JP3139812B2 - Hydraulic drive - Google Patents
Hydraulic driveInfo
- Publication number
- JP3139812B2 JP3139812B2 JP04044111A JP4411192A JP3139812B2 JP 3139812 B2 JP3139812 B2 JP 3139812B2 JP 04044111 A JP04044111 A JP 04044111A JP 4411192 A JP4411192 A JP 4411192A JP 3139812 B2 JP3139812 B2 JP 3139812B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- sub
- main
- contact
- switching valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、遮断器の開閉時に発生
するサージ電圧を抑制するための抵抗接点を備えた遮断
器の液圧駆動装置に関するもので、特に、何らかの原因
で抵抗接点の投入状態が一定時間継続した後は、非常遮
断用電磁弁にて抵抗接点を遮断するようにした液圧駆動
装置に係る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic drive device for a circuit breaker having a resistance contact for suppressing a surge voltage generated when the circuit breaker is opened and closed. The present invention relates to a hydraulic drive device in which a resistance contact is shut off by an emergency shutoff solenoid valve after a state has continued for a predetermined time.
【０００２】[0002]
【従来の技術】現在、５５０ｋＶ級の系統の線路用遮断
器には、主接点投入時のサージ電圧を抑制するため、主
接点と並列に抵抗投入接点が設けられている。すなわ
ち、主接点の投入よりも先行して抵抗接点を投入させ、
抵抗に通電させると共に、遮断時にも主接点より先行し
て抵抗接点を遮断させるように構成されている。この機
能を簡素な構造で得るため、主接点と抵抗接点の各可動
接触子を直結することで、同一の駆動装置により同時に
駆動させる一方、両接点の遮断、投入のタイミングは接
触子の構造や形状の相違によって対応している。2. Description of the Related Art At present, a 550 kV line circuit breaker is provided with a resistance making contact in parallel with a main contact in order to suppress a surge voltage when the main contact is made. That is, the resistive contacts are turned on before the main contacts are turned on,
In addition to supplying current to the resistance, the resistance contact is cut off prior to the main contact when the resistance is cut off. To obtain this function with a simple structure, the movable contacts of the main contact and the resistive contact are directly connected, so that they can be driven simultaneously by the same drive device. Corresponding to differences in shape.
【０００３】しかし、１１００ｋＶ級の更に高い電圧系
統では、絶縁レベルを低減するため、遮断時に発生する
サージ電圧の抑制も必要となる。この場合、主接点と並
列に遮断抵抗接点を設けた構成となるが、遮断抵抗接点
を併用した遮断器の動作概念を図４の電気回路にて示
す。However, in a higher voltage system of the 1100 kV class, it is necessary to suppress a surge voltage generated at the time of interruption in order to reduce the insulation level. In this case, an interruption resistance contact is provided in parallel with the main contact. The operation concept of the circuit breaker using the interruption resistance contact together is shown in the electric circuit of FIG.
【０００４】図４（ａ）の遮断器の投入状態において、
電流ｉは通電抵抗値の小さい主接点２を通って流れてい
る。遮断器の右端子側で事故が発生した場合、（ｂ）に
示すように駆動装置１によって主接点２が開離し、電流
ｉを遮断するが、遮断器の左端子側には高い過渡回復電
圧（サージ電圧）が発生する。しかし、抵抗接点Ａ２の
投入状態が維持されるため、これと直列に設けた抵抗Ａ
２ａによってサージ電圧は緩和される。このとき、系統
電圧と抵抗Ａ２ａの値で決まる電流ｉｒが抵抗接点Ａ２
と抵抗Ａ２ａを流れる。続いて、（ｃ）の様に、抵抗接
点Ａ２を開離すると電流ｉｒが遮断され、遮断器は開路
状態となる。サージ電圧を十分抑制するためには、抵抗
接点を主接点よりも２０〜３０ｍｓ遅らせて開離させる
必要がある。一方、遮断器の投入時には、図４（ｃ）の
状態から抵抗接点Ａ２が主接点２に先行して投入され、
抵抗Ａ２ａによりサージ電圧が十分抑制された時点（約
１０ｍｓ後）で主接点２が投入される。In the closed state of the circuit breaker shown in FIG.
The current i flows through the main contact 2 having a small conduction resistance value. When an accident occurs on the right terminal side of the circuit breaker, the main contact 2 is opened by the driving device 1 and the current i is interrupted as shown in (b), but a high transient recovery voltage is applied on the left terminal side of the circuit breaker. (Surge voltage) occurs. However, since the closed state of the resistance contact A2 is maintained, the resistance A
The surge voltage is reduced by 2a. At this time, the current ir determined by the system voltage and the value of the resistor A2a becomes the resistance contact A2.
And the resistor A2a. Subsequently, as shown in (c), when the resistance contact A2 is opened, the current ir is interrupted, and the circuit breaker is opened. In order to sufficiently suppress the surge voltage, it is necessary to open the resistive contact 20 to 30 ms later than the main contact. On the other hand, when the circuit breaker is closed, the resistance contact A2 is closed prior to the main contact 2 from the state of FIG.
When the surge voltage is sufficiently suppressed by the resistor A2a (after approximately 10 ms), the main contact 2 is turned on.
【０００５】上記のように１１００ｋＶ級の抵抗付遮断
器は、主接点の遮断動作から一定時間遅れて抵抗接点が
開離し、主接点の投入動作より先行して抵抗接点が投入
する機能を備えなければならない。しかし、従来の５５
０ｋＶ系統の投入抵抗付遮断器にみられるように、両接
触子の構造の相違だけでこれに対応することは極めて困
難である。As described above, a circuit breaker with a resistance of 1100 kV class must be provided with a function of opening the resistance contact with a delay of a predetermined time from the operation of breaking the main contact and closing the resistance contact prior to the operation of closing the main contact. Must. However, the conventional 55
As seen in a circuit breaker with a closing resistor of the 0 kV system, it is extremely difficult to cope with this only by the difference in the structure of both contacts.
【０００６】従って、主接点と抵抗接点の各可動接触子
を別の駆動装置で操作し、動作のタイミングは機械的な
連動装置などによって確保することが必要である。一般
に、主接点は大出力を容易に得ることのできる液圧で、
抵抗接点はバネの圧縮力で駆動し、両者をリンク機構で
連動する方法が考えられる。しかし、遮断動作の際、抵
抗接点を主接点と同程度の速度で操作する必要があり、
高速動作を得るために大出力を有する駆動バネを用いな
ければならない。Therefore, it is necessary to operate each movable contact of the main contact and the resistance contact by another driving device, and to secure the operation timing by a mechanical interlocking device or the like. Generally, the main contact is a hydraulic pressure that can easily obtain a large output,
A method is considered in which the resistance contact is driven by the compression force of a spring and both are linked by a link mechanism. However, during the breaking operation, it is necessary to operate the resistance contact at the same speed as the main contact,
In order to obtain high-speed operation, a driving spring having a large output must be used.
【０００７】また、主接点と同様、抵抗接点にも消弧機
能が必要であり、広く用いられているパッファ式の消弧
方式を適用した場合、絶縁ガスを圧縮するための駆動力
を更に付加しなければならない。、従って、抵抗接点駆
動バネは大形化し、それに伴うバネ自体の重量増加によ
って応答性の低下を招く可能性がある。もちろん、抵抗
接点の可動接触子など可動部分の軽量化によって駆動力
の低減が図れるが、実用上限界がある。更に、駆動バネ
の蓄勢作用を、主接点を駆動する液圧装置に頼った場
合、蓄勢力が付加として加わるため液圧装置の大形化に
つながる。このように、抵抗接点を圧縮バネで駆動する
構成は、リンクなど主接点との連動機構も設ける必要が
あり、小形化や応答性など実用的見地からは得策でな
い。Further, like the main contact, the resistance contact also needs an arc extinguishing function, and when a widely used puffer type arc extinguishing method is applied, a driving force for compressing the insulating gas is further added. Must. Therefore, the resistance contact driving spring becomes large in size, and the weight of the spring itself may increase, which may cause a decrease in responsiveness. Of course, the driving force can be reduced by reducing the weight of the movable part such as the movable contact of the resistance contact, but there is a practical limit. Furthermore, when the hydraulic spring for driving the main contact is used for the energy storing action of the drive spring, an additional energy is added, leading to an increase in the size of the hydraulic apparatus. As described above, the configuration in which the resistance contact is driven by the compression spring requires the provision of an interlocking mechanism with the main contact such as a link, which is not advisable from a practical point of view such as miniaturization and responsiveness.
【０００８】[0008]
【発明が解決しようとする課題】上記のような問題点を
解決するため、本出願人は、主接点と抵抗接点の各可動
接触子の動作と両者の時間差連動を液圧で行うことによ
り、駆動装置の小形、大出力化を図り、良好な応答性と
信頼性を有する抵抗付遮断器の液圧駆動装置を、別途提
案している。In order to solve the above-mentioned problems, the applicant of the present invention performs the operation of each of the movable contacts of the main contact and the resistance contact and the time difference between the two by hydraulic pressure. We have proposed a hydraulic drive unit for a circuit breaker with resistance that has a small size and a large output, and has good responsiveness and reliability.
【０００９】確かにこのタイプの液圧駆動装置は、前記
のような問題点を解消できるものの、液圧系の異常など
が原因で、抵抗接点が必要時間以上継続して投入された
ままになることが考えられる。この抵抗接点の投入状態
は、サージ性過電圧抑制のためであり、抵抗体部への通
電時間は２０ｍｓ〜６０ｍｓもあれば十分であり、この
時間を越えて抵抗体に電力系統から供給される電流を通
電し続けることは、抵抗体の発熱を招き、最終的には抵
抗体素材の持つ熱耐量を越えたところで抵抗体部の破壊
といった大きな故障の原因となる。Although this type of hydraulic drive can certainly solve the above-mentioned problems, the resistance contact is continuously turned on for a necessary time or more due to an abnormality in the hydraulic system or the like. It is possible. The closed state of the resistance contact is for suppressing the surge overvoltage, and the energization time to the resistor part is sufficient if it is 20 ms to 60 ms, and the current supplied from the power system to the resistor beyond this time is sufficient. Continually energizing the resistor causes heat generation of the resistor, and eventually causes a major failure such as destruction of the resistor portion when the thermal resistance of the resistor material is exceeded.
【００１０】本発明の目的は、前記のような主接点と抵
抗接点の各可動接触子の動作と両者の時間差連動を液圧
で行う液圧駆動装置において、何らかの原因で抵抗接点
の投入状態が一定時間継続した後は、非常遮断用電磁弁
にて抵抗接点を遮断することにより、抵抗体の発熱を防
止して、その破壊を回避することのできる液圧駆動装置
を提供することにある。SUMMARY OF THE INVENTION It is an object of the present invention to provide a hydraulic drive device in which the operation of each movable contact of the main contact and the resistance contact and the time difference interlock between the two contacts are hydraulically operated. It is an object of the present invention to provide a hydraulic drive device in which after a certain period of time, a resistance contact is shut off by an emergency shutoff solenoid valve, thereby preventing heat generation of the resistor and avoiding its destruction.
【００１１】[0011]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明の液圧駆動装置は、遮断器の主接点に連結
された主シリンダと、抵抗接点に連結された副シリンダ
を備え、これら各シリンダの各々の液室内へ、圧力流体
を供給または排除することによって前記主接点と抵抗接
点とを各々駆動する主切換弁と副切換弁を有し、前記副
切換弁と、その弁室内へ圧力流体を給排することによっ
てこれを駆動する前記主切換弁との間に、副切換弁の弁
室内に圧力流体が供給される場合には大流量の作動流体
が流れ、排除される場合には通過流量が制限されるよう
に絞り付き逆止弁から成る連動弁を設けると共に、副切
換弁が所定距離を動くまでは前記副シリンダの液室内の
圧力流体が排除されないように、副切換弁の弁体を形成
した液圧駆動装置において、前記副切換弁に、主接点遮
断後ある規定時間経過しても抵抗接点が遮断動作を開始
ししない場合に、前記副切換弁を抵抗接点の遮断側に切
り換える非常遮断用電磁弁を設けたことを特徴とする。In order to achieve the above object, a hydraulic drive device according to the present invention comprises a main cylinder connected to a main contact of a circuit breaker, and a sub-cylinder connected to a resistance contact. A main switching valve and a sub switching valve that respectively drive the main contact and the resistance contact by supplying or removing a pressurized fluid to each liquid chamber of each of the cylinders, and the sub switching valve and the valve When a pressurized fluid is supplied into the valve chamber of the sub-switching valve between the main switching valve which drives the pressure fluid by supplying and discharging the chamber to the chamber, a large flow of the working fluid flows and is eliminated. In such a case, an interlocking valve consisting of a check valve with a throttle is provided so as to restrict the passing flow rate, and a sub fluid is not removed from the liquid chamber of the sub cylinder until the sub switching valve moves a predetermined distance. Hydraulic drive device forming valve body of switching valve An emergency shutoff solenoid valve for switching the sub-switching valve to the interrupting side of the resistive contact when the resistive contact does not start the interrupting operation even after a lapse of a predetermined time after the main contact is interrupted. It is characterized by having been provided.
【００１２】[0012]
【作用】上記のような構成を有する本発明の液圧駆動装
置においては、主切換弁が主シリンダ内の圧力流体を排
除した後、副切換弁が所定距離を移動した時点で副シリ
ンダ内の圧力流体が排除されるため、抵抗接点の開離は
主接点よりも所定の時間差だけ遅延する。一方、主切換
弁が主シリンダ内に液圧を供給すると同時に、副切換弁
から副シリンダ内に液圧が供給されるので、抵抗接点は
主接点よりも所定時間先行して投入される。In the hydraulic drive apparatus of the present invention having the above-described structure, after the main switching valve removes the pressurized fluid in the main cylinder, when the sub switching valve moves a predetermined distance, the hydraulic pressure in the sub cylinder is reduced. Due to the exclusion of the pressure fluid, the opening of the resistive contact is delayed by a predetermined time difference from the main contact. On the other hand, at the same time that the main switching valve supplies the hydraulic pressure into the main cylinder, the hydraulic pressure is supplied from the sub-switching valve into the sub-cylinder, so that the resistance contact is closed before the main contact by a predetermined time.
【００１３】また、仮に何らかの原因で主接点の遮断
後、ある規定時間経過しても抵抗接点が遮断動作を開始
しない場合には、それを検出した非常遮断用電磁弁が動
作して、前記副切換弁を抵抗接点の遮断側に切り換え、
抵抗接点を強制的に遮断する。If the resistive contact does not start the shut-off operation for a certain period of time after the main contact is shut off for some reason, the emergency shut-off solenoid valve which has detected this operation operates and the sub-contact is activated. Switch the switching valve to the cutoff side of the resistance contact,
Forcibly cut off the resistance contact.
【００１４】[0014]
【実施例】以下、本発明の一実施例を図１乃至図３によ
り説明する。 （１）実施例の構成 図１は本実施例の抵抗付遮断器の液圧駆動装置１の構成
を示すもので、主接点２と抵抗接点Ａ２が投入状態のも
のである。主接点２及び抵抗接点Ａ２を各々開閉する主
操作部３と副操作部Ａ３は、主制御弁部５と副制御弁部
Ａ５で制御される圧力流体により駆動される。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. (1) Configuration of Embodiment FIG. 1 shows a configuration of a hydraulic drive device 1 for a circuit breaker with a resistor according to the present embodiment, in which a main contact 2 and a resistance contact A2 are in a closed state. The main operation unit 3 and the sub operation unit A3 that open and close the main contact 2 and the resistance contact A2, respectively, are driven by a pressure fluid controlled by the main control valve unit 5 and the sub control valve unit A5.
【００１５】主操作部３は主シリンダ３０、主ピストン
３１、主ピストンロッド３２から成り、主ピストン３１
の動作で主接点２が開閉するよう、主ピストンロッド３
２で両者が連結されている。主シリンダ３０の液室３３
は常時圧力流体を蓄えたアキュムレータ６に配管４を介
して連通し、主ピストン３１の背部の液室３４には主制
御弁部５を介して高圧流体の給排が行われる。The main operating section 3 comprises a main cylinder 30, a main piston 31, and a main piston rod 32.
The main piston rod 3 so that the main contact 2 opens and closes
2 connects both. Liquid chamber 33 of main cylinder 30
Is connected via a pipe 4 to an accumulator 6 which always stores a pressurized fluid, and a high pressure fluid is supplied and discharged to and from a liquid chamber 34 behind the main piston 31 via a main control valve portion 5.
【００１６】主制御弁部５はマニホールド５０とその内
部で動作する主切換弁５１で構成され、主シリンダ３０
内の液室３４と連通するシリンダポート５２、液室３３
と流路３５で連通した高圧ポート５３、及び低圧タンク
９と連通する排液ポート５４が形成されている。そし
て、シリンダポート５２と高圧ポート５３との間、ある
いはシリンダポート５２と排液ポート５４との間は、主
切換弁５１の移動によって開閉切り換えが可能になって
いる。また、マニホールド５０と主切換弁５１によって
形成される弁室５５と弁室５６は、高圧ポート５３と各
々絞り５７及び５８を介して連通されており、常時高圧
液が供給される。The main control valve section 5 comprises a manifold 50 and a main switching valve 51 which operates inside the manifold 50.
Cylinder port 52 communicating with liquid chamber 34 inside liquid chamber 33
A high pressure port 53 communicating with the low pressure tank 9 and a high pressure port 53 communicating with the low pressure tank 9 are formed. Opening and closing can be switched between the cylinder port 52 and the high pressure port 53 or between the cylinder port 52 and the drain port 54 by moving the main switching valve 51. Further, a valve chamber 55 and a valve chamber 56 formed by the manifold 50 and the main switching valve 51 are communicated with the high-pressure port 53 via throttles 57 and 58, respectively, and are always supplied with a high-pressure liquid.
【００１７】主切換弁５１は、弁室５５及び５６と各々
流路５５ａ及び５６ａで連通された遮断用及び投入用電
磁弁７，８で操作される。各電磁弁７，８は、電磁ソレ
ノイド７１，８１の付勢により、それぞれのパイロット
弁体７２，８２を開く構成になっている。パイロット弁
体７２，８２の開口動作によって、弁室５５または５６
の高圧液は排液流路７３，８３を介して、前記低圧タン
ク９に回収される。The main switching valve 51 is operated by shut-off and closing solenoid valves 7, 8 which are communicated with valve chambers 55, 56 through flow paths 55a, 56a, respectively. Each of the electromagnetic valves 7 and 8 is configured to open its respective pilot valve body 72 and 82 by the bias of the electromagnetic solenoids 71 and 81. The opening operation of the pilot valve bodies 72 and 82 causes the valve chamber 55 or 56 to open.
The high-pressure liquid is collected in the low-pressure tank 9 through the drainage channels 73 and 83.
【００１８】一方、副操作部Ａ３は副シリンダＡ３０、
副ピストンＡ３１、副ピストンロッドＡ３２から成り、
副ピストンＡ３１の動作で抵抗接点Ａ２が開閉するよ
う、副ピストンロッドＡ３２で両者が連結されている。
副シリンダＡ３０の液室Ａ３３は常時圧力流体を蓄えた
アキュムレータ６に配管Ａ４を介して連通し、副ピスト
ンＡ３１の背部の液室Ａ３４は副制御弁部Ａ５を介して
高圧流体の給排が行われる。On the other hand, the sub-operation unit A3 includes a sub-cylinder A30,
Consisting of a sub piston A31 and a sub piston rod A32,
Both are connected by a sub-piston rod A32 so that the resistance contact A2 is opened and closed by the operation of the sub-piston A31.
The liquid chamber A33 of the sub-cylinder A30 communicates with the accumulator 6 which always stores the pressurized fluid through a pipe A4, and the liquid chamber A34 behind the sub-piston A31 supplies and discharges the high-pressure fluid through the sub-control valve A5. Will be
【００１９】副制御弁部Ａ５はマニホールドＡ５０とそ
の内部で動作する副切換弁Ａ５１で構成され、さらに副
切換弁Ａ５１は副遮断弁Ａ５１ａと副投入弁Ａ５１ａに
より形成される。マニホールドＡ５０には、副シリンダ
Ａ３０内の液室Ａ３４と連通するシリンダポートＡ５
２、液室Ａ３３と流路Ａ３５で連通した高圧ポートＡ５
３、及び低圧タンク９と連通する排液ポートＡ５４が形
成されている。そして、シリンダポートＡ５２と高圧ポ
ートＡ５３との間、あるいはシリンダポートＡ５２と排
液ポートＡ５４との間は、副切換弁Ａ５１の移動によっ
て開閉切り換えが可能になっている。The sub-control valve section A5 is composed of a manifold A50 and a sub-switching valve A51 operating inside the manifold A50. The sub-switching valve A51 is formed by a sub-cutoff valve A51a and a sub-injection valve A51a. The manifold A50 has a cylinder port A5 communicating with the liquid chamber A34 in the sub cylinder A30.
2. High pressure port A5 communicating with the liquid chamber A33 through the flow path A35
3, and a drain port A54 communicating with the low-pressure tank 9 is formed. And, between the cylinder port A52 and the high-pressure port A53 or between the cylinder port A52 and the drainage port A54, opening and closing can be switched by moving the sub switching valve A51.
【００２０】この副切換弁Ａ５１を構成する副遮断弁Ａ
５１ａは、摺動体Ａ５１ｃが付加された弁体を有してお
り、これが摺動体Ａ５１ｃの長さに相当する距離を移動
するまでは、シリンダポートＡ５２と排液ポートＡ５４
間の連通が阻止される。また、マニホールドＡ５０と副
遮断弁Ａ５１ａによって形成される弁室Ａ５５は、主切
換弁５１のシリンダポート５２と流路５９により、連動
弁部Ａ７を介して連通している。さらに、マニホールド
Ａ５０と副投入弁Ａ５１ｂによって形成される弁室Ａ５
６は、高圧ポートＡ５３と連通されており、常時高圧液
が供給される。The sub shutoff valve A constituting the sub switching valve A51
51a has a valve body to which a sliding body A51c is added. Until this travels a distance corresponding to the length of the sliding body A51c, a cylinder port A52 and a drain port A54 are provided.
Communication between them is blocked. Further, a valve chamber A55 formed by the manifold A50 and the sub shut-off valve A51a communicates with the cylinder port 52 of the main switching valve 51 and the flow path 59 via the interlocking valve portion A7. Further, a valve chamber A5 formed by the manifold A50 and the auxiliary input valve A51b.
Reference numeral 6 communicates with the high-pressure port A53, and the high-pressure liquid is always supplied.
【００２１】連動弁部Ａ７は、逆止弁Ａ７１と絞りＡ７
２から構成され、主制御弁部５で制御される液圧に応じ
て副制御弁部Ａ５が連動するように機能する。すなわ
ち、主制御弁部５から副制御弁部Ａ５の弁室Ａ５５に圧
力流体が供給される場合には、逆止弁Ａ７１は開口し大
流量の作動液が流れ、逆に弁室Ａ５５から圧力流体が排
除される場合には逆止弁Ａ７１は閉止し、絞りＡ７２に
よって流量が制限される。The interlocking valve portion A7 includes a check valve A71 and a throttle A7.
The auxiliary control valve unit A5 functions in accordance with the hydraulic pressure controlled by the main control valve unit 5. That is, when the pressurized fluid is supplied from the main control valve unit 5 to the valve chamber A55 of the sub control valve unit A5, the check valve A71 is opened to allow a large flow of hydraulic fluid to flow, and conversely, the pressure from the valve chamber A55 When the fluid is removed, the check valve A71 closes and the flow is restricted by the throttle A72.
【００２２】上記のような構成を有する本実施例の液圧
駆動装置には、さらに、非常遮断用電磁弁２２０が設け
られている。この非常遮断用電磁弁２２０は、その開閉
制御装置２１０を介して、主接点２と抵抗接点Ａ２両者
の遮断投入状態を検出する開閉センサ２００，Ａ２００
に接続されている。すなわち、開閉制御装置２１０は、
一種の電気的遅延リレーで、前記開閉センサ２００，Ａ
２００により主接点２が遮断状態、抵抗接点Ａ２が投入
状態となる条件を検出すると、本来両接点間の遅延時間
を制御している逆止弁Ａ７１にある絞りＡ７２によって
得られる遅延時間を経過した時間領域で、前記非常遮断
用電磁弁２２０に遮断指令を入れるものである。The hydraulic drive device according to the present embodiment having the above-described configuration is further provided with an emergency shutoff solenoid valve 220. The emergency shutoff solenoid valve 220 is provided with the open / close control device 210 to detect the open / closed state of both the main contact 2 and the resistance contact A2.
It is connected to the. That is, the opening and closing control device 210
A kind of electrical delay relay, said open / close sensor 200, A
When the condition that the main contact 2 is turned off and the resistance contact A2 is turned on is detected by 200, the delay time obtained by the throttle A72 in the check valve A71 that originally controls the delay time between the two contacts has passed. In the time domain, a shutoff command is input to the emergency shutoff solenoid valve 220.
【００２３】この非常遮断用電磁弁２２０は、電磁ソレ
ノイド２２３によって駆動されるパイロット弁２２１を
備え、副切換弁Ａ５１のマニホールドＡ５０のシリンダ
ポートＡ５２と低圧タンク９とを結ぶ排液流路２２２上
に設けられている。従って、この非常遮断用電磁弁２２
０が投入された場合には、前記パイロット弁２２１が開
いて、マニホールドＡ５０のシリンダポートＡ５２が低
圧になるように構成されている。The emergency shutoff solenoid valve 220 includes a pilot valve 221 driven by an electromagnetic solenoid 223, and is provided on a drain passage 222 connecting the cylinder port A52 of the manifold A50 of the sub switching valve A51 and the low pressure tank 9. Is provided. Therefore, the emergency shutoff solenoid valve 22
When 0 is input, the pilot valve 221 is opened, and the cylinder port A52 of the manifold A50 is configured to have a low pressure.
【００２４】（２）実施例の作用 次に、上記の如く構成された本実施例の作用について、
動作状態を示した図２と図３を併用して説明する。(2) Operation of Embodiment Next, the operation of this embodiment configured as described above will be described.
The operation will be described with reference to FIGS.
【００２５】図１に示した主接点２と抵抗接点Ａ２の投
入状態では、主制御弁部５と副制御弁部Ａ５の各々のシ
リンダポート５２，Ａ５２と高圧ポート５３，Ａ５３間
は開口し、排液ポート５４，Ａ５４は閉止されているた
め、液室３４，Ａ３４の高圧液によって主ピストン３１
と副ピストンＡ３１は上方位置にて保持されている。In the closed state of the main contact 2 and the resistance contact A2 shown in FIG. 1, the cylinder ports 52, A52 and the high-pressure ports 53, A53 of the main control valve section 5 and the sub-control valve section A5 are open. Since the drain ports 54 and A54 are closed, the high pressure liquid in the liquid chambers 34 and A34 causes the main piston 31 to be closed.
And the auxiliary piston A31 are held at the upper position.
【００２６】この時、遮断動作指令が遮断用電磁弁７に
与えられると、主制御弁部５の弁室５５から高圧液が流
出し圧力が低下するため、弁室５６などの圧力流体の作
用により切換弁５１は右方に移動する。シリンダポート
５２と排液ポート５４間が開くことによって、主シリン
ダ３０内の液室３４から高圧液が排出され、その圧力低
下によって主ピストン３１は下方に動作する。これに伴
って、主接点２は遮断動作を行うが、この時シリンダポ
ート５２と連通する弁室Ａ５５の液圧が低下し、弁室Ａ
５６などの圧力流体の作用により副切換弁Ａ５１は一体
になって左方へ始動する。連通弁部Ａ７の逆止弁Ａ７１
は閉止し、絞りＡ７２によって弁室Ａ５５からの高圧液
の流出が抑制されるため、副切換弁Ａ５１は緩やかに動
作する。動作中、副遮断弁Ａ５１ａの摺動体Ａ５１ｃに
より、シリンダポートＡ５２と排液ポートＡ５４の連通
が阻止されるため、副シリンダＡ３０の液室Ａ３４内は
高圧状態が維持され、副ピストンＡ３２によって抵抗接
点Ａ２の投入状態が保持される。At this time, when a shut-off operation command is given to the shut-off solenoid valve 7, the high-pressure liquid flows out of the valve chamber 55 of the main control valve section 5 and the pressure drops. As a result, the switching valve 51 moves rightward. When the space between the cylinder port 52 and the drain port 54 is opened, the high-pressure liquid is discharged from the liquid chamber 34 in the main cylinder 30, and the main piston 31 moves downward due to the pressure drop. Accordingly, the main contact 2 performs a shutoff operation. At this time, the hydraulic pressure of the valve chamber A55 communicating with the cylinder port 52 decreases, and the valve chamber A
By the action of the pressure fluid such as 56, the sub-switching valve A51 is integrally started to the left. Check valve A71 of communication valve section A7
Is closed, and the throttle A72 suppresses the outflow of the high-pressure liquid from the valve chamber A55, so that the sub switching valve A51 operates slowly. During operation, since the communication between the cylinder port A52 and the drain port A54 is prevented by the sliding member A51c of the sub shut-off valve A51a, the high pressure state is maintained in the liquid chamber A34 of the sub cylinder A30, and the resistance contact is made by the sub piston A32. The input state of A2 is maintained.
【００２７】図２に示されるように、遮断動作指令の解
除後、パイロット弁体７２の閉止によって弁室５５の圧
力が回復しても、シリンダポート５２の液圧低下によっ
て主切換弁５１は高圧ポート５３の閉止状態を維持し、
主接点２の遮断状態が保たれる。一方、副遮断弁Ａ５１
ａの摺動体Ａ５１ｃとマニホールドＡ５０との重合部に
おける間隙を介して、シリンダポートＡ５２から小量の
高圧液が排液ポートＡ５４に流出するが、この間高圧ポ
ートＡ５３から高圧液が液室Ａ３４に供給されるため、
副ピストンＡ３２は確実に投入位置で保持される。As shown in FIG. 2, even if the pressure in the valve chamber 55 recovers due to the closing of the pilot valve body 72 after the release of the shut-off operation command, the main switching valve 51 has a high pressure due to a decrease in the hydraulic pressure of the cylinder port 52. Maintain the closed state of port 53,
The cutoff state of the main contact 2 is maintained. On the other hand, the sub shutoff valve A51
A small amount of high-pressure liquid flows out from the cylinder port A52 to the drain port A54 through a gap in the overlapping portion between the sliding body A51c and the manifold A50, while the high-pressure liquid is supplied from the high-pressure port A53 to the liquid chamber A34. To be
The auxiliary piston A32 is reliably held at the closing position.
【００２８】副切換弁Ａ５１がさらに左方に移動し、摺
動体Ａ５１ｃとマニホールドＡ５０との重合が解除され
ると、シリンダポートＡ５２と排液ポートＡ５４の間が
開口し、液室Ａ３４内の液圧は急速に下降する。このと
き、副投入弁Ａ５１によって高圧ポートＡ５３とシリン
ダポートＡ５２の間は閉止され、図３に示すように、副
ピストンＡ３１は下方へ動くため抵抗接点Ａ２が開離す
る。主接点２の開離動作から抵抗接点Ａ２が開離するま
での遅延時間は、連動弁部Ａ７の絞りＡ７２の流路断面
積や、副遮断弁Ａ５１の摺動体Ａ５１ｃの長さに相当す
る重合距離を調節し、副シリンダＡ３０内の圧力流体を
排除するタイミングを適度に遅らせることによって確保
できる。When the sub-switching valve A51 further moves to the left and the overlap between the sliding body A51c and the manifold A50 is released, the space between the cylinder port A52 and the drain port A54 is opened, and the liquid in the liquid chamber A34 is opened. The pressure drops rapidly. At this time, the space between the high pressure port A53 and the cylinder port A52 is closed by the auxiliary injection valve A51, and as shown in FIG. 3, the auxiliary piston A31 moves downward, so that the resistance contact A2 is opened. The delay time from the opening operation of the main contact 2 to the opening of the resistance contact A2 is a polymerization time corresponding to the cross-sectional area of the flow passage of the throttle A72 of the interlocking valve portion A7 and the length of the sliding member A51c of the sub shutoff valve A51. This can be ensured by adjusting the distance and appropriately delaying the timing of removing the pressurized fluid in the sub cylinder A30.
【００２９】図３に示した主接点２と抵抗接点Ａ２の遮
断状態において、投入指令が投入用電磁弁８に与えられ
ると弁室５６内の液圧が低下し、弁室５５内の圧力流体
により主切換弁５１は左方に切り換わる。このため、液
室３４に高圧液が供給され、主ピストン３１は主接点２
と共に投入方向へ駆動される。同時に、連動弁部Ａ７の
逆止弁Ａ７１が開いて大量の高圧液が弁室Ａ５５に供給
されるので、その圧力流体の作用により副切換弁Ａ５１
は一体となって急速に右方に切り換わる。このため、液
室Ａ３４の液圧が上昇し、主ピストン３１とほぼ同時に
副ピストンＡ３１と抵抗接点Ａ２は投入方向へ始動す
る。この場合、抵抗接点Ａ２は主接点２よりも所定時間
先行して投入されるが、その時間差は、主・副シリンダ
３０，Ａ３０の各配管３５，Ａ３５の流路断面積の調整
などによって、両者に投入速度差を与えれば確保でき
る。あるいは、従来技術にて説明したように、主接点２
と抵抗接点Ａ２で構造や形状を変えることで対応するこ
とも十分可能である。In the state where the main contact 2 and the resistance contact A2 shown in FIG. 3 are cut off, when a closing command is given to the closing solenoid valve 8, the fluid pressure in the valve chamber 56 decreases, and the pressure fluid in the valve chamber 55 decreases. As a result, the main switching valve 51 switches to the left. Therefore, the high-pressure liquid is supplied to the liquid chamber 34 and the main piston 31 is connected to the main contact 2.
And is driven in the closing direction. At the same time, the check valve A71 of the interlocking valve portion A7 opens and a large amount of high-pressure liquid is supplied to the valve chamber A55.
Quickly switches to the right as one. Therefore, the hydraulic pressure in the liquid chamber A34 increases, and the sub piston A31 and the resistance contact A2 start in the closing direction almost simultaneously with the main piston 31. In this case, the resistance contact A2 is closed before the main contact 2 by a predetermined time, but the time difference is changed by adjusting the flow path cross-sectional area of each of the pipes 35 and A35 of the main / sub cylinders 30 and A30. Can be secured by giving a difference in charging speed. Alternatively, as described in the prior art, the main contact 2
It is also possible to cope with this by changing the structure and shape of the resistance contact A2.
【００３０】このように、本実施例によれば、主接点と
抵抗接点とを、ほぼ同一の構造を有する液圧駆動回路に
より操作すると共に、２つの回路を簡素な構造の連動弁
を介して連結したので、所定の時間差で、確実かつ良好
な応答性を持って連動させることが可能となる。As described above, according to this embodiment, the main contact and the resistance contact are operated by the hydraulic drive circuit having substantially the same structure, and the two circuits are connected through the interlocking valve having a simple structure. Since the connection is made, it is possible to link with a certain time difference with certainty and good responsiveness.
【００３１】ところで、上記のような本実施例の液圧駆
動装置において、例えば、遅延時間を制御する逆止弁Ａ
７１にある絞りＡ７２の中に何らかの異物がかみ込ん
で、副切換弁Ａ５１の弁室Ａ５５側の液圧が低下しなく
なり、副ピストンＡ３１の下方にあたる液室Ａ３４の液
圧が低下せず、副ピストンロッドＡ３２が上方に保持さ
れたままになったとする。この状態では、主接点２が遮
断したにも拘らず、抵抗接点Ａ２が投入状態のままとな
り、抵抗Ａ２ａに継続的に通電がなされてしまう。By the way, in the hydraulic drive apparatus of the present embodiment as described above, for example, the check valve A for controlling the delay time
When any foreign matter gets into the throttle A72 at 71, the hydraulic pressure on the valve chamber A55 side of the sub switching valve A51 does not decrease, and the hydraulic pressure of the liquid chamber A34 below the auxiliary piston A31 does not decrease. It is assumed that the piston rod A32 remains held upward. In this state, although the main contact 2 is cut off, the resistance contact A2 remains in the closed state, and the resistance A2a is continuously energized.
【００３２】しかし、本実施例では、この主接点２と抵
抗接点Ａ２との遮断・投入状態を開閉センサ２００，Ａ
２００で監視し、抵抗接点Ａ２のみの投入状態が逆止弁
Ａ７１によって設定された遅延時間を越えると、制御装
置２１０から非常遮断用電磁弁２２０に対して、動作指
令が発せられる。そして、この非常遮断用電磁弁２２０
が投入されると、そのパイロット弁２２１が開き、シリ
ンダポートＡ５２が排液流路２２２を介して低圧タンク
９と連通するので、弁室Ａ３４，Ａ５２の液圧が低下す
る。その結果、副ピストンＡ３１が下方に移動し、これ
につながる副ピストンロッドＡ３２及び抵抗接点Ａ２は
遮断動作へと移行する。（図３参照） （３）他の実施例 前記実施例では、主・副ピストン３１，Ａ３１を主・副
切換弁５１，Ａ５１で直接駆動する構成としているが、
液室３４，Ａ３４とシリンダポート５２，Ａ５２の間に
開口流路面積の大きい弁を設け、さらに大流量の高圧液
を液室３４，Ａ３４に給排する構成としても同様の作
用、効果を発揮できる。また、連動弁部Ａ７の絞りＡ７
２を、外部からの流量調整が可能な可変絞りとした場
合、遮断時における副切換弁Ａ５１の切り換え速度を制
御できるので、両接点の開離動作の遅延時間を微妙に調
整することができる。However, in this embodiment, the on / off state of the main contact 2 and the resistance contact A2 is determined by the open / close sensors 200, A
Monitoring at 200, if the closed state of only the resistance contact A2 exceeds the delay time set by the check valve A71, the control device 210 issues an operation command to the emergency shutoff solenoid valve 220. The emergency shutoff solenoid valve 220
Is input, the pilot valve 221 is opened, and the cylinder port A52 communicates with the low-pressure tank 9 via the drain passage 222, so that the hydraulic pressure in the valve chambers A34 and A52 decreases. As a result, the sub-piston A31 moves downward, and the sub-piston rod A32 and the resistance contact A2 connected to this move to the breaking operation. (See FIG. 3) (3) Other Embodiments In the above embodiment, the main / sub pistons 31, A31 are directly driven by the main / sub switching valves 51, A51.
The same operation and effect can be obtained by providing a valve having a large opening flow area between the liquid chambers 34 and A34 and the cylinder ports 52 and A52, and supplying and discharging a high flow rate of high-pressure liquid to and from the liquid chambers 34 and A34. it can. Also, the throttle A7 of the interlocking valve portion A7
When 2 is a variable throttle capable of adjusting the flow rate from the outside, the switching speed of the sub switching valve A51 at the time of shutoff can be controlled, so that the delay time of the opening operation of the two contacts can be finely adjusted.
【００３３】更に、非常遮断用電磁弁２２０を制御する
手段としては、前記のような開閉センサ２００，Ａ２０
０と制御装置２１０との組み合わせ以外に、遮断用や投
入用の電磁弁７，８への投入指令から一定時間経過後に
抵抗接点Ａ２の投入状態を検出して、非常用電磁弁２２
０に遮断指令を与えるものも使用できる。As means for controlling the emergency shutoff solenoid valve 220, the above-mentioned open / close sensors 200 and A20
In addition to the combination of the emergency solenoid valve 22 and the control device 210, the emergency solenoid valve 22 detects the closing state of the resistance contact A2 after a lapse of a predetermined time from a closing command to the shut-off or closing solenoid valves 7, 8.
One that gives a shut-off command to 0 can be used.
【００３４】[0034]
【発明の効果】以上説明したように、本発明によれば、
主接点と抵抗接点の遮断・投入動作と、両接点に要求さ
れる所定時間差での連動を、液圧駆動装置によって実現
したので、駆動装置の小形、大出力化が図れ、良好な応
答性と信頼性を有する抵抗付き遮断器を提供することが
できる。As described above, according to the present invention,
Hydraulic drive unit realizes interlocking and closing operations of the main and resistance contacts and the required time difference between both contacts by means of a hydraulic drive unit, so that the drive unit can be reduced in size and output, resulting in good responsiveness. A reliable circuit breaker with a resistor can be provided.
【００３５】特に、本発明では、非常遮断用電磁弁の作
用により、主接点遮断後一定時間経過した後は、強制的
に抵抗接点を遮断できるので、万一の主接点駆動部と抵
抗接点駆動部間の液圧連係部の不調により、抵抗接点部
のみが投入されたままになることが防止され、投入抵抗
の過度な発熱による抵抗体部の破壊という影響度の大き
な不具合が回避可能となり、信頼性と実用性の高い抵抗
付き遮断器を得ることが可能となる。In particular, in the present invention, the resistance contact can be forcibly cut off after a certain period of time after the main contact is cut off by the action of the emergency cutoff solenoid valve. Due to the malfunction of the fluid pressure link between the parts, it is possible to prevent only the resistance contact part from being kept turned on, and it is possible to avoid a serious problem of destruction of the resistor part due to excessive heating of the closing resistance, A highly reliable and practical circuit breaker with a resistor can be obtained.
【図１】本発明の液圧駆動装置の一実施例を示す配管構
成図であって、主接点と抵抗接点の投入状態を示す。FIG. 1 is a piping configuration diagram showing one embodiment of a hydraulic drive device of the present invention, showing a closed state of a main contact and a resistance contact.
【図２】図１の実施例の主接点の遮断状態と抵抗接点の
投入状態を示す配管構成図。FIG. 2 is a piping configuration diagram showing a closed state of a main contact and a closed state of a resistance contact in the embodiment of FIG. 1;
【図３】図１の実施例の主接点と抵抗接点の遮断状態を
示す配管構成図。FIG. 3 is a piping configuration diagram showing a cut-off state of a main contact and a resistance contact in the embodiment of FIG. 1;
【図４】遮断抵抗接点と投入抵抗接点を併用した遮断器
の動作を説明する回路図。FIG. 4 is a circuit diagram illustrating the operation of a circuit breaker using both a breaking resistance contact and a closing resistance contact.
１：液圧駆動装置 ２：主接点 ３：主操作部 ４：配管 ５：主制御弁部 ６：アキュムレータ ７，８：遮断用、投入用電磁弁 ９：低圧タンク Ａ２：抵抗接点 Ａ３：副操作部 Ａ４：配管 Ａ５：副制御弁部 Ａ７：連動弁部 ２００，Ａ２００；開閉センサ ２１０；制御装置 ２２０；非常遮断用電磁弁 ２２１；パイロット弁体 ２２２；排液流路 ２２３；電磁ソレノイド 1: hydraulic drive 2: main contact 3: main operating part 4: pipe 5: main control valve part 6: accumulator 7, 8: solenoid valve for shut-off, closing 9: low pressure tank A2: resistance contact A3: sub-operation Part A4: Piping A5: Sub-control valve part A7: Interlocking valve part 200, A200; Open / close sensor 210; Control device 220; Emergency shut-off solenoid valve 221; Pilot valve body 222; Drainage flow path 223;
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H01H 33/34 H01H 33/16 H01H 33/70 H01H 33/42 Continuation of the front page (58) Field surveyed (Int.Cl. 7 , DB name) H01H 33/34 H01H 33/16 H01H 33/70 H01H 33/42
Claims (1)
と、抵抗接点に連結された副シリンダを備え、これら各
シリンダの各々の液室内へ、圧力流体を供給または排除
することによって前記主接点と抵抗接点とを各々駆動す
る主切換弁と副切換弁を有し、 前記副切換弁と、その弁室内へ圧力流体を給排すること
によってこれを駆動する前記主切換弁との間に、副切換
弁の弁室内に圧力流体が供給される場合には大流量の作
動流体が流れ、排除される場合には通過流量が制限され
るように絞り付き逆止弁から成る連動弁を設けると共
に、 副切換弁が所定距離を動くまでは前記副シリンダの液室
内の圧力流体が排除されないように、副切換弁の弁体を
形成した液圧駆動装置において、 前記副切換弁に、主接点遮断後ある規定時間経過しても
抵抗接点が遮断動作を開始ししない場合に、前記副切換
弁を抵抗接点の遮断側に切り換える非常遮断用電磁弁を
設けたことを特徴とする。1. A main cylinder connected to a main contact of a circuit breaker, and a sub-cylinder connected to a resistance contact. The main fluid is supplied to or discharged from a liquid chamber of each cylinder by the main cylinder. A main switching valve and a sub switching valve for driving a contact and a resistance contact, respectively, between the sub switching valve and the main switching valve for driving by supplying and discharging a pressurized fluid into and from the valve chamber; When the pressurized fluid is supplied into the valve chamber of the sub-switching valve, an interlocking valve including a check valve with a throttle is provided so that a large flow rate of the working fluid flows, and when the fluid is excluded, the flow rate is restricted. A hydraulic drive device formed with a valve body of the sub-switching valve so that the pressure fluid in the liquid chamber of the sub-cylinder is not removed until the sub-switching valve moves a predetermined distance. Resistive connection even after a certain specified time has elapsed after shutoff There when not to start the cutoff operation, characterized in that a emergency shut-off solenoid valve for switching the auxiliary switching valve to shut off the side of the resistance contact.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04044111A JP3139812B2 (en) | 1992-02-28 | 1992-02-28 | Hydraulic drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04044111A JP3139812B2 (en) | 1992-02-28 | 1992-02-28 | Hydraulic drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05242767A JPH05242767A (en) | 1993-09-21 |
| JP3139812B2 true JP3139812B2 (en) | 2001-03-05 |
Family
ID=12682505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04044111A Expired - Fee Related JP3139812B2 (en) | 1992-02-28 | 1992-02-28 | Hydraulic drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3139812B2 (en) |
-
1992
- 1992-02-28 JP JP04044111A patent/JP3139812B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05242767A (en) | 1993-09-21 |
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| LAPS | Cancellation because of no payment of annual fees |