外周部には空転機構４０と可動部５０から成る切換スイッチＳが配置されている。   On the other hand, a changeover switch S including an idling mechanism 40 and a movable portion 50 is disposed on the outer periphery of the connection conductor NB.

空転機構４０は、接続導体ＮＢに連結キー１１により固定された第１のカップリング１０と、このカップリング１０と空転動作を行わせる第２のカップリング５１とを備えている。第１のカップリング１０は図５７に示すように凸部を有している。また、第２のカップリング５１は、第１のカップリング１０と同軸的に設けられ、且つ絶縁軸５３に固定された従動側となるもので、この第２のカップリング５１は、第１のカップリング１０の凸部が係合する第１の凹溝５１ａを有し、第１の凹溝５１ａと第１のカップリング１０の凸部間には空転角度θが設けられ、この空転角度θによる遅れ動作によって主バルブＨのしゃ断から切換スイッチＳの導通が離れるまでの時間を大きく取ることが可能になっている。   The idling mechanism 40 includes a first coupling 10 that is fixed to the connection conductor NB by the connecting key 11 and a second coupling 51 that performs idling operation with the coupling 10. The first coupling 10 has a convex portion as shown in FIG. The second coupling 51 is provided coaxially with the first coupling 10 and is a driven side fixed to the insulating shaft 53. The second coupling 51 The first concave groove 51a with which the convex portion of the coupling 10 engages is provided, and an idle angle θ is provided between the first concave groove 51a and the convex portion of the first coupling 10, and the idle angle θ Due to the delay operation, it is possible to take a long time from the disconnection of the main valve H to the disconnection of the changeover switch S.

また、可動部５０は、図５５、図５６に示すように空転機構４０の第２のカップリング５１と連結された絶縁軸５３と、この絶縁軸５３の周面に３相各相に対応させて取付けられた集電リングＳ０と、主バルブＨの固定接点３２に取付けられた通電台７１に固定され、この通電台を通電路として集電リングＳ０に摺動接触するスライド接点７０と、このスライド接点７０の下方の集電リングＳ０に固定され、スライド接点７０を有した可動接点ＳＭとで構成され、切換スイッチＳの固定接点Ｓ１、Ｓ２を可動部５０の回動に伴って選択可能になっている。   Further, as shown in FIGS. 55 and 56, the movable part 50 has an insulating shaft 53 connected to the second coupling 51 of the idling mechanism 40 and a peripheral surface of the insulating shaft 53 corresponding to each of the three phases. A current collecting ring S0 attached to the main valve H, and a slide contact 70 fixed to a current-carrying base 71 attached to the fixed contact 32 of the main valve H. The movable contact SM is fixed to the current collecting ring S0 below the slide contact 70 and has the slide contact 70. The fixed contacts S1 and S2 of the changeover switch S can be selected as the movable portion 50 rotates. It has become.

さらに、通電接点ＣＳの可動部８０は、図５８に示すように中性点端子ＮＰと中性点接点台Ｎ１にスライド接点７０を介して電気的に接続されている。また、通電接点ＣＳの可動部８０は、可動接点ＣＳＭの回動に伴い、スライド接点７０を有した固定接点ＣＳ１、ＣＳ２を選択可能にしている。   Furthermore, the movable part 80 of the energizing contact CS is electrically connected to the neutral point terminal NP and the neutral point contact base N1 via the slide contact 70 as shown in FIG. Further, the movable portion 80 of the energizing contact CS can select the fixed contacts CS1 and CS2 having the slide contact 70 as the movable contact CSM rotates.

中性点端子ＮＰと中性点接点台Ｎ１に取付けたスライド接点７０は、可動接点ＣＳＭの回動を邪魔しないように、図５１に示すように通電接点ＣＳの可動部８０を挟持して取付けられ、上下のスライド接点７０の間を可動接点ＣＳＭが潜りぬけられるようになっている。   The slide contact 70 attached to the neutral point terminal NP and the neutral point contact base N1 is attached by sandwiching the movable portion 80 of the energizing contact CS as shown in FIG. 51 so as not to disturb the rotation of the movable contact CSM. Thus, the movable contact CSM can be penetrated between the upper and lower slide contacts 70.

切換スイッチＳ及び通電接点ＣＳの固定接点Ｓ１とＣＳ１、Ｓ２とＣＳ２はそれぞれ接点台９１、９２を介して端子Ｍ１Ｐ、Ｍ２Ｐに接続され、端子Ｍ１Ｐ、Ｍ２Ｐは図示していないタップ選択器のそれぞれの隣接するタップの可動接点Ｍ１、Ｍ２に接続される。   The changeover switch S and the fixed contacts S1 and CS1, and S2 and CS2 of the energizing contact CS are connected to terminals M1P and M2P via contact bases 91 and 92, respectively, and the terminals M1P and M2P are connected to the respective tap selectors not shown. It is connected to movable contacts M1 and M2 of adjacent taps.

上記スライド接点７０は第１の実施形態の図９に示した構成と同様なので、ここではその説明を省略する。   Since the slide contact 70 has the same configuration as that of the first embodiment shown in FIG. 9, the description thereof is omitted here.

次に上記のように構成された負荷時タップ切換器の動作を図５９から図６８により説明する。   Next, the operation of the on-load tap changer configured as described above will be described with reference to FIGS.

図５９（ａ）はタップＴ１における正規運転状態であり、カム溝５ｂにより抵抗バルブＷ１が閉、カム溝５ａにより抵抗バルブＷ２が開、カム溝５ｃにより主バルブＨが閉の状態にある。図５９（ｂ）は切換を完了し、タップＴ２における正規運転状態を示し、抵抗バルブＷ１が開、抵抗バルブＷ２が閉、主バルブＨが閉の状態にある。   FIG. 59A shows a normal operation state at the tap T1, in which the resistance valve W1 is closed by the cam groove 5b, the resistance valve W2 is opened by the cam groove 5a, and the main valve H is closed by the cam groove 5c. FIG. 59B shows the normal operation state at the tap T2 after the switching is completed, and the resistance valve W1 is open, the resistance valve W2 is closed, and the main valve H is closed.

このときの切換動作シーケンスは図２０に示した通りである。以下その動作について図６０乃至図６８を用いて説明する。   The switching operation sequence at this time is as shown in FIG. The operation will be described below with reference to FIGS.

各図の（ａ）は図３３に対応した回路図、（ｂ）はカム５と主バルブＨ、抵抗バルブＷ１、Ｗ２の動作状態、（ｃ）は通電接点ＣＳにおける可動接点ＣＳＭの動作状態、（ｄ）は中性点プレートＮＰＣに取付けたスライド接点７０と集電リングＮＳ０の状態、（ｅ）は切換スイッチＳの可動接点ＳＭと固定接点Ｓ１、Ｓ２の接触状態、（ｆ）は切換スイッチＳにおける通電台７１に取付けたスライド接点７０と集電リングＳ０の状態、（ｇ）は空転機構４０の動作状態を示している。   In each figure, (a) is a circuit diagram corresponding to FIG. 33, (b) is an operating state of the cam 5, the main valve H, and the resistance valves W1 and W2, (c) is an operating state of the movable contact CSM in the energizing contact CS, (D) is a state of the slide contact 70 and the current collecting ring NS0 attached to the neutral point plate NPC, (e) is a contact state of the movable contact SM of the changeover switch S and the fixed contacts S1, S2, and (f) is a changeover switch. The state of the slide contact 70 and the current collecting ring S0 attached to the energizing base 71 in S, (g) shows the operating state of the idling mechanism 40.

なお、ここでは見やすいように各々の可動接点は、スライド接点７０の可撓銅箔６１と接点６４のみを図示した。   For ease of viewing, only the flexible copper foil 61 and the contact 64 of the slide contact 70 are shown as the movable contacts here.

図６０はタップＴ１における運転状態を示し、主バルブＨ、抵抗バルブＷ１が閉じ、抵抗バルブＷ２が開極し、切換スイッチＳの可動接点ＳＭは固定接点Ｓ１を選択し、通電接点ＣＳの可動接点ＣＳＭは固定接点ＣＳ１を選択している。   FIG. 60 shows the operation state at the tap T1, the main valve H and the resistance valve W1 are closed, the resistance valve W2 is opened, the movable contact SM of the changeover switch S selects the fixed contact S1, and the movable contact of the energizing contact CS. The CSM selects the fixed contact CS1.

この状態で駆動軸２が回動すると、図６１（ｄ）に示すように駆動軸２に取付けられた接続導体ＮＢを介して集電リングＮＳ０が回動する。この集電リングＮＳ０が回動すると、接続導体ＮＢの他方（集電リングＮＳ０が取付けられた逆側）に取付けられた通電接点ＣＳの可動接点ＣＳＭも回動を行い、図６１（ｃ）に示すように固定接点ＣＳ１から開離する。また、カム５も回転を始めるが、カム溝５ａ、５ｂ、５ｃの水平面にカムフォロア２１があるため、図６１（ｂ）に示すように真空バルブの電極はまだ動かないままである。   When the drive shaft 2 rotates in this state, the current collecting ring NS0 rotates through the connection conductor NB attached to the drive shaft 2 as shown in FIG. 61 (d). When the current collecting ring NS0 rotates, the movable contact CSM of the energizing contact CS attached to the other side of the connection conductor NB (the opposite side to which the current collecting ring NS0 is attached) also rotates, as shown in FIG. 61 (c). As shown, it is separated from the fixed contact CS1. The cam 5 also starts rotating, but the electrode of the vacuum valve still does not move as shown in FIG. 61 (b) because the cam follower 21 is in the horizontal plane of the cam grooves 5a, 5b, and 5c.

この時、切換スイッチ空転機構４０の第１のカップリング１０が回転するが、空転部５１ａにカップリング１０があるため、第２のカップリング５１は静止したままであり、切換スイッチＳの可動部５０の集電リングＳ０は回転せず、切換スイッチＳの可動接点ＳＭは固定接点Ｓ１に接触したままである（図６１（ｅ）〜（ｇ））。   At this time, the first coupling 10 of the changeover switch idling mechanism 40 rotates. However, since the idling part 51a has the coupling 10, the second coupling 51 remains stationary, and the movable part of the changeover switch S is moved. The 50 current collecting ring S0 does not rotate, and the movable contact SM of the changeover switch S remains in contact with the fixed contact S1 (FIGS. 61 (e) to (g)).

次いで、駆動軸２がさらに回転を行うと、図６２（ｂ）に示すようにカムフォロア２１がカム溝５ｃの傾斜面に沿って移動し、主バルブＨが開き始める。このとき、通電接点ＣＳの可動接点ＣＳＭは図６２（ｃ）に示すように固定接点ＣＳ１から完全に開離している。また、空転機構４０のカップリング１０はまだ空転部５１ａにあるため、第２のカップリング５１は静止したままである（図６２（ｇ））。   Next, when the drive shaft 2 further rotates, as shown in FIG. 62B, the cam follower 21 moves along the inclined surface of the cam groove 5c, and the main valve H starts to open. At this time, the movable contact CSM of the energization contact CS is completely separated from the fixed contact CS1 as shown in FIG. 62 (c). Further, since the coupling 10 of the idling mechanism 40 is still in the idling portion 51a, the second coupling 51 remains stationary (FIG. 62 (g)).

その後、図６３（ｂ）に示すようにカムフォロア２１がカム溝５ａの傾斜面に沿って移動し、抵抗バルブＷ２が閉極し始める。このとき、主バルブＨのカムフォロア２１は傾斜をくだりきって水平面に移動し、主バルブＨは完全に開極する。また、切換スイッチ空転機構４０の第１のカップリング１０と第２のカップリング５１が係合し、絶縁軸５３を介し、切換スイッチＳの可動部５０の集電リングＳ０を介して可動接点ＳＭとが回動を行う（図６３（ｅ）〜（ｇ））。   Thereafter, as shown in FIG. 63B, the cam follower 21 moves along the inclined surface of the cam groove 5a, and the resistance valve W2 starts to close. At this time, the cam follower 21 of the main valve H is completely inclined and moves to the horizontal plane, and the main valve H is completely opened. Further, the first coupling 10 and the second coupling 51 of the changeover switch idling mechanism 40 are engaged, and the movable contact SM is connected via the insulating shaft 53 and the current collecting ring S0 of the movable portion 50 of the changeover switch S. And rotate (FIGS. 63E to 63G).

駆動軸２の回転が続き、図６４（ｂ）に示すように抵抗バルブＷ２のカムフォロア２１がカム溝５ａの傾斜を下りきると、図６４（ｅ）のように切換スイッチＳの可動接点ＳＭは固定接点Ｓ１から離れる。   When the drive shaft 2 continues to rotate and the cam follower 21 of the resistance valve W2 moves down the cam groove 5a as shown in FIG. 64 (b), the movable contact SM of the changeover switch S is fixed as shown in FIG. 64 (e). Move away from the contact S1.

その後、図６５（ｂ）に示すように真空バルブＷ１のカムフォロア２１がカム溝５ｂの傾斜を上がり、抵抗バルブＷ１が開極する。このとき、主バルブＨは開、抵抗バルブＷ２は閉の状態にある。   Thereafter, as shown in FIG. 65 (b), the cam follower 21 of the vacuum valve W1 increases the inclination of the cam groove 5b, and the resistance valve W1 opens. At this time, the main valve H is open and the resistance valve W2 is closed.

次に切換スイッチＳの可動接点ＳＭが図６６（ｅ）に示すように固定接点Ｓ２と接触する。このとき、主バルブＨは図６６（ｂ）に示すように開、抵抗バルブＷ１は開、抵抗バルブＷ２が閉の状態にある。   Next, the movable contact SM of the changeover switch S comes into contact with the fixed contact S2 as shown in FIG. 66 (e). At this time, as shown in FIG. 66B, the main valve H is open, the resistance valve W1 is open, and the resistance valve W2 is closed.

また、駆動軸２がカム５を回転させると、図６７（ｂ）に示すように主バルブＨのカムフォロア２１はカム溝５ｃの傾斜を下り、閉極する。このとき、切換スイッチＳの可動接点ＳＭは完全に固定接点Ｓ２と接触しているが、通電接点ＣＳの可動接点ＣＳＭはまだ固定接点ＣＳ２に接触していない状態にある（図６７（ｃ）、（ｅ））。   When the drive shaft 2 rotates the cam 5, the cam follower 21 of the main valve H descends the cam groove 5c as shown in FIG. At this time, the movable contact SM of the changeover switch S is completely in contact with the fixed contact S2, but the movable contact CSM of the energizing contact CS is not yet in contact with the fixed contact CS2 (FIG. 67 (c)). (E)).

さらに、駆動軸２の回転が進むと、図６８（ｃ）に示すように通電接点ＣＳの可動接点ＣＳＭが完全に固定接点ＣＳ２と接触状態になり、切換が完了し、タップＴ２による運転状態となる。このとき、主バルブＨは図６７（ｂ）に示すように閉、抵抗バルブＷ１は開、抵抗バルブＷ２は閉の状態である。   Further, when the rotation of the drive shaft 2 proceeds, as shown in FIG. 68 (c), the movable contact CSM of the energizing contact CS is completely brought into contact with the fixed contact CS2, the switching is completed, and the operation state by the tap T2 is changed. Become. At this time, as shown in FIG. 67B, the main valve H is closed, the resistance valve W1 is opened, and the resistance valve W2 is closed.

以上の説明はタップＴ１からＴ２への切換動作であるが、タップＴ２からＴ１への切換は前述と逆動作となるだけなので、ここではその説明を省略する。   The above description is the switching operation from the tap T1 to T2, but the switching from the tap T2 to T1 is only the reverse operation to that described above, so the description thereof is omitted here.

このように本発明の第４の実施形態では、真空バルブ開閉機構３０は、真空バルブに開閉動作を伝達するカム５を中心にその外周に３相各相に対応する真空バルブを円周方向に等間隔に配置し、カム５の下方に切換スイッチＳと通電接点ＣＳの各々の回転部および接続導体ＮＢを駆動軸と同軸的に取付ける構成としたので、デッドスペースを有効に活用でき、コンパクトな配置が可能であるとともに、駆動軸２と、カム５、切換スイッチＳ、通電接点ＣＳすべてを同軸で駆動するため、複雑な機構とならずに２抵抗３バルブ切換方式の安定した切換シーケンスを得ることができる。   As described above, in the fourth embodiment of the present invention, the vacuum valve opening / closing mechanism 30 has the cams 5 that transmit the opening / closing operation to the vacuum valves as the center, and the vacuum valves corresponding to the three phases on the outer periphery thereof in the circumferential direction. Since the rotating parts of the changeover switch S and the energizing contact CS and the connection conductor NB are coaxially attached to the drive shaft below the cam 5, the dead space can be effectively utilized and the compact The drive shaft 2, the cam 5, the changeover switch S, and the energizing contact CS are all driven coaxially, so that a stable switching sequence of the two-resistance three-valve switching method can be obtained without using a complicated mechanism. be able to.

すなわち、第１及び第２の実施形態では、真空バルブから中性点の接続導体ＮＢを設置するスペースを確保するため、真空バルブ間の距離を長くするか、真空バルブの外側に接続導体ＮＢを配置する必要があり、その結果、切換開閉器が大型化してしまうが、上述したように接続導体ＮＢを駆動軸と同軸的に取付けることで、デッドスペースを有効に活用することができる。したがって、大容量化に伴って真空バルブのサイズが大きくなっても切換開閉器全体をコンパクトにまとめた構成とすることができる。   That is, in the first and second embodiments, in order to secure a space for installing the neutral connection conductor NB from the vacuum valve, the distance between the vacuum valves is increased, or the connection conductor NB is provided outside the vacuum valve. As a result, it is necessary to dispose the switching switch, but the dead space can be effectively utilized by attaching the connection conductor NB coaxially to the drive shaft as described above. Therefore, even if the size of the vacuum valve increases with an increase in capacity, the entire switching switch can be made compact.

また、接続導体ＮＢに黄銅あるいは青銅を用いた場合、通電能力だけでなく、機械的強度に優れているため、接続導体ＮＢをコンパクトにすることができる。   In addition, when brass or bronze is used for the connection conductor NB, the connection conductor NB can be made compact because of excellent mechanical strength as well as current-carrying capacity.

以上のことから本発明の第４の実施形態によれば、２抵抗３バルブ切換方式を用いた安定した通電と切換動作を実現するコンパクトな切換開閉器を提供することができる。   As described above, according to the fourth embodiment of the present invention, it is possible to provide a compact switching switch that realizes stable energization and switching operation using the 2-resistance 3-valve switching system.

（第５の実施形態）
図６９は、本発明の第５の実施形態における接続導体ＮＢの構成図である。 (Fifth embodiment)
FIG. 69 is a configuration diagram of the connection conductor NB in the fifth embodiment of the present invention.

本実施形態では、図６９（ａ），（ｂ）に示すように真空バルブと中性点を接続する導体ＮＢの外周に冷却用溝ＲＳを設けたものである。この接続導体ＮＢの上端部には通電接点ＣＳの集電リングＮＳＯが、下端部には通電接点ＣＳの可動接点ＣＳＭが設けられている。   In the present embodiment, as shown in FIGS. 69A and 69B, a cooling groove RS is provided on the outer periphery of the conductor NB connecting the vacuum valve and the neutral point. A current collecting ring NSO of the energizing contact CS is provided at the upper end portion of the connection conductor NB, and a movable contact CSM of the energizing contact CS is provided at the lower end portion.

このように接続導体ＮＳに冷却用溝ＲＳを設けることにより、接続導体ＮＳの材料選定には、通電能力より機械的強度を重視することができる。   By providing the cooling groove RS in the connection conductor NS in this way, the mechanical strength can be regarded as more important than the energization capability in selecting the material of the connection conductor NS.

また、このような構成の接続導体ＮＳを第４の実施実施の通電接点を設けた切換開閉器に適用した場合、接続導体として機械的強度が高く、導電率が低い材料を選定しても、接続導体はタップ切換時のみ通電し、常時の運転状態では通電接点のみの通電となるので、タップ切換時の短時間通電に対する冷却効果を得ることができる。これにより、接続導体ＮＢをコンパクトにすることができる。   Further, when the connection conductor NS having such a configuration is applied to the switching switch provided with the energization contact of the fourth embodiment, even if a material having high mechanical strength and low conductivity is selected as the connection conductor, Since the connection conductor is energized only when the tap is switched, and only the energizing contact is energized in the normal operation state, a cooling effect can be obtained for a short-time energization when the tap is switched. Thereby, the connection conductor NB can be made compact.

以上のように本発明の第５の実施形態によれば、２抵抗３バルブ切換方式を用いた安定した通電と切換動作を実現できるコンパクトな切換開閉器を提供できる。   As described above, according to the fifth embodiment of the present invention, it is possible to provide a compact switching switch that can realize stable energization and switching operation using the 2-resistance 3-valve switching system.

本発明による負荷時タップ切換器の第１の実施形態を示す回路図。1 is a circuit diagram showing a first embodiment of a load tap changer according to the present invention; FIG. （ａ），（ｂ）は同実施形態における切換開閉器のシーケンス図。(A), (b) is a sequence diagram of the switching switch in the embodiment. 同実施形態における切換開閉器の断面図。Sectional drawing of the switching switch in the embodiment. （ａ），（ｂ）は同実施形態における真空バルブ開閉機構を拡大して示す正面図及び側面図。(A), (b) is the front view and side view which expand and show the vacuum valve opening / closing mechanism in the embodiment. 図３のＡ−Ａ線に沿う矢視断面図。FIG. 4 is a cross-sectional view taken along line AA in FIG. 3. 図３のＢ−Ｂ線に沿う矢視断面図。FIG. 4 is a cross-sectional view taken along line B-B in FIG. 3. 図３のＣ−Ｃ線に沿う矢視断面図。FIG. 4 is a cross-sectional view taken along line CC in FIG. 3. 図３のＤ−Ｄ線に沿う矢視断面図。FIG. 4 is a cross-sectional view taken along line DD in FIG. 3. （ａ），（ｂ）は同実施形態における各可動接点に用いるスライド接点の詳細図。(A), (b) is detail drawing of the slide contact used for each movable contact in the embodiment. （ａ），（ｂ）は同実施形態における切換開閉器のタップＴ１，Ｔ２正規運転時の切換回路およびカム溝と真空バルブ開閉関係を示した図。(A), (b) is the figure which showed the switching circuit at the time of regular operation of tap T1, T2 of the switching switch in the same embodiment, a cam groove, and a vacuum valve opening / closing relationship. （ａ）〜（ｅ）は図１（イ）における切換開閉器の各部の切換動作説明図。(A)-(e) is switching operation | movement explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｅ）は図１（ロ）における切換開閉器の各部の切換動作説明図。(A)-(e) is switching operation explanatory drawing of each part of the switching switch in FIG.1 (b). （ａ）〜（ｅ）は図１（ハ）における切換開閉器の各部の切換動作説明図。(A)-(e) is switching operation | movement explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｅ）は図１（ニ）における切換開閉器の各部の切換動作説明図。(A)-(e) is switching operation | movement explanatory drawing of each part of the switching switch in FIG.1 (d). （ａ）〜（ｅ）は図１（ホ）における切換開閉器の各部の切換動作説明図。(A)-(e) is switching operation | movement explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｅ）は図１（ヘ）における切換開閉器の各部の切換動作説明図。(A)-(e) is switching operation | movement explanatory drawing of each part of the switching switch in FIG.1 (f). （ａ）〜（ｅ）は図１（ト）における切換開閉器の各部の切換動作説明図。(A)-(e) is switching operation explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｅ）は切換開閉器の切換完了時における各部の状態説明図。(A)-(e) is a state explanatory drawing of each part at the time of the completion of switching of a switching switch. 本発明による負荷時タップ切換器の第２の実施形態を示す回路図。The circuit diagram which shows 2nd Embodiment of the tap changer at the time of load by this invention. （ａ），（ｂ）は同実施形態における切換開閉器のシーケンス図。(A), (b) is a sequence diagram of the switching switch in the embodiment. 同実施形態における切換開閉器の断面図。Sectional drawing of the switching switch in the embodiment. 図２１におけるＥ−Ｅ線に沿う矢視断面図。FIG. 22 is a cross-sectional view taken along line EE in FIG. 21. （ａ），（ｂ）は同実施形態における切換開閉器のタップＴ１，Ｔ２正規運転時の切換回路およびカム溝と真空バルブ開閉関係を示した図。(A), (b) is the figure which showed the switching circuit at the time of regular operation of tap T1, T2 of the switching switch in the same embodiment, a cam groove, and a vacuum valve opening / closing relationship. （ａ）〜（ｆ）は図１９（イ）における切換開閉器の各部の切換動作説明図。(A)-(f) is switching operation explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｆ）は図１９（ロ）における切換開閉器の各部の切換動作説明図。(A)-(f) is a switching operation | movement explanatory drawing of each part of the switching switch in FIG.19 (b). （ａ）〜（ｆ）は図１９（ハ）における切換開閉器の各部の切換動作説明図。(A)-(f) is a switching operation | movement explanatory drawing of each part of the switching switch in FIG.19 (c). （ａ）〜（ｆ）は図１９（ニ）における切換開閉器の各部の切換動作説明図。(A)-(f) is switching operation explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｆ）は図１９（ホ）における切換開閉器の各部の切換動作説明図。(A)-(f) is switching operation explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｆ）は図１９（ヘ）における切換開閉器の各部の切換動作説明図。(A)-(f) is switching operation explanatory drawing of each part of the switching switch in FIG.19 (f). （ａ）〜（ｆ）は図１９（ト）における切換開閉器の各部の切換動作説明図。(A)-(f) is switching operation explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｆ）は図１９（チ）における切換開閉器の各部の切換動作説明図。(A)-(f) is switching operation explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｆ）は図１９（リ）における切換開閉器の各部の切換動作説明図。(A)-(f) is switching operation explanatory drawing of each part of the switching switch in FIG. 本発明による負荷時タップ切換器の第３の実施形態を示す回路図。The circuit diagram which shows 3rd Embodiment of the tap switch at the time of load by this invention. 同実施形態における切換開閉器の断面図。Sectional drawing of the switching switch in the embodiment. 図３４におけるＡ−Ａ線に沿う矢視断面図。FIG. 35 is a cross-sectional view taken along line AA in FIG. 図３４におけるＢ−Ｂ線に沿う矢視断面図。The arrow directional cross-sectional view which follows the BB line in FIG. 図３４におけるＣ−Ｃ線に沿う矢視断面図。FIG. 35 is a cross-sectional view taken along the line CC in FIG. 図３４におけるＤ−Ｄ線に沿う矢視断面図。FIG. 35 is a cross-sectional view taken along the line DD in FIG. 図３４におけるＥ−Ｅ線に沿う矢視断面図。The arrow directional cross-sectional view which follows the EE line in FIG. 図３４におけるＦ−Ｆ線に沿う矢視断面図。FIG. 35 is a cross-sectional view taken along the line FF in FIG. 34. （ａ），（ｂ）は同実施形態における切換開閉器のタップＴ１，Ｔ２正規運転時の切換回路およびカム溝と真空バルブ開閉関係を示した図。(A), (b) is the figure which showed the switching circuit at the time of regular operation of tap T1, T2 of the switching switch in the same embodiment, a cam groove, and a vacuum valve opening / closing relationship. （ａ）〜（ｇ）は図３３（イ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation | movement explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｇ）は図３３（ロ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation | movement explanatory drawing of each part of the switching switch in FIG.33 (b). （ａ）〜（ｇ）は図３３（ハ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation | movement explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｇ）は図３３（ニ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation | movement explanatory drawing of each part of the switching switch in FIG.33 (d). （ａ）〜（ｇ）は図３３（ホ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation explanatory drawing of each part of the switching switch in FIG. 33 (e). （ａ）〜（ｇ）は図３３（ヘ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation explanatory drawing of each part of the switching switch in FIG.33 (f). （ａ）〜（ｇ）は図３３（ト）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation | movement explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｇ）は図３３（チ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｇ）は図３３（リ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation | movement explanatory drawing of each part of the switching switch in FIG. 本発明による負荷時タップ切換器の第４の実施形態を示す断面図。Sectional drawing which shows 4th Embodiment of the tap changer at the time of loading by this invention. （ａ），（ｂ）は同実施形態における真空バルブ開閉機構を拡大して示す正面図及び側面図。(A), (b) is the front view and side view which expand and show the vacuum valve opening / closing mechanism in the embodiment. 図５１におけるＡ−Ａ線に沿う矢視断面図。FIG. 52 is a cross-sectional view taken along line AA in FIG. 51. 図５１におけるＢ−Ｂ線に沿う矢視断面図。FIG. 52 is a cross-sectional view taken along line B-B in FIG. 51. 図５１におけるＣ−Ｃ線に沿う矢視断面図。FIG. 52 is a cross-sectional view taken along line CC in FIG. 51. 図５１におけるＤ−Ｄ線に沿う矢視断面図。FIG. 52 is a cross-sectional view taken along line DD in FIG. 51. 図５１におけるＥ−Ｅ線に沿う矢視断面図。FIG. 52 is a cross-sectional view taken along the line EE in FIG. 51. 図５１におけるＦ−Ｆ線に沿う矢視断面図。FIG. 52 is a cross-sectional view taken along line FF in FIG. 51. （ａ），（ｂ）は同実施形態における切換開閉器のタップＴ１，Ｔ２正規運転時の切換回路およびカム溝と真空バルブ開閉関係を示した図。(A), (b) is the figure which showed the switching circuit at the time of regular operation of tap T1, T2 of the switching switch in the same embodiment, a cam groove, and a vacuum valve opening / closing relationship. （ａ）〜（ｇ）は図３３（イ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation | movement explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｇ）は図３３（ロ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation | movement explanatory drawing of each part of the switching switch in FIG.33 (b). （ａ）〜（ｇ）は図３３（ハ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation | movement explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｇ）は図３３（ニ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation | movement explanatory drawing of each part of the switching switch in FIG.33 (d). （ａ）〜（ｇ）は図３３（ホ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation explanatory drawing of each part of the switching switch in FIG. 33 (e). （ａ）〜（ｇ）は図３３（ヘ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation explanatory drawing of each part of the switching switch in FIG.33 (f). （ａ）〜（ｇ）は図３３（ト）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation | movement explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｇ）は図３３（チ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation explanatory drawing of each part of the switching switch in FIG. （ａ）〜（ｇ）は図３３（リ）における切換開閉器の各部の切換動作説明図。(A)-(g) is switching operation | movement explanatory drawing of each part of the switching switch in FIG. （ａ），（ｂ）は本発明の第４の実施形態における接続導体を示す正面図及びそのＡ−Ａ線に沿う矢視断面図。(A), (b) is a front view which shows the connection conductor in the 4th Embodiment of this invention, and arrow sectional drawing which follows the AA line.

符号の説明Explanation of symbols

１… 蓄勢装置、２…駆動軸、３…上部プレート、３ａ…ベアリング、４，６…下部プレート、４ａ，６ａ…ベアリング、５…カム、５ａ，５ｂ…カム溝、１０…第１のカップリング、１１…連結キー、１２…連結キー、２０…駆動ボス、２１…カムフォロア、２３… 可撓導線、２４…開閉ボス、２５…ワイプバネ、２８…直進ガイド、２９…案内棒、３０ …真空バルブ開閉機構、３１…真空バルブ可動接点、３２…真空バルブ固定接点、４０…切換スイッチ空転機構、５０…切換スイッチ可動部、５１…第２のカップリング、５１ａ…凹溝（空転部）、５３…絶縁軸、６１…可撓銅箔、６２…板ばね、６３…通電座金、６４…接点、７０…スライド接点、７１…通電台、８０…通電接点の可動部、９１…接点台、９２…接点台、１００…連結キー、１２３…可撓導線、ＣＳ…通電接点、ＣＳ１，ＣＳ２…通電接点の固定接点、ＣＳＭ…通電接点の可動接点、Ｈ…主バルブ、ＩＣ…循環電流、ＩＬ…負荷電流、Ｍ１，Ｍ２…タップ選択器の可動接点、Ｍ１Ｐ，Ｍ２Ｐ…端子、Ｎ…中性点、Ｎ１…中性点接点台、ＮＢ…接続導体、ＮＰ…中性点端子、ＮＰＣ…中性点プレート、ＮＲ…中性点リング、ＮＳ０…通電接点の集電リング、Ｒ１，Ｒ２…限流抵抗、Ｓ…切換スイッチ、Ｓ１，Ｓ２…切換スイッチの固定接点、ＳＭ…切換スイッチの可動接点、Ｓ０…切換スイッチの集電リング、ＴＷ…タップ巻線、Ｗ１，Ｗ２…抵抗バルブ、θ…空転角度   DESCRIPTION OF SYMBOLS 1 ... Accumulation apparatus, 2 ... Drive shaft, 3 ... Upper plate, 3a ... Bearing, 4, 6 ... Lower plate, 4a, 6a ... Bearing, 5 ... Cam, 5a, 5b ... Cam groove, 10 ... 1st cup Ring 11, connecting key 12, connecting key 20 drive boss 21 cam follower 23 flexible conductor 24 opening / closing boss 25 wipe spring 28 straight drive guide 29 guide rod 30 vacuum valve Opening / closing mechanism, 31 ... Vacuum valve movable contact, 32 ... Vacuum valve fixed contact, 40 ... Changeover switch idling mechanism, 50 ... Changeover switch movable part, 51 ... Second coupling, 51a ... Dove groove (idling part), 53 ... Insulating shaft, 61 ... flexible copper foil, 62 ... leaf spring, 63 ... energizing washer, 64 ... contact, 70 ... slide contact, 71 ... energizing base, 80 ... movable part of energizing contact, 91 ... contact base, 92 ... contact Stand, 00 ... Connection key, 123 ... Flexible lead, CS ... Current contact, CS1, CS2 ... Current contact fixed contact, CSM ... Current contact movable contact, H ... Main valve, IC ... Circulating current, IL ... Load current, M1 M2 ... Tap selector movable contact, M1P, M2P ... terminal, N ... neutral point, N1 ... neutral point contact block, NB ... connecting conductor, NP ... neutral point terminal, NPC ... neutral point plate, NR ... Neutral point ring, NS0 ... Current collecting ring for energizing contact, R1, R2 ... Current limiting resistance, S ... Changeover switch, S1, S2 ... Fixed contact for changeover switch, SM ... Moving contact for changeover switch, S0 ... Changeover switch Current collecting ring, TW: tap winding, W1, W2: resistance valve, θ: idling angle

Claims (7)

タップ巻線のタップを選択する２個の可動接点を有するタップ選択器の前記各可動接点と変圧器の中性点との間にそれぞれ直列に接続して設けられた限流抵抗及び真空バルブからなる抵抗バルブと、
前記タップ選択器の各々の前記可動接点と前記限流抵抗との間にそれぞれ設けた固定接点と該固定接点の一方を選択する可動接点からなる切換スイッチと、
この切換スイッチの可動接点と前記中性点との間に接続された真空バルブからなる主バルブと、
からなる負荷時タップ切換器において、
鉛直に設けられ、蓄勢装置により回動駆動される駆動軸と、
この駆動軸の下端部に取付けられ、前記駆動軸の回動により前記抵抗バルブ及び主バルブを所定の順序で開閉させるカムと、
このカムの外周部に前記駆動軸と平行に配置された抵抗バルブ及び主バルブに直結して設けられ、前記カムの回動により軸方向に作動して前記抵抗バルブ及び主バルブを開閉動作させる作動部を備えた真空バルブ開閉機構と、
前記駆動軸と同軸的に且つ前記カムの上方に配置され、前記駆動軸の動作に連動して前記切換スイッチの可動接点を駆動する可動部と
を備えたことを特徴とする負荷時タップ切換器。 From a current limiting resistor and a vacuum valve provided in series between the movable contacts of the tap selector having two movable contacts for selecting the tap of the tap winding and the neutral point of the transformer, respectively. A resistance valve,
A changeover switch comprising a fixed contact provided between the movable contact of each of the tap selectors and the current limiting resistor, and a movable contact for selecting one of the fixed contacts;
A main valve consisting of a vacuum valve connected between the movable contact of the changeover switch and the neutral point;
In the load tap changer consisting of
A drive shaft provided vertically and driven to rotate by the energy storage device;
A cam attached to the lower end of the drive shaft, and opening and closing the resistance valve and the main valve in a predetermined order by rotation of the drive shaft;
The cam is directly connected to the resistance valve and the main valve arranged in parallel with the drive shaft on the outer periphery of the cam, and is operated in the axial direction by the rotation of the cam to open and close the resistance valve and the main valve. A vacuum valve opening and closing mechanism with a section,
A load tap changer comprising: a movable portion that is disposed coaxially with the drive shaft and above the cam and that drives a movable contact of the changeover switch in conjunction with the operation of the drive shaft. . 請求項１記載の負荷時タップ切換器において、
前記タップ巻線のタップを選択するタップ選択器の２個の可動接点と限流抵抗との間に、前記切換スイッチの固定接点と並列に接続される第２の固定接点と前記中性点に接続され、且つ前記第２の固定接点の一方を選択する第２の可動接点とを備えた通電接点を設け、
この通電接点の第２の固定接点を前記切換スイッチの固定接点の上方に配置し、
前記第２の可動接点を前記駆動軸と同軸的に且つ前記駆動軸の動作により駆動されるように配置する
ことを特徴とする負荷時タップ切換器。 The on-load tap changer according to claim 1,
A second fixed contact connected in parallel with the fixed contact of the changeover switch and the neutral point between the two movable contacts of the tap selector for selecting the tap of the tap winding and the current limiting resistor. An energized contact provided with a second movable contact that is connected and selects one of the second fixed contacts;
The second fixed contact of the energizing contact is disposed above the fixed contact of the changeover switch,
The on-load tap changer, wherein the second movable contact is arranged coaxially with the drive shaft and driven by the operation of the drive shaft. 請求項１または請求項２記載の負荷時タップ切換器において、
前記各真空バルブと中性点あるいは前記通電接点とを接続する導体が、前記駆動軸と同軸的に配置されたことを特徴とする負荷時タップ切換器。 The on-load tap changer according to claim 1 or 2,
A load tap changer characterized in that a conductor connecting each vacuum valve and a neutral point or the energizing contact is arranged coaxially with the drive shaft. タップ巻線のタップを選択する２個の可動接点を有するタップ選択器の前記各可動接点と変圧器の中性点との間にそれぞれ直列に接続して設けられた限流抵抗及び真空バルブからなる抵抗バルブと、
各々の前記可動接点と前記限流抵抗との間にそれぞれ設けた固定接点と該固定接点の一方を選択する可動接点からなる切換スイッチと、
この切換スイッチの可動接点と前記中性点との間に接続された真空バルブからなる主バルブと、
からなる負荷時タップ切換器において、
鉛直に設けられ、蓄勢装置により回動駆動される駆動軸と、
この駆動軸の上部に取付けられ、前記駆動軸の回動により前記抵抗バルブ及び主バルブを所定の順序で開閉させるカムと、
このカムの外周部に前記駆動軸と平行に配置された抵抗バルブ及び主バルブに直結して設けられ、前記カムの回動により軸方向に作動して前記抵抗バルブ及び主バルブを開閉動作させる作動部を備えた真空バルブ開閉機構と、
前記駆動軸と同軸的に且つ前記カムの下方に配置され、前記駆動軸の動作に連動して前記切換スイッチの可動接点を駆動する可動部と、
前記切変スイッチの可動部の外周上に配置した固定接点と、
を備え、
前記前記抵抗バルブ及び主バルブと前記中性点を接続する導体を前記駆動軸と同軸的に配置したことを特徴とする負荷時タップ切換器。 From a current limiting resistor and a vacuum valve provided in series between the movable contacts of the tap selector having two movable contacts for selecting the tap of the tap winding and the neutral point of the transformer, respectively. A resistance valve,
A changeover switch comprising a fixed contact provided between each of the movable contacts and the current limiting resistor, and a movable contact for selecting one of the fixed contacts;
A main valve comprising a vacuum valve connected between the movable contact of the changeover switch and the neutral point;
In the load tap changer consisting of
A drive shaft provided vertically and driven to rotate by the energy storage device;
A cam attached to an upper portion of the drive shaft and configured to open and close the resistance valve and the main valve in a predetermined order by rotating the drive shaft;
The cam is directly connected to the resistance valve and the main valve arranged in parallel with the drive shaft on the outer periphery of the cam, and is operated in the axial direction by the rotation of the cam to open and close the resistance valve and the main valve. A vacuum valve opening and closing mechanism with a section,
A movable part that is arranged coaxially with the drive shaft and below the cam, and that drives the movable contact of the changeover switch in conjunction with the operation of the drive shaft;
A fixed contact disposed on the outer periphery of the movable portion of the switch switch;
With
A load tap changer characterized in that a conductor connecting the resistance valve and the main valve and the neutral point is arranged coaxially with the drive shaft. 請求項４記載の負荷時タップ切換器において、
前記タップ巻線のタップを選択するタップ選択器の２個の可動接点と限流抵抗との間に、前記切換スイッチの固定接点と並列に接続される第２の固定接点と前記中性点に接続され、且つ前記第２の固定接点の一方を選択する第２の可動接点とを備えた通電接点を設け、
この通電接点の第２の固定接点を前記切換スイッチの固定接点の下方に配置し、
前記第２の可動接点を前記駆動軸と同軸的に且つ前記駆動軸の動作により駆動されるように配置する
ことを特徴とする負荷時タップ切換器。 The on-load tap changer according to claim 4,
A second fixed contact connected in parallel with the fixed contact of the changeover switch and the neutral point between the two movable contacts of the tap selector for selecting the tap of the tap winding and the current limiting resistor. An energized contact provided with a second movable contact that is connected and selects one of the second fixed contacts;
The second fixed contact of the energizing contact is arranged below the fixed contact of the changeover switch,
The on-load tap changer, wherein the second movable contact is arranged coaxially with the drive shaft and driven by the operation of the drive shaft. 請求項３乃至請求項５のいずれかに記載の負荷時タップ切換器において、
前記真空バルブと中性点を接続する導体に黄銅あるいは青銅を用いたことを特徴とする負荷時タップ切換器。 In the on-load tap changer according to any one of claims 3 to 5,
An on-load tap changer using brass or bronze as a conductor connecting the vacuum valve and a neutral point. 請求項３乃至請求項６のいずれかに記載の負荷時タップ切換器において、
前記真空バルブと中性点を接続する導体に冷却用フィンあるいは冷却用溝を設けたことを特徴とする負荷時タップ切換器。 In the on-load tap changer according to any one of claims 3 to 6,
An on-load tap changer characterized in that a cooling fin or a cooling groove is provided in a conductor connecting the vacuum valve and a neutral point.
JP2006322068A 2006-11-29 2006-11-29 Load tap changer Expired - Fee Related JP4764318B2 (en)

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
WO2011157316A1 (en) * 2010-06-18 2011-12-22 Maschinenfabrik Reinhausen Gmbh On-load tap changer
KR20120005435A (en) * 2009-04-09 2012-01-16 마쉬넨파브릭 레인하우센 게엠베하 On-load tap changer comprising semiconductor switching elements
JP2013519996A (en) * 2010-02-11 2013-05-30 マシイネンフアブリーク・ラインハウゼン・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Tap changer with freewheel parts
TWI487839B (en) * 2013-05-14 2015-06-11 King Yuan Electronics Co Ltd A rotary cam type vacuum switching module
KR101802262B1 (en) 2010-05-08 2017-11-28 마쉬넨파브릭 레인하우센 게엠베하 On-load tap changer
CN108682548A (en) * 2018-05-11 2018-10-19 吴江远洋电气有限责任公司 One kind being conveniently replaceable on-load tap-changer of transformer device
CN113874969A (en) * 2019-05-30 2021-12-31 株式会社东芝 Switching switch of load tap changer and load tap changer

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JP2001217130A (en) * 2000-01-31 2001-08-10 Toshiba Corp On-load tap changer

Cited By (10)

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Publication number Priority date Publication date Assignee Title
KR20120005435A (en) * 2009-04-09 2012-01-16 마쉬넨파브릭 레인하우센 게엠베하 On-load tap changer comprising semiconductor switching elements
KR101643214B1 (en) 2009-04-09 2016-08-10 마쉬넨파브릭 레인하우센 게엠베하 On-load tap changer comprising semiconductor switching elements
JP2013519996A (en) * 2010-02-11 2013-05-30 マシイネンフアブリーク・ラインハウゼン・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Tap changer with freewheel parts
KR101749197B1 (en) 2010-02-11 2017-07-03 마쉬넨파브릭 레인하우센 게엠베하 Stepping switch having a freewheel element
KR101802262B1 (en) 2010-05-08 2017-11-28 마쉬넨파브릭 레인하우센 게엠베하 On-load tap changer
WO2011157316A1 (en) * 2010-06-18 2011-12-22 Maschinenfabrik Reinhausen Gmbh On-load tap changer
CN102947902A (en) * 2010-06-18 2013-02-27 赖茵豪森机械制造公司 On-load tap changer
TWI487839B (en) * 2013-05-14 2015-06-11 King Yuan Electronics Co Ltd A rotary cam type vacuum switching module
CN108682548A (en) * 2018-05-11 2018-10-19 吴江远洋电气有限责任公司 One kind being conveniently replaceable on-load tap-changer of transformer device
CN113874969A (en) * 2019-05-30 2021-12-31 株式会社东芝 Switching switch of load tap changer and load tap changer

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