JP2014127415A - Dc switch - Google Patents

Dc switch Download PDF

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JP2014127415A
JP2014127415A JP2012285085A JP2012285085A JP2014127415A JP 2014127415 A JP2014127415 A JP 2014127415A JP 2012285085 A JP2012285085 A JP 2012285085A JP 2012285085 A JP2012285085 A JP 2012285085A JP 2014127415 A JP2014127415 A JP 2014127415A
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contact
movable contact
auxiliary electrode
arc discharge
permanent magnet
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JP6105283B2 (en
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Akikuni Kato
彰訓 加藤
Kazuki Ito
和記 伊藤
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Kawamura Electric Inc
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  • Arc-Extinguishing Devices That Are Switches (AREA)
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Abstract

PROBLEM TO BE SOLVED: To provide a DC switch capable of shortening the distance between contact points in a configuration in which an arc discharge is extinguished with use of a permanent magnet.SOLUTION: A DC switch includes: a permanent magnet 4 arranged with respect to an opening/closing space v in which contact and separation operation of a movable contact point 2 is performed so that a magnetic field is formed in the direction orthogonal to the moving direction of the movable contact point 2; and an auxiliary electrode 3 which is coupled to a fixed contactor 1a via a capacitor C and a parallel circuit of a resistor R and has the length covering from the vicinity of the separated movable contact point 2 to the vicinity of the a fixed contact point 1. The permanent magnet 4 is arranged so that an arc discharge generated when the movable contact point 2 is made to perform separating operation is extended in the direction of the auxiliary electrode 3 and forms a magnetic field E1.

Description

本発明は、直流電路を開閉操作する直流開閉器に関する。
に関する。 The present invention relates to a DC switch that opens and closes a DC circuit.
About.

省エネルギーの観点から、また産業用太陽光発電の普及による発電電圧の高電圧化等から、直流高電圧配電（ＨＶＤＣ）が検討されている。
しかしながら、給電電圧が高くなると電路を開放する際に接点間にアーク放電が生じ易く、また消え難くなる。特に直流の場合、一度発生したアーク放電は消え難いため、開閉器においては交流に比べて消弧対策が重要となる。これは、交流では直流と異なり周期的に０Ｖの電位があるため発生したアーク放電は切れやすいが、直流では常に一定の電圧が加わることで一度発生したアークは他の条件が変わらない限り切れない特性に依る。
そのため、直流電路に設置される開閉器には、開閉する接点を挟むように永久磁石を配置して、磁力によりアーク放電の形成経路を強制的に変更して消弧を促進させるよう構成したものがある。例えば特許文献１では、開極の際に生ずるアーク放電を挟むように永久磁石を対向させて配置すると共に、アーク放電の橋絡を阻止する消弧絶縁板を配置して、発生したアーク放電を強制的に特定方向に伸張させることで比較的大電流でも遮断できるよう構成している。 Direct current high voltage distribution (HVDC) has been studied from the viewpoint of energy saving and from the viewpoint of increasing the generated voltage by the spread of industrial solar power generation.
However, when the power supply voltage becomes high, arc discharge is likely to occur between the contacts when the circuit is opened, and it is difficult to eliminate. In particular, in the case of direct current, arc discharge once generated is difficult to extinguish. Therefore, in a switch, countermeasures for extinguishing arcs are more important than alternating current. This is because, unlike alternating current, direct current has a potential of 0V, and arc discharge that occurs is easily cut off. In direct current, a constant voltage is always applied, and once generated arc does not break unless other conditions are changed. Depends on characteristics.
For this reason, the switch installed in the DC circuit has a permanent magnet placed so as to sandwich the contact to open and close, and the arc discharge formation path is forcibly changed by magnetic force to promote arc extinction. There is. For example, in Patent Document 1, permanent magnets are arranged to face each other so as to sandwich arc discharge generated at the time of opening, and an arc extinguishing insulating plate that prevents bridging of arc discharge is arranged so that generated arc discharge is prevented. It is configured so that it can be cut off even with a relatively large current by forcibly extending in a specific direction.

特許第３３３４５２０号公報Japanese Patent No. 3334520

上記永久磁石を消弧室周囲に設置したものは、比較的大電流が流れる電路に対しても有効な構成であった。しかしながら、アーク放電を確実に消弧させるためには、解離させた固定接点と可動接点との距離をある程度大きな間隔とする必要があり、開閉器の小型化を進める場合、この接点間距離を小さくできる構成が望まれていた。   What installed the said permanent magnet around the arc-extinguishing chamber was a structure effective also with respect to the electric circuit through which a comparatively large current flows. However, in order to extinguish arc discharge with certainty, the distance between the disengaged fixed contact and the movable contact must be large to some extent. If the switch is to be downsized, the distance between the contacts must be reduced. A possible configuration was desired.

そこで、本発明はこのような問題点に鑑み、永久磁石を使用して消弧する構成において、接点間距離を短くすることが可能な直流開閉器を提供することを目的としている。   Therefore, in view of such a problem, an object of the present invention is to provide a DC switch capable of shortening the distance between contacts in a configuration in which arcs are extinguished using a permanent magnet.

上記課題を解決する為に、請求項１の発明は、固定接点を備えた固定接触子と可動接点を備えた可動接触子とを電路上に設けて、前記固定接点に対して可動接点を接触／解離動作させることで、前記電路の接続／遮断を実施する直流開閉器であって、前記可動接点が接触／解離動作する開閉空間に対して、前記可動接点の移動方向に直交する方向に磁界が形成されるよう配置した永久磁石と、前記固定接触子、前記可動接触子の何れか一方とコンデンサ及び抵抗の並列回路を介して連結され、解離した前記可動接点近傍から前記固定接点近傍に亘る長さを有する補助電極とを備え、前記可動接点を解離動作させた際に発生するアーク放電が、前記補助電極の方向へ伸張される磁界を形成するよう前記永久磁石を配置したことを特徴とする。
この構成によれば、接点解離時に固定接点と可動接点の間で発生するアーク放電は、磁力により補助電極側に伸張される応力により曲がるため、解離動作の途中で接点間から補助電極と接点の間に移行する。その後は、コンデンサと抵抗の並列回路がアーク放電のエネルギーを吸収するため、良好に消弧させることができる。よって、解離した状態の固定接点と可動接点との距離を従来より短くすることが可能となり、直流開閉器の小型化に寄与する。 In order to solve the above-mentioned problem, the invention of claim 1 provides a fixed contact having a fixed contact and a movable contact having a movable contact on an electric circuit, and contacts the movable contact with the fixed contact. A DC switch that connects / disconnects the electric circuit by performing a dissociation / disconnection operation, and a magnetic field in a direction perpendicular to the moving direction of the movable contact with respect to the open / close space in which the movable contact contacts / dissociates. The permanent magnet is arranged so as to be formed, and either one of the fixed contact and the movable contact is connected to the disengaged movable contact and the fixed contact through a parallel circuit of a capacitor and a resistor. An auxiliary electrode having a length, and the permanent magnet is arranged so that an arc discharge generated when the movable contact is dissociated forms a magnetic field that extends in the direction of the auxiliary electrode. To do.
According to this configuration, the arc discharge generated between the fixed contact and the movable contact at the time of dissociation of the contact bends due to the stress that is extended toward the auxiliary electrode by the magnetic force. Transition between. Thereafter, since the parallel circuit of the capacitor and the resistor absorbs the arc discharge energy, the arc can be extinguished well. Therefore, the distance between the disengaged fixed contact and the movable contact can be made shorter than before, which contributes to the downsizing of the DC switch.

請求項２の発明は、固定接点を備えた固定接触子と可動接点を備えた可動接触子とを電路上に設けて、前記固定接点に対して可動接点を接触／解離動作させることで、前記電路の接続／遮断を実施する直流開閉器であって、前記可動接点が接触／解離動作する開閉空間に対して、前記可動接点の移動方向に略直交する方向に磁界が形成されるよう配置した永久磁石と、前記固定接触子、前記可動接触子の何れか一方とコンデンサ及び抵抗の並列回路を介して連結され、前記固定接点の近傍で前記可動接触子に接触する補助電極とを備え、当該補助電極は、前記可動接触子に接触した状態で前記可動接点の接触／解離動作に連動して移動するよう連携配置される一方、前記可動接点の解離動作の途中で前記補助電極の移動を所定位置で停止させるストッパを備え、前記可動接点を解離動作させた際に発生するアーク放電が、前記補助電極側に伸張される磁界を形成するよう前記永久磁石を配置したことを特徴とする。
この構成によれば、接点解離時に固定接点と可動接点の間で発生するアーク放電は、磁力により補助電極側に伸張される応力により曲がる。一方で、可動接点に連携して移動する補助電極は、途中で停止して可動接触子から離れる。よって、アーク放電は接点解離動作の途中で接点間から補助電極と接点の間に移行する。その後は、コンデンサと抵抗の並列回路がアーク放電のエネルギーを吸収するため、補助電極と可動接触子とが解離しても両者の間でアーク放電が発生することがなく、良好に消弧させることができる。よって、解離した状態の固定接点と可動接点との距離を従来より短くすることが可能となり、直流開閉器の小型化に寄与する。 According to a second aspect of the present invention, a fixed contact provided with a fixed contact and a movable contact provided with a movable contact are provided on an electric circuit, and the movable contact is brought into contact / dissociation operation with respect to the fixed contact. A DC switch for connecting / disconnecting an electric circuit, wherein a magnetic field is formed in a direction substantially perpendicular to a moving direction of the movable contact with respect to an open / close space in which the movable contact is in contact / dissociation. A permanent magnet, and one of the fixed contact and the movable contact connected via a parallel circuit of a capacitor and a resistor, and an auxiliary electrode that contacts the movable contact in the vicinity of the fixed contact, The auxiliary electrode is arranged so as to move in conjunction with the contact / dissociation operation of the movable contact while in contact with the movable contact, while the auxiliary electrode is moved in the middle of the disengagement operation of the movable contact. Stop at position Includes a stopper, the arcing generated when the movable contact dissociated operation, characterized in that a said permanent magnet to form a magnetic field extending in the auxiliary electrode.
According to this configuration, the arc discharge generated between the fixed contact and the movable contact when the contact is dissociated is bent by the stress that is extended toward the auxiliary electrode by the magnetic force. On the other hand, the auxiliary electrode that moves in cooperation with the movable contact stops halfway and leaves the movable contact. Therefore, the arc discharge is transferred from between the contacts to between the auxiliary electrode and the contacts during the contact dissociation operation. After that, since the parallel circuit of the capacitor and the resistor absorbs the arc discharge energy, even if the auxiliary electrode and the movable contact are dissociated, the arc discharge does not occur between them, and the arc should be extinguished well. Can do. Therefore, the distance between the disengaged fixed contact and the movable contact can be made shorter than before, which contributes to the downsizing of the DC switch.

本発明によれば、接点解離時に固定接点と可動接点の間で発生するアーク放電は、磁力により補助電極側に伸張されて曲がるため、解離動作の途中で接点間から補助電極と接点の間に移行する。その後は、コンデンサと抵抗の並列回路がアーク放電のエネルギーを吸収するため、良好に消弧させることができる。よって、解離した状態の固定接点と可動接点との距離を従来より短くすることが可能となり、直流開閉器の小型化に寄与する。   According to the present invention, the arc discharge generated between the fixed contact and the movable contact at the time of dissociation of the contact is extended and bent toward the auxiliary electrode due to the magnetic force. Transition. Thereafter, since the parallel circuit of the capacitor and the resistor absorbs the arc discharge energy, the arc can be extinguished well. Therefore, the distance between the disengaged fixed contact and the movable contact can be made shorter than before, which contributes to downsizing of the DC switch.

本発明に係る直流開閉器の第１の形態を示す接点部の概略構成図であり、（ａ）は接点を解離させた状態の側面説明図、（ｂ）はＡ−Ａ線断面説明図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the contact part which shows the 1st form of the DC switch concerning this invention, (a) is side surface explanatory drawing of the state which made the contact dissociate, (b) is AA sectional view explanatory drawing. is there. 図１の接点の動作説明図であり、（ａ）は解離した直後の状態、（ｂ）は、解離が進み、アーク放電の向きが変化した状態を示している。FIGS. 2A and 2B are operation explanatory diagrams of the contact of FIG. 1, in which FIG. 1A shows a state immediately after dissociation, and FIG. 直流開閉器の第２の形態を示す接点部の概略構成図であり、接点を解離させた状態の説明図である。It is a schematic block diagram of the contact part which shows the 2nd form of direct-current switch, and is explanatory drawing of the state which made the contact dissociate. 図３の接点の動作説明図であり、（ａ）は接触させた状態、（ｂ）は解離した直後の状態、（ｃ）は可動接触子が補助電極から離れた状態を示している。FIG. 4 is an operation explanatory diagram of the contact of FIG. 3, where (a) shows a contact state, (b) shows a state immediately after dissociation, and (c) shows a state in which the movable contact is separated from the auxiliary electrode. 永久磁石の他の配置形態を示す接点部の概略構成図である。It is a schematic block diagram of the contact part which shows the other arrangement | positioning form of a permanent magnet. 永久磁石の他の配置形態を示す接点部の概略構成図である。It is a schematic block diagram of the contact part which shows the other arrangement | positioning form of a permanent magnet.

以下、本発明を具体化した実施の形態を、図面を参照して詳細に説明する。本発明は、アーク放電が発生する空間に永久磁石を配置して磁界を形成するのに加えて、可動接点或いは固定接点の近傍に補助電極を設けて、アークの速やかな消弧を可能とするものである。最初に、補助電極を固定接点及び可動接点の双方に近接させて設けた構成を説明する。   DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below in detail with reference to the drawings. According to the present invention, in addition to forming a magnetic field by arranging a permanent magnet in a space where arc discharge occurs, an auxiliary electrode is provided in the vicinity of a movable contact or a fixed contact to enable quick extinction of the arc. Is. First, a configuration in which the auxiliary electrode is provided close to both the fixed contact and the movable contact will be described.

［第１の形態］
図１は本発明に係る直流開閉器の第１の形態を示す接点部の概略構成図であり、（ａ）は接点を解離させた状態の側面説明図、（ｂ）はＡ−Ａ線断面説明図を示している。図１において、１は固定接触子１ａに設けられた固定接点、２は可動接触子２ａに設けられた可動接点、３は補助電極、４は永久磁石、５は永久磁石４を固着して可動接点２が接触／解離動作する開閉空間Ｖを覆い、開閉空間Ｖに磁界を形成するためにコ字状に形成された継鉄を示している。そして、固定接点１と補助電極３とは並列に配置されたコンデンサＣと抵抗Ｒにより接続されている [First embodiment]
FIG. 1 is a schematic configuration diagram of a contact portion showing a first embodiment of a DC switch according to the present invention, wherein (a) is a side view illustrating a state in which the contact is dissociated, and (b) is a cross-sectional view taken along line AA. An explanatory diagram is shown. In FIG. 1, 1 is a fixed contact provided on the fixed contact 1a, 2 is a movable contact provided on the movable contact 2a, 3 is an auxiliary electrode, 4 is a permanent magnet, and 5 is fixed with a permanent magnet 4 to move. A yoke formed in a U-shape to cover the switching space V in which the contact 2 performs contact / dissociation operation and to form a magnetic field in the switching space V is shown. The fixed contact 1 and the auxiliary electrode 3 are connected by a capacitor C and a resistor R arranged in parallel.

永久磁石４は、図１（ｂ）に示すように、固定接点１及び可動接点２を配置した開閉空間Ｖの側部に両接点に隣接するように配置され、解離した固定接点１と可動接点２の間に一様な磁界が形成されるよう開放された両接点に亘る大きさを備えている。また、ここでは固定接点１から可動接点２に向かって電流が流れるよう両接触子１ａ，２ａは電路に接続されて（固定接点１がプラス極、可動接点２がマイナス極となって）おり、永久磁石４はＳ極を接点１，２側、Ｎ極を継鉄５側として配置されている。   As shown in FIG. 1B, the permanent magnet 4 is disposed adjacent to both contacts at the side of the open / close space V in which the fixed contact 1 and the movable contact 2 are disposed, and the separated fixed contact 1 and the movable contact are separated. Between the two contacts open so that a uniform magnetic field is formed between the two. Also, here, both the contacts 1a, 2a are connected to the electric circuit so that a current flows from the fixed contact 1 to the movable contact 2 (the fixed contact 1 is a positive pole and the movable contact 2 is a negative pole), The permanent magnet 4 is arranged with the S pole as the contact 1 and 2 side and the N pole as the yoke 5 side.

この結果、永久磁石４と継鉄５とで開閉空間Ｖに形成される磁界は、図１（ｂ）の矢印Ｅ１に示す方向で発生し、接点１，２間に発生するアーク放電に対しては、フレミングの左手の法則に基づき図１（ｂ）の×印で示す方向、即ち紙面表側から裏側を向く応力が発生する。この結果、図１（ａ）の矢印Ｑの方向の応力がアーク放電に対して発生し、この方向に伸張されることになる。   As a result, the magnetic field formed in the open / close space V by the permanent magnet 4 and the yoke 5 is generated in the direction indicated by the arrow E1 in FIG. Is based on Fleming's left-hand rule, and stress is generated in the direction indicated by x in FIG. As a result, a stress in the direction of arrow Q in FIG. 1A is generated with respect to the arc discharge and is expanded in this direction.

一方、補助電極３は、可動接点２を接触／解離動作させるために、開閉動作する可動接触子２ａの先端前方に配置されている。即ち、固定接点１と可動接点２との間（以下、単に「接点間」とする）で発生するアーク放電が永久磁石４の応力で伸張される矢印Ｑの方向に設置されている。
この補助電極３は、可動接点２に対して常に一定の距離を保つように、その移動軌跡にあわせて円弧状に形成されたアーク吸収板３ａを有している。このアーク吸収板３ａは、固定接点１の近傍から立ち上げ形成され、解離した可動接点２の近傍に至る長さを有し、両接点１，２から等距離となるよう配置されている。そして、並列配置したコンデンサＣ及び抵抗Ｒを介して固定接触子１ａに接続されている。 On the other hand, the auxiliary electrode 3 is disposed in front of the distal end of the movable contact 2a that opens and closes to make the movable contact 2 contact / dissociate. That is, the arc discharge generated between the fixed contact 1 and the movable contact 2 (hereinafter simply referred to as “between the contacts”) is installed in the direction of the arrow Q that is extended by the stress of the permanent magnet 4.
The auxiliary electrode 3 has an arc absorbing plate 3a formed in an arc shape in accordance with the movement locus so as to always maintain a constant distance from the movable contact 2. The arc absorbing plate 3a is formed so as to rise from the vicinity of the fixed contact 1, has a length reaching the disengaged movable contact 2, and is arranged at an equal distance from both the contacts 1 and 2. And it is connected to the fixed contact 1a via the capacitor C and the resistor R arranged in parallel.

上記の如く構成された接点部の開操作時に発生するアーク放電は、以下のように消弧される。図２は、図１に示す接点部の開動作説明図であり、（ａ）は解離した直後の状態、（ｂ）は、解離が進み、アーク放電の方向が変化した状態を示し、この図２を参照して説明する。
図２（ａ）に示すように、解離した直後は接点間でアーク放電Ｗが発生する。このアーク放電Ｗは、可動接点２の解離が進むに従い、形成されている磁界による磁力によりアーク吸収板３ａの方へ伸張され、やがて図２（ｂ）に示すように可動接点２と補助電極３との間に移行する。尚、ここでは固定接点１と補助電極３とは抵抗Ｒを介して接続されているため、この間でアーク放電は発生しない。 The arc discharge generated during the opening operation of the contact portion configured as described above is extinguished as follows. 2A and 2B are diagrams for explaining the opening operation of the contact portion shown in FIG. 1, where FIG. 2A shows a state immediately after dissociation, and FIG. 2B shows a state where dissociation has progressed and the direction of arc discharge has changed. This will be described with reference to FIG.
As shown in FIG. 2A, an arc discharge W occurs between the contacts immediately after dissociation. As the dissociation of the movable contact 2 proceeds, the arc discharge W is expanded toward the arc absorbing plate 3a by the magnetic force generated by the formed magnetic field, and eventually the movable contact 2 and the auxiliary electrode 3 as shown in FIG. Transition between. Here, since the fixed contact 1 and the auxiliary electrode 3 are connected via the resistor R, no arc discharge occurs between them.

こうして可動接点２と補助電極３の間にアーク放電Ｗが移行すると、アーク放電Ｗのエネルギーは、コンデンサＣに充電されるが、並列に配置されている抵抗Ｒにより消費され、アーク放電Ｗのエネルギーは直ぐに消滅する。この結果、解離が完了した図１（ａ）の時点で、アーク放電は消弧する。具体的に、例えば電圧４００Ｖ電路においては、一例としてコンデンサＣ＝１μＦ、抵抗Ｒ＝１ｋΩとすることで良好な消弧を実現できる。   When the arc discharge W moves between the movable contact 2 and the auxiliary electrode 3 in this way, the energy of the arc discharge W is charged in the capacitor C, but is consumed by the resistor R arranged in parallel, and the energy of the arc discharge W is Disappears soon. As a result, the arc discharge is extinguished at the time of FIG. Specifically, for example, in a voltage 400V circuit, good arc extinguishing can be realized by setting the capacitor C = 1 μF and the resistance R = 1 kΩ as an example.

このように、電路に電流が流れている状態で接点１，２が解離すると、固定接点１と可動接点２の間でアーク放電が発生するが、このアーク放電は磁力により補助電極３側に伸張される応力により曲がるため、解離動作の途中で接点１，２の間から補助電極３と可動接点２の間に移行する。この移行により、コンデンサＣと抵抗Ｒの並列回路がアーク放電のエネルギーを吸収するため、良好に消弧させることができる。よって、解離した状態の固定接点１と可動接点２との距離を従来より短くすることが可能となり、直流開閉器の小型化に寄与する。   As described above, when the contacts 1 and 2 are dissociated while a current is flowing through the electric circuit, an arc discharge is generated between the fixed contact 1 and the movable contact 2, and this arc discharge is extended to the auxiliary electrode 3 side by a magnetic force. Since it bends due to the stress applied, it shifts between the auxiliary electrode 3 and the movable contact 2 from between the contacts 1 and 2 during the dissociation operation. By this transition, the parallel circuit of the capacitor C and the resistor R absorbs the arc discharge energy, so that the arc can be extinguished well. Therefore, the distance between the disengaged fixed contact 1 and the movable contact 2 can be made shorter than before, which contributes to downsizing of the DC switch.

尚、補助電極３は、コンデンサＣ及び抵抗Ｒを介して固定接触子１に接続されているが、固定接触子１ａではなく可動接触子２ａとの間にコンデンサＣ及びＲを接続しても良い。この場合、アーク放電は接点間から固定接点１と補助電極３の間に移行する。
また、永久磁石４は両接点１，２の左右の一方の側に配置しているが、左右双方に配置しても良く、その場合は継鉄５は無くて良い。 Although the auxiliary electrode 3 is connected to the fixed contact 1 via the capacitor C and the resistor R, the capacitors C and R may be connected to the movable contact 2a instead of the fixed contact 1a. . In this case, arc discharge is transferred between the fixed contact 1 and the auxiliary electrode 3 from between the contacts.
Moreover, although the permanent magnet 4 is arrange | positioned at the one side of both the left and right of both the contacts 1, 2, you may arrange | position at both right and left, In that case, the yoke 5 does not need.

次に、補助電極を可動接触子に連動するように設けた構成を説明する。
［第２の形態］
図３は直流開閉器の第２の形態を示す接点部の概略構成図であり、接点を解離させた状態を示している。また、上記形態と同様に永久磁石４及び継鉄５を備えているが、形状及び配置は同様であるため省略してある。以下、接点及び補助電極に関して説明する。
図３において、６は補助電極であり、固定接点１と可動接点２の間に配置されている。この補助電極６は、先端に可動接触子２ａに接触する補助接点６ａを有し、可動接触子２ａに対峙するように配置されている。また、７は固定配置されて補助電極６が係合するストッパである。
尚、矢印Ｅ２は図示しない永久磁石により形成された磁界の方向を示し、紙面奥側がＮ極で手前がＳ極であることを示している。 Next, the structure which provided the auxiliary electrode so that it might interlock | cooperate with a movable contact is demonstrated.
[Second form]
FIG. 3 is a schematic configuration diagram of a contact portion showing a second form of the DC switch, showing a state in which the contacts are dissociated. Moreover, although the permanent magnet 4 and the yoke 5 are provided similarly to the said form, since the shape and arrangement | positioning are the same, it has abbreviate | omitted. Hereinafter, the contact and the auxiliary electrode will be described.
In FIG. 3, reference numeral 6 denotes an auxiliary electrode, which is disposed between the fixed contact 1 and the movable contact 2. The auxiliary electrode 6 has an auxiliary contact 6a that contacts the movable contact 2a at the tip, and is disposed so as to face the movable contact 2a. Reference numeral 7 denotes a stopper that is fixedly disposed and engages with the auxiliary electrode 6.
The arrow E2 indicates the direction of the magnetic field formed by a permanent magnet (not shown), and indicates that the back side of the paper is the N pole and the near side is the S pole.

補助電極６は、可動接点２に連携して動作するよう配置され、固定接点１と接触状態にある可動接点２が解離動作する際に、可動接触子２ａに接触した状態で同調して開動作する。但し、解離動作の途中でストッパ７に係合することで所定位置で停止し、可動接点２を解離させた状態で固定接点１及び可動接点２の双方と所定の距離を保持する。また、可動接触子２ａとの間にコンデンサＣと抵抗Ｒの並列回路が接続されている。   The auxiliary electrode 6 is arranged so as to operate in conjunction with the movable contact 2, and when the movable contact 2 in contact with the fixed contact 1 is dissociated, the auxiliary electrode 6 is opened in synchronization with the movable contact 2a in contact. To do. However, it engages with the stopper 7 during the disengagement operation, stops at a predetermined position, and maintains a predetermined distance from both the fixed contact 1 and the movable contact 2 with the movable contact 2 disengaged. A parallel circuit of a capacitor C and a resistor R is connected between the movable contact 2a.

上記の如く構成された接点部の開操作時に発生するアーク放電は、以下のように消弧される。図４は接点１，２の解離動作説明図であり、（ａ）は接触させた状態、（ｂ）は解離した直後の状態、（ｃ）は可動接触子２ａが補助電極６から離れた状態を示し、図４を参照して説明する。
図４（ａ）に示すように、可動接点２を固定接点１に接触させた電路閉路中は、補助電極６は可動接触子２ａに接触している。そして、可動接点２の解離が始まると、補助電極６も図４（ｂ）に示すように可動接点２に連動して接触を保持して移動を開始する。同時に、固定接点１と可動接点２との間にアーク放電Ｗが発生する。
その後解離が進むと、やがて補助電極６はストッパ７に係合する。ストッパ７に係合した補助電極６はその時点で停止し、その後図４（ｃ）に示すように可動接触子２ａと分離される。 The arc discharge generated during the opening operation of the contact portion configured as described above is extinguished as follows. 4A and 4B are diagrams for explaining the dissociation operation of the contacts 1 and 2. FIG. 4A is a contact state, FIG. 4B is a state immediately after dissociation, and FIG. 4C is a state in which the movable contact 2a is separated from the auxiliary electrode 6. And will be described with reference to FIG.
As shown in FIG. 4A, the auxiliary electrode 6 is in contact with the movable contact 2a during the electric circuit closing in which the movable contact 2 is brought into contact with the fixed contact 1. When the dissociation of the movable contact 2 starts, the auxiliary electrode 6 also starts to move while maintaining contact with the movable contact 2 as shown in FIG. 4B. At the same time, an arc discharge W is generated between the fixed contact 1 and the movable contact 2.
Thereafter, when the dissociation proceeds, the auxiliary electrode 6 eventually engages with the stopper 7. The auxiliary electrode 6 engaged with the stopper 7 stops at that time, and then separated from the movable contact 2a as shown in FIG.

尚、このストッパ７は、可動接点２の解離が完了した両接点間の略中間位置に補助接点６ａが配置されように設けられている。中間位置とすることで、コンデンサＣと抵抗Ｒの接続先が可動接触子２ａから固定接触子１ａに変更されても、同様なアーク放電の消弧特性を発揮させることができる。   The stopper 7 is provided so that the auxiliary contact 6a is disposed at a substantially intermediate position between the two contacts after the disengagement of the movable contact 2 is completed. By setting the intermediate position, even if the connection destination of the capacitor C and the resistor R is changed from the movable contact 2a to the fixed contact 1a, a similar arc discharge extinguishing characteristic can be exhibited.

分離されることで、固定接点１と可動接点２の間に発生していたアーク放電Ｗは、磁界の作用により補助電極６側に伸び、やがて図４（ｃ）に示すように固定接点１と補助電極６の間に移行する。こうなると、アーク放電のエネルギーはコンデンサＣと抵抗Ｒの並列回路に消費され消弧される。また、可動接触子２と補助電極６とはコンデンサＣと抵抗Ｒとで連結されているため、可動接触子２ａが補助電極６から離れる際にはアーク放電は発生しない。   As a result of the separation, the arc discharge W generated between the fixed contact 1 and the movable contact 2 extends to the auxiliary electrode 6 side by the action of the magnetic field, and eventually, as shown in FIG. Transition between the auxiliary electrodes 6. In this case, arc discharge energy is consumed in the parallel circuit of the capacitor C and the resistor R and is extinguished. Further, since the movable contact 2 and the auxiliary electrode 6 are connected by the capacitor C and the resistor R, arc discharge does not occur when the movable contact 2 a is separated from the auxiliary electrode 6.

このように、電路に電流が流れている状態で接点１，２が解離すると、固定接点１と可動接点２の間でアーク放電が発生するが、このアーク放電は磁力により補助電極６側に伸張される応力により曲がる。一方で、可動接点２に連携して移動する補助電極６は、途中で停止して可動接触子２から離れる。よって、アーク放電は接点解離動作の途中で接点１，２の間から補助電極６と可動接点２の間に移行する。その後は、コンデンサＣと抵抗Ｒの並列回路がアーク放電のエネルギーを吸収するため、補助電極６と可動接触子２とが解離しても両者の間でアーク放電が発生することがなく、良好に消弧させることができる。よって、解離した状態の固定接点１と可動接点２との距離を従来より短くすることが可能となり、直流開閉器の小型化に寄与する。   As described above, when the contacts 1 and 2 are dissociated while a current is flowing through the electric circuit, an arc discharge is generated between the fixed contact 1 and the movable contact 2, and this arc discharge is extended to the auxiliary electrode 6 side by a magnetic force. Bends due to applied stress. On the other hand, the auxiliary electrode 6 that moves in cooperation with the movable contact 2 stops halfway and leaves the movable contact 2. Therefore, the arc discharge is transferred between the auxiliary electrode 6 and the movable contact 2 from between the contacts 1 and 2 during the contact dissociation operation. Thereafter, since the parallel circuit of the capacitor C and the resistor R absorbs the arc discharge energy, the arc discharge does not occur between the auxiliary electrode 6 and the movable contact 2 even when the auxiliary electrode 6 and the movable contact 2 are dissociated. The arc can be extinguished. Therefore, the distance between the disengaged fixed contact 1 and the movable contact 2 can be made shorter than before, which contributes to downsizing of the DC switch.

尚、上記実施形態では、永久磁石４を開閉空間Ｖの側部に両接点に隣接するように配置しているが、両接点の側方に磁石の配置空間が無い場合は、図５に示すように一方の接点の背部（図５では固定接点１の背部）に永久磁石４を配置して、永久磁石の両極から開閉空間Ｖの側方に延びてそれぞれ覆う鉄板９，９を配置しても良い。また、直流開閉器は接点部を一対備えているため、双方の接点部に対して図６に示すように１個の永久磁石４でそれぞれの開閉空間Ｖに磁界を形成しても良い。１０ａ、１０ｂはそれぞれ開閉空間Ｖに磁界を形成するための鉄板を示している。
また、上記実施形態では、補助電極６と可動接触子２ａとをコンデンサＣと抵抗Ｒの並列回路で接続しているが、動接触子２ａではなく固定接触子１ａとの間にコンデンサＣ及び抵抗Ｒを接続しても良い。この場合、アーク放電は接点間から可動接点２と補助電極６の間に移行する。
更に、第１及び第２の形態の何れも、固定接点１をプラス極、可動接点２をマイナス極としているが、逆の極性であっても良く、配置した補助電極にアーク放電が延びるように（引き寄せられるように）磁界を形成すれば良い。 In the above embodiment, the permanent magnet 4 is arranged on the side of the open / close space V so as to be adjacent to both contacts. However, when there is no magnet arrangement space on the side of both contacts, FIG. Thus, the permanent magnet 4 is arranged on the back part of one contact (in FIG. 5, the back part of the fixed contact 1), and iron plates 9 and 9 are arranged so as to extend from both poles of the permanent magnet to the side of the open / close space V, respectively. Also good. Further, since the DC switch is provided with a pair of contact portions, a magnetic field may be formed in each open / close space V by one permanent magnet 4 as shown in FIG. Reference numerals 10a and 10b denote iron plates for forming a magnetic field in the open / close space V, respectively.
Moreover, in the said embodiment, although the auxiliary electrode 6 and the movable contact 2a are connected by the parallel circuit of the capacitor | condenser C and the resistance R, the capacitor | condenser C and resistance are not between the dynamic contact 2a but the fixed contact 1a. R may be connected. In this case, the arc discharge is transferred between the movable contact 2 and the auxiliary electrode 6 from between the contacts.
Further, in both the first and second embodiments, the fixed contact 1 is a positive pole and the movable contact 2 is a negative pole. However, the polarity may be reversed so that arc discharge extends to the arranged auxiliary electrode. A magnetic field may be formed (so that it can be attracted).

１・・固定接点、１ａ・・固定接触子、２・・可動接点、２ａ・・可動接触子、３・・補助電極、４・・永久磁石、６・・補助電極、６ａ・・補助接点、７・・ストッパ、Ｃ・・コンデンサ、Ｒ・・抵抗、Ｖ・・開閉空間。   1 .... fixed contact, 1a ... fixed contact, 2 .... movable contact, 2a ... movable contact, 3 .... auxiliary electrode, 4 .... permanent magnet, 6 .... auxiliary electrode, 6a ... auxiliary contact, 7. Stopper, C ... Capacitor, R ... Resistance, V ... Opening / closing space.

Claims (2)

固定接点を備えた固定接触子と可動接点を備えた可動接触子とを電路上に設けて、前記固定接点に対して可動接点を接触／解離動作させることで、前記電路の接続／遮断を実施する直流開閉器であって、
前記可動接点が接触／解離動作する開閉空間に対して、前記可動接点の移動方向に直交する方向に磁界が形成されるよう配置した永久磁石と、
前記固定接触子、前記可動接触子の何れか一方とコンデンサ及び抵抗の並列回路を介して連結され、解離した前記可動接点近傍から前記固定接点近傍に亘る長さを有する補助電極とを備え、
前記可動接点を解離動作させた際に発生するアーク放電が、前記補助電極の方向へ伸張される磁界を形成するよう前記永久磁石を配置したことを特徴とする直流開閉器。 A fixed contact with a fixed contact and a movable contact with a movable contact are provided on the electric circuit, and the electric contact is connected / disconnected by moving / contacting the movable contact with the fixed contact. A DC switch that
A permanent magnet arranged so that a magnetic field is formed in a direction orthogonal to the moving direction of the movable contact with respect to the open / close space in which the movable contact makes contact / dissociation operation;
An auxiliary electrode connected to either one of the fixed contact and the movable contact through a parallel circuit of a capacitor and a resistor and having a length extending from the vicinity of the disengaged movable contact to the vicinity of the fixed contact;
The DC switch according to claim 1, wherein the permanent magnet is arranged so that arc discharge generated when the movable contact is disengaged forms a magnetic field that extends in the direction of the auxiliary electrode. 固定接点を備えた固定接触子と可動接点を備えた可動接触子とを電路上に設けて、前記固定接点に対して可動接点を接触／解離動作させることで、前記電路の接続／遮断を実施する直流開閉器であって、
前記可動接点が接触／解離動作する開閉空間に対して、前記可動接点の移動方向に略直交する方向に磁界が形成されるよう配置した永久磁石と、
前記固定接触子、前記可動接触子の何れか一方とコンデンサ及び抵抗の並列回路を介して連結され、前記固定接点の近傍で前記可動接触子に接触する補助電極とを備え、
当該補助電極は、前記可動接触子に接触した状態で前記可動接点の接触／解離動作に連動して移動するよう連携配置される一方、前記可動接点の解離動作の途中で前記補助電極の移動を所定位置で停止させるストッパを備え、
前記可動接点を解離動作させた際に発生するアーク放電が、前記補助電極側に伸張される磁界を形成するよう前記永久磁石を配置したことを特徴とする直流開閉器。 A fixed contact with a fixed contact and a movable contact with a movable contact are provided on the electric circuit, and the electric contact is connected / disconnected by moving / contacting the movable contact with the fixed contact. A DC switch that
A permanent magnet disposed so that a magnetic field is formed in a direction substantially perpendicular to the moving direction of the movable contact with respect to the open / close space in which the movable contact is in contact / dissociation operation;
An auxiliary electrode connected to either one of the fixed contact and the movable contact through a parallel circuit of a capacitor and a resistor, and in contact with the movable contact in the vicinity of the fixed contact;
The auxiliary electrode is arranged so as to move in conjunction with the contact / dissociation operation of the movable contact while in contact with the movable contact, while the auxiliary electrode is moved during the dissociation operation of the movable contact. With a stopper that stops at a predetermined position,
The DC switch according to claim 1, wherein the permanent magnet is arranged so that an arc discharge generated when the movable contact is dissociated forms a magnetic field that extends toward the auxiliary electrode.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5625424U (en) * 1980-07-30 1981-03-09
JPS63187542U (en) * 1987-05-19 1988-12-01
JPH09320376A (en) * 1996-05-23 1997-12-12 Kawamura Electric Inc Switch for direct current
JPH10154458A (en) * 1996-11-25 1998-06-09 Matsushita Electric Works Ltd Direct current circuit breaker
JP2002251934A (en) * 2001-02-23 2002-09-06 Mitsubishi Electric Corp Switch
JP2010257808A (en) * 2009-04-27 2010-11-11 Haruko Amiya Knife switch

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5625424U (en) * 1980-07-30 1981-03-09
JPS63187542U (en) * 1987-05-19 1988-12-01
JPH09320376A (en) * 1996-05-23 1997-12-12 Kawamura Electric Inc Switch for direct current
JPH10154458A (en) * 1996-11-25 1998-06-09 Matsushita Electric Works Ltd Direct current circuit breaker
JP2002251934A (en) * 2001-02-23 2002-09-06 Mitsubishi Electric Corp Switch
JP2010257808A (en) * 2009-04-27 2010-11-11 Haruko Amiya Knife switch

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