JP6369637B2 - Circuit breaker - Google Patents

Circuit breaker Download PDF

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JP6369637B2
JP6369637B2 JP2017540387A JP2017540387A JP6369637B2 JP 6369637 B2 JP6369637 B2 JP 6369637B2 JP 2017540387 A JP2017540387 A JP 2017540387A JP 2017540387 A JP2017540387 A JP 2017540387A JP 6369637 B2 JP6369637 B2 JP 6369637B2
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switching
contacts
contact
switching contacts
opening
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JPWO2017046885A1 (en
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伸郎 三好
伸郎 三好
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Mitsubishi Electric Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/59—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle
    • H01H33/596—Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the ac cycle for interrupting dc
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/18—Means for extinguishing or suppressing arc
    • 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
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/541—Contacts shunted by semiconductor devices
    • 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
    • H01H9/54—Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
    • H01H9/541—Contacts shunted by semiconductor devices
    • H01H9/542—Contacts shunted by static switch means

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Breakers (AREA)
  • Keying Circuit Devices (AREA)

Description

この発明は、高電圧の直流回路を遮断する回路遮断器に関するものである。   The present invention relates to a circuit breaker that cuts off a high-voltage DC circuit.

直流回路用の回路遮断器を高電圧化する方法としては、回路遮断器を構成する開閉接点の開離距離を回路電圧に合わせて大きくとることで、開離時のアーク電圧を上昇させる方法が一般的であるが、開閉接点の開離距離を大きくとることは回路遮断器の大形化につながるため、昨今の小形化のニーズに反するという問題がある。
そのため、開閉接点の開離距離を大きくすることなく、直流回路を遮断する方式として、開閉接点間に半導体スイッチを並列接続し、開閉接点の開閉動作時に電流を半導体スイッチに転流させて開閉接点間に生じたアークを素早く消滅させた後、この半導体スイッチをＯＦＦして電流を遮断する技術が提案されている（例えば、特許文献１および２参照）。As a method of increasing the voltage of a circuit breaker for a DC circuit, there is a method of increasing the arc voltage at the time of opening by increasing the opening distance of the switching contacts constituting the circuit breaker according to the circuit voltage. Although it is general, increasing the switching distance of the switching contacts leads to an increase in the size of the circuit breaker, which is contrary to the recent needs for downsizing.
Therefore, as a method of interrupting the DC circuit without increasing the opening distance of the switching contacts, a semiconductor switch is connected in parallel between the switching contacts, and current is commutated to the semiconductor switch during the switching operation of the switching contacts to switch the switching contacts A technique has been proposed in which an arc generated in the middle is quickly extinguished and then the semiconductor switch is turned off to cut off the current (see, for example, Patent Documents 1 and 2).

特開２０１２−２４８４４５号公報JP2012-248445A 特開２０１４−３８７７５号公報JP 2014-38775 A

以上のように構成された従来の回路遮断器では、定格電流に合わせて半導体スイッチを選定すると、大きい遮断電流、例えば１ｋＡを超える電流を遮断する場合、半導体スイッチが破壊にいたる恐れがある。また、大電流に合わせて半導体スイッチを選定した場合、半導体スイッチの大きさが、回路遮断器と比べかなり大きくなるという問題があった。   In the conventional circuit breaker configured as described above, if a semiconductor switch is selected in accordance with the rated current, if a large breaking current, for example, a current exceeding 1 kA is cut off, the semiconductor switch may be broken. In addition, when a semiconductor switch is selected in accordance with a large current, there is a problem that the size of the semiconductor switch is considerably larger than that of a circuit breaker.

本発明は、１００Ａ以下の小電流から１ｋＡを超えるような事故電流まで安定した遮断ができる直流の高電圧対応の回路遮断器を得ることを目的としている。   An object of the present invention is to obtain a DC circuit breaker that can stably shut down from a small current of 100 A or less to an accident current exceeding 1 kA.

本発明の回路遮断器は、電路を開閉する第一の開閉接点と、この第一の開閉接点に直列に接続され、電路を開閉する第二の開閉接点と、第二の開閉接点の両端に並列に接続され、電路を開閉する半導体スイッチと、前記第一の開閉接点より早く前記第二の開閉接点を閉成し、前記第一の開閉接点より遅く前記第二の開閉接点を開成する開閉機構と、を備え、半導体スイッチは、投入時には第一の開閉接点および第二の開閉接点の閉成後に閉成され、遮断時には第一の開閉接点および第二の開閉接点の開成後に開成されるものである。


The circuit breaker of the present invention includes a first switching contact that opens and closes an electric circuit, a second switching contact that is connected in series to the first switching contact and opens and closes the electric circuit, and both ends of the second switching contact. A semiconductor switch connected in parallel to open and close the electrical circuit, and an open / close to close the second open / close contact earlier than the first open / close contact and open the second open / close contact later than the first open / close contact And the semiconductor switch is closed after the first switching contact and the second switching contact are closed when turned on, and is opened after the first switching contact and the second switching contact are opened when shutting off. Is.


本発明の回路遮断器によれば、直流電路を開閉する第一の開閉接点と、この第一の開閉接点と直列に接続された半導体スイッチと、半導体スイッチの両端に並列接続された第二の開閉接点と、を設け、半導体スイッチは、投入時には第一の開閉接点および第二の開閉接点の閉成後に閉成され、遮断時には第一の開閉接点および第二の開閉接点の開成後に開成されるので、小電流から事故電流までの直流電流を安定して遮断することができる。   According to the circuit breaker of the present invention, the first switching contact for opening and closing the DC circuit, the semiconductor switch connected in series with the first switching contact, and the second connected in parallel to both ends of the semiconductor switch The semiconductor switch is closed after the first switching contact and the second switching contact are closed when the switch is turned on, and is opened after the first switching contact and the second switching contact are opened when the semiconductor switch is shut off. Therefore, the direct current from the small current to the accident current can be stably interrupted.

本発明の実施の形態１における回路遮断器の構成を示す回路図である。It is a circuit diagram which shows the structure of the circuit breaker in Embodiment 1 of this invention. 本発明の実施の形態２における回路遮断器の構成を示す回路図である。It is a circuit diagram which shows the structure of the circuit breaker in Embodiment 2 of this invention. 本発明の実施の形態２における回路遮断器の概略構成を示す構成図である。It is a block diagram which shows schematic structure of the circuit breaker in Embodiment 2 of this invention. 本発明の実施の形態３における回路遮断器の構成を示す回路図である。It is a circuit diagram which shows the structure of the circuit breaker in Embodiment 3 of this invention. 本発明の実施の形態３における回路遮断器の正面図である。It is a front view of the circuit breaker in Embodiment 3 of this invention. 図４に示す線ｘ−ｘに沿った断面図である。FIG. 5 is a cross-sectional view taken along line xx shown in FIG. 4. 図４に示す線ｙ−ｙに沿った断面図である。FIG. 5 is a cross-sectional view taken along line yy shown in FIG. 4. 図７に示す第一の開閉接点、第二の開閉接点、クロスバー、およびアクチュエーの動作を説明するための説明図で、（ａ）はＯＦＦ状態、（ｂ）はＯＦＦからＯＮへの動作途中の状態、（ｃ）はＯＮ状態である。8A and 8B are explanatory diagrams for explaining the operations of the first switching contact, the second switching contact, the crossbar, and the actuator shown in FIG. 7, in which FIG. (C) is an ON state.

図１は本発明の実施の形態１における回路遮断器の構成を示す回路図である。
図１において、回路遮断器１００は、直流電路２００に接続され、直流電路２００を開閉する第一の開閉接点１ａ、１ｂと、この第一の開閉接点１ａ、１ｂにそれぞれ直列に接続され、直流電路２００を開閉する第二の開閉接点２ａ、２ｂと、第一の開閉接点１ａ、１ｂおよび第二の開閉接点２ａ、２ｂを開閉する開閉機構３と、第二の開閉接点２ａ、２ｂの両端にそれぞれ並列に接続され、直流電路２００を開閉する半導体スイッチ４ａ、４ｂと、直流電路２００を流れる電流が所定の値を超えると、その電流の値に応じた時限で開閉機構３を駆動して第一の開閉接点１ａ、１ｂを遮断する引外し装置５ａ、５ｂと、引外し装置５ａの負荷側および引外し装置５ｂの負荷側に接続され、半導体スイッチ４ａ、４ｂを駆動するゲート駆動回路６とを備えている。
また、第二の開閉接点２ａ、２ｂは、第一の開閉接点１ａ、１ｂの開閉動作に連動し、開閉される。FIG. 1 is a circuit diagram showing a configuration of a circuit breaker according to Embodiment 1 of the present invention.
In FIG. 1, a circuit breaker 100 is connected to a DC circuit 200, and is connected in series to first switching contacts 1a and 1b that open and close the DC circuit 200, and to the first switching contacts 1a and 1b, respectively. The second switching contacts 2a and 2b for opening and closing the electric circuit 200, the switching mechanism 3 for opening and closing the first switching contacts 1a and 1b and the second switching contacts 2a and 2b, and both ends of the second switching contacts 2a and 2b Are connected in parallel to each other, and the semiconductor switches 4a and 4b for opening and closing the DC circuit 200, and when the current flowing through the DC circuit 200 exceeds a predetermined value, the switching mechanism 3 is driven in a time limit corresponding to the value of the current. Tripping devices 5a and 5b for blocking the first switching contacts 1a and 1b, and a gate drive circuit connected to the load side of the tripping device 5a and the load side of the tripping device 5b and driving the semiconductor switches 4a and 4b It is equipped with a door.
The second switching contacts 2a and 2b are opened and closed in conjunction with the switching operation of the first switching contacts 1a and 1b.

半導体スイッチ４ａは、ダイオード４ａ３を逆並列に接続した半導体素子４ａ１と、ダイオード４ａ４を逆並列に接続した半導体素子４ａ２とが互いに逆極性に直列接続されている。
また、半導体スイッチ４ｂは、ダイオード４ｂ３を逆並列に接続した半導体素子４ｂ１と、ダイオード４ｂ４を逆並列に接続した半導体素子４ｂ２とが互いに逆極性に直列接続されている。In the semiconductor switch 4a, a semiconductor element 4a1 in which diodes 4a3 are connected in antiparallel and a semiconductor element 4a2 in which diodes 4a4 are connected in antiparallel are connected in series with opposite polarities.
In the semiconductor switch 4b, the semiconductor element 4b1 having the diode 4b3 connected in antiparallel and the semiconductor element 4b2 having the diode 4b4 connected in antiparallel are connected in series with opposite polarities.

次に、回路遮断器１００の動作について説明する。まず、回路遮断器１００の投入動作について説明する。
開閉機構３を操作し、第一の開閉接点１ａ、１ｂおよび第二の開閉接点２ａ、２ｂの閉成動作を行うと、まず、第二の開閉接点２ａ、２ｂの閉成動作が完了し、その後に第一の開閉接点１ａ、１ｂの閉成動作が完了する。これにより、回路遮断器１００を直流電路２００の電流が流れ始める。Next, the operation of the circuit breaker 100 will be described. First, the closing operation of the circuit breaker 100 will be described.
When the opening / closing mechanism 3 is operated to close the first switching contacts 1a, 1b and the second switching contacts 2a, 2b, the closing operation of the second switching contacts 2a, 2b is completed first. Thereafter, the closing operation of the first switching contacts 1a and 1b is completed. Thereby, the current of the DC circuit 200 starts to flow through the circuit breaker 100.

そうすると、半導体スイッチ４ａ、４ｂを駆動するゲート駆動回路６に電源が供給されるので、ゲート駆動回路６に駆動され半導体スイッチ４ａ、４ｂがオンとなる。これにより、第一の開閉接点１ａ、１ｂ、第二の開閉接点２ａ、２ｂ、および半導体スイッチ４ａ、４ｂの投入動作が完了する。このとき、半導体スイッチ４ａ、４ｂのオン抵抗は、第二の開閉接点２ａ、２ｂのオン抵抗より大きいので、電流は、実質的に第二の開閉接点２ａ、２ｂの方を流れることとなる。   Then, since power is supplied to the gate drive circuit 6 that drives the semiconductor switches 4a and 4b, the semiconductor switches 4a and 4b are turned on by being driven by the gate drive circuit 6. As a result, the first switching contacts 1a and 1b, the second switching contacts 2a and 2b, and the semiconductor switches 4a and 4b are turned on. At this time, since the on-resistance of the semiconductor switches 4a and 4b is larger than the on-resistance of the second switching contacts 2a and 2b, the current substantially flows through the second switching contacts 2a and 2b.

次に、回路遮断器１００の遮断動作について説明する。
図示しない操作スイッチ、もしくは、引外し装置５ａ、５ｂに開閉機構３が駆動され、まず、第一の開閉接点１ａ、１ｂの開離動作が開始される。第一の開閉接点１ａ、１ｂが開離すると、第一の開閉接点１ａ、１ｂの各接点間にアークが発生し、第一の開閉接点１ａ、１ｂの各接点間を流れる電流は限流される。Next, the breaking operation of the circuit breaker 100 will be described.
The opening / closing mechanism 3 is driven by an operation switch (not shown) or tripping devices 5a, 5b, and first, opening operation of the first opening / closing contacts 1a, 1b is started. When the first switching contacts 1a and 1b are separated, an arc is generated between the first switching contacts 1a and 1b, and the current flowing between the first switching contacts 1a and 1b is limited. .

さらに、第一の開閉接点１ａ、１ｂの開離動作がさらに進むと、第二の開閉接点２ａ、２ｂの開離動作も開始される。第二の開閉接点２ａ、２ｂが開離すると、第二の開閉接点２ａ、２ｂの各接点間にもアークが発生し、第二の開閉接点２ａ、２ｂの各接点間の電圧が上昇することとなり、第一の開閉接点１ａ、１ｂおよび第二の開閉接点２ａ、２ｂの各接点間を流れる電流はさらに限流されるとともに、第二の開閉接点２ａ、２ｂを流れる電流は、半導体スイッチ４ａ、４ｂにそれぞれ転流されることとなる。そして、第一の開閉接点１ａ、１ｂおよび第二の開閉接点２ａ、２ｂの開離から所定時間（例えば、１５ｍｓｅｃ）が経過し、充分、通電電流が限流された後に、ゲート駆動回路６が半導体スイッチ４ａ、４ｂのゲート駆動を停止し、半導体スイッチ４ａ、４ｂがオフすることで、直流電路２００の遮断が完了する。   Further, when the opening operation of the first switching contacts 1a and 1b further proceeds, the opening operation of the second switching contacts 2a and 2b is also started. When the second switching contacts 2a and 2b are separated, an arc is generated between the contacts of the second switching contacts 2a and 2b, and the voltage between the contacts of the second switching contacts 2a and 2b increases. The current flowing between the first switching contacts 1a and 1b and the second switching contacts 2a and 2b is further limited, and the current flowing through the second switching contacts 2a and 2b is limited to the semiconductor switch 4a, 4b will be commutated. Then, after a predetermined time (for example, 15 msec) has elapsed from the opening of the first switching contacts 1a and 1b and the second switching contacts 2a and 2b and the energization current is sufficiently limited, the gate drive circuit 6 The gate drive of the semiconductor switches 4a and 4b is stopped and the semiconductor switches 4a and 4b are turned off, whereby the interruption of the DC circuit 200 is completed.

ゲート駆動回路６の半導体スイッチ４ａ、４ｂのゲート駆動の停止が、第二の開閉接点２ａ、２ｂの開離後となる遅延動作は、開閉機構３からの信号に基づいて構成することが可能である。また、別の方法としては、第一の開閉接点１ａ、１ｂの各接点間にアークが発生すること、および第二の開閉接点２ａ、２ｂの各接点間にアークが発生することで、両開閉接点間の電圧が上昇しゲート駆動回路６への印加電圧が低下するので、この電圧の低下に基づいて遅延動作の回路を構成することも可能である。   The delay operation in which the gate drive of the semiconductor switches 4a and 4b of the gate drive circuit 6 is stopped after the second switching contacts 2a and 2b are opened can be configured based on a signal from the switching mechanism 3. is there. As another method, an arc is generated between the contacts of the first switching contacts 1a and 1b, and an arc is generated between the contacts of the second switching contacts 2a and 2b. Since the voltage between the contacts increases and the voltage applied to the gate drive circuit 6 decreases, it is possible to configure a circuit for a delay operation based on the decrease in the voltage.

なお、図１に示す回路図では、第一の開閉接点１ａ、１ｂが直流電路２００側で、第二の開閉接点２ａ、２ｂが負荷３００側として示したが、逆配置の第一の開閉接点１ａ、１ｂが負荷３００側で、第二の開閉接点２ａ、２ｂが直流電路２００側に設けられていてもよい。ゲート駆動回路６は、第一の開閉接点１ａ、１ｂおよび第二の開閉接点２ａ、２ｂよりも負荷３００側に設けることが望ましい。また、電源と負荷の逆接続を考慮すると第一の開閉接点１ａ、１ｂと第二の開閉接点２ａ、２ｂとの間に設け、正接続および逆接続のどちらでもゲート駆動回路６への電源供給が遮断される構成が望ましい。   In the circuit diagram shown in FIG. 1, the first switching contacts 1a and 1b are shown on the DC circuit 200 side, and the second switching contacts 2a and 2b are shown on the load 300 side. 1a and 1b may be provided on the load 300 side, and the second switching contacts 2a and 2b may be provided on the DC circuit 200 side. The gate drive circuit 6 is desirably provided on the load 300 side with respect to the first switching contacts 1a and 1b and the second switching contacts 2a and 2b. In consideration of the reverse connection of the power source and the load, it is provided between the first switching contacts 1a and 1b and the second switching contacts 2a and 2b, and power is supplied to the gate drive circuit 6 by either the normal connection or the reverse connection. A configuration in which is blocked is desirable.

本実施の形態によれば、直流電路２００を開閉する第一の開閉接点１ａ、１ｂと、この第一の開閉接点１ａ、１ｂと直列に接続された半導体スイッチ４ａ、４ｂと、この半導体スイッチ４ａ、４ｂの両端に並列接続された第二の開閉接点２ａ、２ｂと、を設け、半導体スイッチ４ａ、４ｂは、投入時には第一の開閉接点１ａ、１ｂおよび第二の開閉接点２ａ、２ｂの閉成後に閉成され、遮断時には第一の開閉接点１ａ、１ｂおよび第二の開閉接点２ａ、２ｂの開成後に開成されるので、小電流から地絡電流までの直流電流を安定して遮断することができる。   According to the present embodiment, the first switching contacts 1a and 1b for opening and closing the DC circuit 200, the semiconductor switches 4a and 4b connected in series with the first switching contacts 1a and 1b, and the semiconductor switch 4a. 4b, the second switching contacts 2a and 2b connected in parallel to both ends of the semiconductor switch 4a and 4b are provided. When the semiconductor switches 4a and 4b are turned on, the first switching contacts 1a and 1b and the second switching contacts 2a and 2b are closed. Since it is closed after the formation and is opened after the first switching contacts 1a and 1b and the second switching contacts 2a and 2b are opened, the DC current from a small current to a ground fault current can be stably blocked. Can do.

また、第一の開閉接点１ａ、１ｂより早く第二の開閉接点２ａ、２ｂを閉成し、第一の開閉接点１ａ、１ｂより遅く第二の開閉接点２ａ、２ｂを開成する開閉機構３を備えたので、遮断時の遮断電流が第一の開閉接点１ａ、１ｂの開離により十分限流された後に、第二の開閉接点２ａ、２ｂから半導体スイッチ４ａ、４ｂへの転流が行われるため、半導体スイッチ４ａ、４ｂを損傷するおそれがない。   The switching mechanism 3 is configured to close the second switching contacts 2a and 2b earlier than the first switching contacts 1a and 1b and open the second switching contacts 2a and 2b later than the first switching contacts 1a and 1b. Since the cut-off current at the time of cut-off is sufficiently limited by the opening of the first switch contacts 1a and 1b, commutation from the second switch contacts 2a and 2b to the semiconductor switches 4a and 4b is performed. Therefore, there is no possibility of damaging the semiconductor switches 4a and 4b.

実施の形態２．
図２は本発明の実施の形態２における回路遮断器の構成を示す回路図、図３は本発明の実施の形態２における回路遮断器の概略構成を示す構成図である。
図２、３において、回路遮断器１０１は、一端に直流電路２００の正極が接続され第一の開閉接点１１ａが設けられた極１１と、一端に直流電路２００の負極が接続され第一の開閉接点１２ａが設けられた極１２と、、一端に極１１の他端が接続され第二の開閉接点１３ａが設けられた極１３と、一端に極１２の他端が接続され第二の開閉接点１４ａが設けられた極１４と、極１１の他端および極１３の他端間に接続された半導体スイッチ１５ａと、極１２の他端および極１４の他端間に接続された半導体スイッチ１５ｂと、第一の開閉接点１１ａ、１２ａ、および第二の開閉接点１３ａ、１４ａを開閉する開閉機構３ａと、極１１の他端および極１２の他端間に接続され、半導体スイッチ１５ａ、１５ｂのゲートを駆動するゲート駆動回路６ａと、を備えた４極の回路遮断器である。そして、極１３の他端および極１４の他端には負荷３００が接続されているEmbodiment 2. FIG.
FIG. 2 is a circuit diagram showing the configuration of the circuit breaker according to Embodiment 2 of the present invention, and FIG. 3 is a block diagram showing the schematic configuration of the circuit breaker according to Embodiment 2 of the present invention.
2 and 3, the circuit breaker 101 includes a pole 11 having one end connected to the positive electrode of the DC circuit 200 and the first switching contact 11a, and one end connected to the negative electrode of the DC circuit 200. A pole 12 provided with a contact 12a, a pole 13 provided with one end connected to the other end of the pole 11 and a second switching contact 13a, and a second switching contact provided with the other end of the pole 12 connected to one end. A pole 14 provided with 14a, a semiconductor switch 15a connected between the other end of the pole 11 and the other end of the pole 13, and a semiconductor switch 15b connected between the other end of the pole 12 and the other end of the pole 14. The open / close mechanism 3a for opening and closing the first open / close contacts 11a and 12a and the second open / close contacts 13a and 14a is connected between the other end of the pole 11 and the other end of the pole 12, and the gates of the semiconductor switches 15a and 15b. Drive circuit for driving And a, a circuit breaker 4-pole equipped with. A load 300 is connected to the other end of the pole 13 and the other end of the pole 14.

また、第一の開閉接点１１ａと極１１の他端間には引外し装置１１ｂが、第一の開閉接点１２ａと極１２の他端間には引外し装置１２ｂが、第二の開閉接点１３ａと極１３の他端間には引外し装置１３ｂが、第二の開閉接点１４ａと極１４の他端間には引外し装置１４ｂが、それぞれ設けられている。半導体スイッチ１５ａ、１５ｂの構成は、実施の形態１で説明した半導体スイッチ４ａ、４ｂの構成と同様なので説明は省略する。   A tripping device 11b is provided between the first switching contact 11a and the other end of the pole 11, and a tripping device 12b is provided between the first switching contact 12a and the other end of the pole 12, and a second switching contact 13a. A tripping device 13b is provided between the other end of the pole 13 and a tripping device 14b is provided between the second switching contact 14a and the other end of the pole 14, respectively. Since the configuration of the semiconductor switches 15a and 15b is the same as the configuration of the semiconductor switches 4a and 4b described in the first embodiment, the description thereof is omitted.

そして、第一の開閉接点１１ａ、１２ａの開離距離は、第二の開閉接点１３ａ、１４ａの開離距離より大きく設定されている。この開離距離の違いにより、投入時は、第一の開閉接点１１ａ、１２ａより早く第二の開閉接点１３ａ、１４ａが閉成され、遮断時には、第二の開閉接点１３ａ、１４ａは第一の開閉接点１１ａ、１２ａより遅く開成される。
次に、回路遮断器１０１の動作について説明する。まず、回路遮断器１０１の投入動作について説明する。The opening distance of the first switching contacts 11a and 12a is set larger than the opening distance of the second switching contacts 13a and 14a. Due to the difference in the opening distance, the second switching contacts 13a, 14a are closed earlier than the first switching contacts 11a, 12a when being turned on, and the second switching contacts 13a, 14a are closed when shutting off. It is opened later than the switching contacts 11a and 12a.
Next, the operation of the circuit breaker 101 will be described. First, the closing operation of the circuit breaker 101 will be described.

開閉機構３ａを操作し、第一の開閉接点１１ａ、１２ａおよび第二の開閉接点１３ａ、１４ａの閉成動作を行うと、第二の開閉接点１３ａ、１４ａの開離距離は、第一の開閉接点１１ａ、１２ａの開離距離より小さいので、まず、第二の開閉接点１３ａ、１４ａの閉成動作が完了し、その後に第一の開閉接点１１ａ、１２ａの閉成動作が完了する。これにより、回路遮断器１０１を直流電路２００の電流が流れ始める。   When the switching mechanism 3a is operated and the first switching contacts 11a, 12a and the second switching contacts 13a, 14a are closed, the opening distance of the second switching contacts 13a, 14a is the first switching Since it is smaller than the opening distance of the contacts 11a, 12a, the closing operation of the second switching contacts 13a, 14a is completed first, and then the closing operation of the first switching contacts 11a, 12a is completed. Thereby, the current of the DC circuit 200 starts to flow through the circuit breaker 101.

そうすると、半導体スイッチ１５ａ、１５ｂを駆動するゲート駆動回路６ａに電源が供給されるので、ゲート駆動回路６ａに駆動されて半導体スイッチ１５ａ、１５ｂがオンする。これにより、第一の開閉接点１１ａ、１２ａ、第二の開閉接点１３ａ、１４ａ、および半導体スイッチ１５ａ、１５ｂの投入動作が完了する。このとき、半導体スイッチ１５ａ、１５ｂのオン抵抗は、第二の開閉接点１３ａ、１４ａのオン抵抗より大きいので、電流は、実質的に第二の開閉接点１３ａ、１４ａの方を流れることとなる。   Then, since power is supplied to the gate drive circuit 6a that drives the semiconductor switches 15a and 15b, the semiconductor switches 15a and 15b are turned on by being driven by the gate drive circuit 6a. Thereby, the first switching contacts 11a and 12a, the second switching contacts 13a and 14a, and the semiconductor switches 15a and 15b are turned on. At this time, since the ON resistance of the semiconductor switches 15a and 15b is larger than the ON resistance of the second switching contacts 13a and 14a, the current substantially flows through the second switching contacts 13a and 14a.

次に、回路遮断器１０１の遮断動作について説明する。
図示しない操作スイッチもしくは、引外し装置１１ｂ、１２ｂ、１３ｂ、１４ｂによって、開閉機構３ａが駆動され、まず、第一の開閉接点１１ａ、１２ａの開離動作が開始される。第一の開閉接点１１ａ、１２ａが開離されると、第一の開閉接点１１ａ、１２ａの各接点間にアークが発生し、第一の開閉接点１１ａ、１２ａの各接点間を流れる電流は限流される。Next, the breaking operation of the circuit breaker 101 will be described.
The opening / closing mechanism 3a is driven by an operation switch (not shown) or tripping devices 11b, 12b, 13b, 14b, and first, the opening operation of the first switching contacts 11a, 12a is started. When the first switching contacts 11a and 12a are separated, an arc is generated between the first switching contacts 11a and 12a, and the current flowing between the first switching contacts 11a and 12a is limited. It is.

さらに、第一の開閉接点１１ａ、１２ａの開離動作がさらに進むと、第二の開閉接点１３ａ、１４ａの開離動作が開始され、第二の開閉接点１３ａ、１４ａの各接点間にアークが発生し第二の開閉接点１３ａ、１４ａの各接点間の電圧が上昇する。この各接点間の電圧上昇により、第二の開閉接点１３ａ、１４ａを流れる電流は、半導体スイッチ１５ａ、１５ｂにそれぞれ転流される。そして、第一の開閉接点１１ａ、１２ａおよび第二の開閉接点１３ａ、１４ａの開離から所定時間以上（例えば、１５ｍｓｅｃ）が経過し、充分、通電電流が限流された後に、ゲート駆動回路６ａが半導体スイッチ１５ａ、１５ｂのゲート駆動を停止し、半導体スイッチ１５ａ、１５ｂがオフすることで、直流電路２００の遮断が完了する。   Further, when the opening operation of the first switching contacts 11a and 12a further proceeds, the opening operation of the second switching contacts 13a and 14a is started, and an arc is generated between the respective contacts of the second switching contacts 13a and 14a. The voltage between the contacts of the second switching contacts 13a and 14a is increased. Due to the voltage increase between the contacts, currents flowing through the second switching contacts 13a and 14a are commutated to the semiconductor switches 15a and 15b, respectively. Then, after a predetermined time or longer (for example, 15 msec) has elapsed since the opening of the first switching contacts 11a and 12a and the second switching contacts 13a and 14a, and the energization current is sufficiently limited, the gate drive circuit 6a Stops the gate drive of the semiconductor switches 15a and 15b, and the semiconductor switches 15a and 15b are turned off, whereby the interruption of the DC circuit 200 is completed.

なお、本実施の形態では、直流電路２００が一端に接続された極１１、１２に設けられた開閉接点１１ａ、１２ａを請求の範囲でいう第一の開閉接点とし、負荷３００が他端に接続された極１３、１４に設けられた開閉接点１３ａ、１４ａを請求の範囲でいう第二の開閉接点としたが、開閉接点１１ａ、１２ａを第二の開閉接点とし、開閉接点１３ａ、１４ａを第一の開閉接点としてもよい。その場合は、開閉接点１１ａ、１２ａの開離距離は、開閉接点１３ａ、１４ａの開離距離より小さく設定する。   In this embodiment, the switching contacts 11a and 12a provided on the poles 11 and 12 to which the DC circuit 200 is connected at one end are used as the first switching contact in the claims, and the load 300 is connected to the other end. The open / close contacts 13a and 14a provided on the poles 13 and 14 are the second open / close contacts in the claims, but the open / close contacts 11a and 12a are the second open / close contacts and the open / close contacts 13a and 14a are the second open / close contacts. One switching contact may be used. In that case, the opening distance of the switching contacts 11a, 12a is set smaller than the opening distance of the switching contacts 13a, 14a.

本実施の形態によれば、直流電路２００を開閉する第一の開閉接点１１ａ、１２ａと、この第一の開閉接点１１ａ、１２ａと直列に接続された半導体スイッチ１５ａ、１４ｂと、半導体スイッチ１５ａ、１４ｂの両端に並列接続された第二の開閉接点１３ａ、１４ａと、を設け、半導体スイッチ１５ａ、１４ｂは、投入時には第一の開閉接点１１ａ、１２ａおよび第二の開閉接点１３ａ、１４ａの閉成後に閉成され、遮断時には第一の開閉接点１１ａ、１２ａおよび第二の開閉接点１３ａ、１４ａの開成後に開成されるので、小電流から地絡電流までの直流電流を安定して遮断することができる。   According to the present embodiment, the first switching contacts 11a and 12a that open and close the DC circuit 200, the semiconductor switches 15a and 14b connected in series with the first switching contacts 11a and 12a, the semiconductor switch 15a, The second switch contacts 13a and 14a connected in parallel to both ends of the switch 14b are provided. When the semiconductor switches 15a and 14b are turned on, the first switch contacts 11a and 12a and the second switch contacts 13a and 14a are closed. It is closed later, and at the time of interruption, it is opened after the opening of the first switching contacts 11a, 12a and the second switching contacts 13a, 14a, so that it is possible to stably cut off a direct current from a small current to a ground fault current. it can.

また、第一の開閉接点１１ａ、１２ａより早く第二の開閉接点１３ａ、１４ａを閉成し、第一の開閉接点１１ａ、１２ａより遅く第二の開閉接点１３ａ、１４ａを開成する開閉機構３ａを備えたので、遮断時の遮断電流が第一の開閉接点１１ａ、１２ａの開離により十分限流された後に、第二の開閉接点１３ａ、１４ａから半導体スイッチ１５ａ、１５ｂへの転流が行われるため、半導体スイッチ１５ａ、１５ｂを損傷するおそれがない。   Further, an opening / closing mechanism 3a for closing the second switching contacts 13a, 14a earlier than the first switching contacts 11a, 12a and opening the second switching contacts 13a, 14a later than the first switching contacts 11a, 12a is provided. Since the cut-off current at the time of cut-off is sufficiently limited by the opening of the first switch contacts 11a and 12a, commutation from the second switch contacts 13a and 14a to the semiconductor switches 15a and 15b is performed. Therefore, there is no possibility of damaging the semiconductor switches 15a and 15b.

第一の開閉接点１１ａ、１２ａの開離距離を、第二の開閉接点１３ａ、１４ａの開離距離より大きくすることで、第一の開閉接点１１ａ、１２ａより早く第二の開閉接点１３ａ、１４ａを閉成し、第一の開閉接点１１ａ、１２ａより遅く第二の開閉接点１３ａ、１４ａを開成するため、既存の開閉機構３ａを流用することができる。   By making the opening distance of the first switching contacts 11a, 12a larger than the opening distance of the second switching contacts 13a, 14a, the second switching contacts 13a, 14a earlier than the first switching contacts 11a, 12a. Is closed and the second switching contacts 13a and 14a are opened later than the first switching contacts 11a and 12a, so that the existing switching mechanism 3a can be used.

実施の形態３．
図４は本発明の実施の形態２における回路遮断器の構成を示す回路図、図５は本発明の実施の形態３における回路遮断器を示す正面図、図６は図４に示す線ｘ−ｘに沿った断面図、図７は図４に示す線ｙ−ｙに沿った断面図、図８は図７に示す第一の開閉接点、第二の開閉接点、クロスバー、およびアクチュエータの動作を説明するための説明図で、（ａ）はＯＦＦ状態、（ｂ）はＯＦＦからＯＮへの動作途中の状態、（ｃ）はＯＮ状態である。Embodiment 3 FIG.
4 is a circuit diagram showing the configuration of the circuit breaker according to the second embodiment of the present invention, FIG. 5 is a front view showing the circuit breaker according to the third embodiment of the present invention, and FIG. 6 is a line x− shown in FIG. FIG. 7 is a cross-sectional view taken along line yy shown in FIG. 4, and FIG. 8 is an operation of the first switching contact, the second switching contact, the crossbar, and the actuator shown in FIG. (A) is an OFF state, (b) is a state during the operation from OFF to ON, and (c) is an ON state.

図４において、回路遮断器１０２は、一端に直流電路２００の正極が接続され第一の開閉接点４１ａが設けられた極４１と、一端に直流電路２００の負極が接続され第一の開閉接点４２ａが設けられた極４２と、、一端に負荷３００の正極が接続され第一の開閉接点４３ａが設けられた極４３と、一端に負荷３００の負極が接続され第一の開閉接点４４ａが設けられた極４４と、極４１の他端および極４３の他端間に接続された半導体スイッチ４５ａと、極４２の他端および極４４の他端間に接続された半導体スイッチ４５ｂと、第一の開閉接点４１ａ、４２ａ、４３ａ、４４ａを開閉する開閉機構３０と、を有する４極の回路遮断器である。   In FIG. 4, the circuit breaker 102 has a pole 41 having one end connected to the positive electrode of the DC circuit 200 and a first switching contact 41a, and one end connected to the negative electrode of the DC circuit 200 and a first switching contact 42a. , A pole 43 having one end connected to the positive electrode of the load 300 and the first switching contact 43a, and a terminal having one end connected to the negative electrode of the load 300 and the first switching contact 44a. A pole 44, a semiconductor switch 45a connected between the other end of the pole 41 and the other end of the pole 43, a semiconductor switch 45b connected between the other end of the pole 42 and the other end of the pole 44, And a switching mechanism 30 for opening and closing the switching contacts 41a, 42a, 43a, and 44a.

また、第一の開閉接点４１ａと極４１の他端間には引外し装置４１ｂが、第一の開閉接点４２ａと極４２の他端間には引外し装置４２ｂが、第一の開閉接点４３ａと極４３の他端間には引外し装置４３ｂが、第一の開閉接点４４ａと極４４の他端間には引外し装置４４ｂが、それぞれ設けられている。
さらに、極４１の他端と極４３の他端の間には、第二の開閉接点４６ａが半導体スイッチ４５ａに対し並列接続されており、極４２の他端と極４４の他端の間には、第二の開閉接点４６ｂが半導体スイッチ４５ｂに対し並列接続されている。半導体スイッチ４５ａ、４５ｂの構成は、実施の形態１で説明した半導体スイッチ４ａ、４ｂの構成と同様なので説明は省略する。Further, a tripping device 41b is provided between the first switching contact 41a and the other end of the pole 41, and a tripping device 42b is provided between the first switching contact 42a and the other end of the pole 42, and the first switching contact 43a. A tripping device 43 b is provided between the other end of the pole 43 and a tripping device 44 b is provided between the first switching contact 44 a and the other end of the pole 44.
Further, a second switching contact 46 a is connected in parallel to the semiconductor switch 45 a between the other end of the pole 41 and the other end of the pole 43, and between the other end of the pole 42 and the other end of the pole 44. The second switching contact 46b is connected in parallel to the semiconductor switch 45b. The configuration of the semiconductor switches 45a and 45b is the same as the configuration of the semiconductor switches 4a and 4b described in the first embodiment, and a description thereof will be omitted.

次に、回路遮断器１０２の構造について説明する。図５、図６に示すように、回路遮断器１０２は、絶縁材料で形成されたベース２０ａとカバー２０ｂとからなる筐体２０を用いて構成される。ベース２０ａ上には、各極４１〜４４が互いに並列に配置され、極４１〜４４の上部には、周知のトグルリンク機構を有する開閉機構３０が配置される。カバー２０ｂは、ベース２０ａ上の各極と開閉機構３０を覆い、開閉機構３０の操作ハンドル３１はカバー２０ｂの窓２０ｂ１から突出する。
各極は、互いに同じに構成され、クロスバー３２は、各極４１〜４４に直交するように、ベース２０ａ上に配置されている。Next, the structure of the circuit breaker 102 will be described. As shown in FIGS. 5 and 6, the circuit breaker 102 is configured by using a housing 20 including a base 20 a and a cover 20 b made of an insulating material. The poles 41 to 44 are arranged in parallel with each other on the base 20a, and an opening / closing mechanism 30 having a well-known toggle link mechanism is arranged above the poles 41 to 44. The cover 20b covers each pole on the base 20a and the opening / closing mechanism 30, and the operation handle 31 of the opening / closing mechanism 30 projects from the window 20b1 of the cover 20b.
The respective poles are configured in the same manner, and the cross bar 32 is disposed on the base 20a so as to be orthogonal to the respective poles 41 to 44.

各極は、ベース２０ａに設けられた電源側端子２４と、この電源側端子２４より延設された固定接触子２７に設けられた固定接点２１と、この固定接点２１と接触および開離する可動接点２２と、この可動接点２２が一端に設けられ、クロスバー３２により回動自由に保持される可動接触子２３と、この可動接触子２３に可動子ホルダー２６を介して接続された引外し装置４１ｂ、４２ｂ、４３ｂ、４４ｂと、引外し装置４１ｂ、４２ｂ、４３ｂ、４４ｂと一体となっている負荷側端子２５と、をそれぞれ有する。
各極の固定接点２１と可動接点２２とで、大電流遮断時に電路を最初に開閉する第一の開閉接点４１ａ、４２ａ、４３ａ、４４ａをそれぞれ構成している。Each pole has a power supply side terminal 24 provided on the base 20 a, a fixed contact 21 provided on a fixed contact 27 extending from the power supply side terminal 24, and a movable contacted with and separating from the fixed contact 21. A contact 22, a movable contact 23 provided at one end and rotatably held by a cross bar 32, and a tripping device connected to the movable contact 23 via a mover holder 26 41b, 42b, 43b, 44b and a load side terminal 25 integrated with the tripping devices 41b, 42b, 43b, 44b, respectively.
The fixed contact 21 and the movable contact 22 of each pole constitute first switching contacts 41a, 42a, 43a, 44a that first open and close the electric circuit when a large current is interrupted.

クロスバー３２がその軸心を中心として回動したときに、各極４１〜４４の各可動接触子２３が同時に回動され、この可動接触子２３の回動により、可動接点２２が固定接点２１に接触および開離する。
また、開閉機構３０は、周知のトグルリンク機構からなり、引外し装置４１ｂ、４２ｂ、４３ｂ、４４ｂにより駆動される周知のトリップバー３３を備えている。When the cross bar 32 rotates about its axis, the movable contacts 23 of the poles 41 to 44 are simultaneously rotated. By the rotation of the movable contact 23, the movable contact 22 is fixed to the fixed contact 21. Touch and release.
The opening / closing mechanism 30 includes a known toggle link mechanism, and includes a known trip bar 33 driven by tripping devices 41b, 42b, 43b, and 44b.

さらに、回路遮断器１０２は、図７に示すように、開閉機構３０の両側に設けられ、クロスバー３２の回動によりそれぞれ駆動されるアクチュエータ２８ａ、２８ｂと、同じく開閉機構３０の両側に設けられ、アクチュエータ２８ａ、２８ｂにより駆動され接点が開閉する第二の開閉接点４６ａ、４６ｂと、を有している。
第二の開閉接点４６ａ、４６ｂは、アクチュエータ２８ａ、２８ｂによりボタン４６１を押下されると、第二の開閉接点４６ａ、４６ｂの開閉接点が接触するものである。Further, as shown in FIG. 7, the circuit breaker 102 is provided on both sides of the opening / closing mechanism 30, and is provided on both sides of the opening / closing mechanism 30, as well as the actuators 28 a and 28 b respectively driven by the rotation of the crossbar 32. And second open / close contacts 46a and 46b that are driven by actuators 28a and 28b to open and close the contacts.
The second switching contacts 46a and 46b are the contacts of the switching contacts of the second switching contacts 46a and 46b when the button 461 is pressed by the actuators 28a and 28b.

次に回路遮断器１０２の動作について説明する。
まず、投入動作について説明する。
図８に示すように、操作ハンドル３１を投入すると開閉機構３０のトグルリンクがデッドポイントを超えることで、クロスバー３２が、図８（ａ）の状態から図８（ｂ）の状態ので図８の紙面上、反時計方向に回動を始める。このクロスバー３２の回動により、アクチュエータ２８ａ、２８ｂも図８の紙面上、反時計方向に回動し、図８（ｂ）に示すように、アクチュエータ２８ａ、２８ｂによりボタン４６１が押下される。このボタン４６１の押下により第二の開閉接点４６ａ、４６ｂが接触状態となる。Next, the operation of the circuit breaker 102 will be described.
First, the making operation will be described.
As shown in FIG. 8, when the operation handle 31 is inserted, the toggle link of the opening / closing mechanism 30 exceeds the dead point, so that the crossbar 32 changes from the state of FIG. 8 (a) to the state of FIG. 8 (b). Starts to rotate counterclockwise on the paper. By the rotation of the cross bar 32, the actuators 28a and 28b are also rotated counterclockwise on the paper surface of FIG. 8, and the button 461 is pressed by the actuators 28a and 28b as shown in FIG. 8B. By pressing the button 461, the second switching contacts 46a and 46b are brought into contact.

さらに、クロスバー３２が回動すると、図８（ｃ）に示すように、第一の開閉接点４１ａ、４２ａ、４３ａ、４４ａを構成する可動接点２２が固定接点２１にそれぞれ接触するる。これにより直流電路２００の電圧がゲート駆動回路６に印可され、所定の遅延時間を経て半導体スイッチ４５ａ、４５ｂがＯＮとなる。この半導体スイッチ４５ａ、４５ｂのＯＮ状態が保持されるが、第二の開閉接点４６ａ、４６ｂの接触抵抗の方が、半導体スイッチ４５ａ、４５ｂのＯＮ抵抗より小さいので、電流は主として第二の開閉接点４６ａ、４６ｂを流れるため、半導体スイッチ４５ａ、４５ｂの発熱は抑制される。   Further, when the cross bar 32 rotates, the movable contacts 22 constituting the first open / close contacts 41a, 42a, 43a, 44a come into contact with the fixed contacts 21 as shown in FIG. 8C. As a result, the voltage of the DC circuit 200 is applied to the gate drive circuit 6, and the semiconductor switches 45a and 45b are turned on after a predetermined delay time. Although the ON state of the semiconductor switches 45a and 45b is maintained, the contact resistance of the second switching contacts 46a and 46b is smaller than the ON resistance of the semiconductor switches 45a and 45b, so that the current is mainly the second switching contact. Since it flows through 46a and 46b, the heat generation of the semiconductor switches 45a and 45b is suppressed.

次に、遮断動作について説明する。
短絡電流や過電流が流れると引外し装置４１ｂ、４２ｂ、４３ｂ、４４ｂが、トリップバー３３を押し開閉機構３０が駆動されることにより、クロスバー３２が回動を開始する。クロスバー３２の回動により、可動接点２２が固定接点２１から開離する。これにより、第一の開閉接点４１ａ、４２ａ、４３ａ、４４ａがまず開離する。可動接点２２が開離した際、この開離距離に対して十分な直流高電圧であることから、アーク電流は固定接点２１と可動接点間２２の最短距離で維持しようとする。今回、第一の開閉接点の目的は、消弧装置５０のみでは遮断できない電圧であることもあり、大電流遮断時の遮断電流の限流となる。その第一の開閉接点はクロスバー３２が回動始めると同時に開離し最大開離直前までに電流を半導体スイッチ４５ａ、４５ｂの定格電流以下に抑えるように消弧装置５０が構成されている。Next, the blocking operation will be described.
When a short circuit current or an overcurrent flows, the tripping devices 41b, 42b, 43b, 44b push the trip bar 33 and the opening / closing mechanism 30 is driven, whereby the cross bar 32 starts to rotate. The movable contact 22 is separated from the fixed contact 21 by the rotation of the cross bar 32. Thereby, the first switching contacts 41a, 42a, 43a, 44a are first opened. When the movable contact 22 is separated, since the DC high voltage is sufficient with respect to this separation distance, the arc current tries to be maintained at the shortest distance between the fixed contact 21 and the movable contact 22. This time, the purpose of the first switching contact may be a voltage that cannot be interrupted only by the arc-extinguishing device 50, which is a current limiting current for interrupting a large current. The first switching contact is opened at the same time as the crossbar 32 starts to rotate, and the arc extinguishing device 50 is configured so that the current is kept below the rated current of the semiconductor switches 45a and 45b immediately before the maximum opening.

その後、クロスバー３２が最大開離の直前に第二の開閉接点４６ａ、４６ｂが開離し、これにより限流された電流は半導体スイッチ４５ａ、４５ｂに転流される。その時、第一の開閉接点４１ａ、４２ａ、４３ａ、４４ａ間でも限流している状態でもあり、電圧降下も大きい、これにより、半導体スイッチ４５ａ、４５ｂを駆動しているゲート駆動回路６への供給電圧が低下する。この供給電圧の低下によりゲート駆動回路６への給電が停止するが、ゲート駆動回路６の時延回路により、所定の時間（例えば、１５ｍｓｅｃ）、半導体スイッチ４５ａ、４５ｂのゲート電圧が確保される。そして、所定の時間が経過した後、通電電流が定格電流以下となったところで半導体スイッチ４５ａ、４５ｂのゲートがＯＦＦされ、遮断動作を完了させる。   Thereafter, the second switching contacts 46a and 46b are opened immediately before the crossbar 32 is fully opened, and the current limited thereby is commutated to the semiconductor switches 45a and 45b. At that time, the current is also limited between the first switching contacts 41a, 42a, 43a, 44a, and the voltage drop is large, whereby the supply voltage to the gate drive circuit 6 that drives the semiconductor switches 45a, 45b. Decreases. Although the power supply to the gate drive circuit 6 is stopped due to the drop in the supply voltage, the gate voltage of the semiconductor switches 45a and 45b is secured by a time delay circuit of the gate drive circuit 6 for a predetermined time (for example, 15 msec). Then, after a predetermined time has passed, the gates of the semiconductor switches 45a and 45b are turned off when the energization current becomes equal to or lower than the rated current, and the cutoff operation is completed.

本実施の形態によれば、直流電路２００を開閉する第一の開閉接点４１ａ、４２ａ、４３ａ、４４ａと、この第一の開閉接点４１ａ、４２ａ、４３ａ、４４ａと直列に接続された半導体スイッチ４５ａ、４５ｂと、半導体スイッチ４５ａ、４５ｂの両端に並列接続された第二の開閉接点４６ａ、４６ｂと、を設け、半導体スイッチ４５ａ、４５ｂは、投入時には第一の開閉接点４１ａ、４２ａ、４３ａ、４４ａおよび第二の開閉接点４６ａ、４６ｂの閉成後に閉成され、遮断時には第一の開閉接点４１ａ、４２ａ、４３ａ、４４ａおよび第二の開閉接点４６ａ、４６ｂの開成後に開成されるので、小電流から地絡電流までの直流電流を安定して遮断することができる。   According to the present embodiment, the first switching contacts 41a, 42a, 43a, 44a that open and close the DC circuit 200, and the semiconductor switch 45a connected in series with the first switching contacts 41a, 42a, 43a, 44a. , 45b and second switching contacts 46a, 46b connected in parallel to both ends of the semiconductor switches 45a, 45b. When the semiconductor switches 45a, 45b are turned on, the first switching contacts 41a, 42a, 43a, 44a are provided. And the second switching contacts 46a, 46b are closed, and at the time of interruption, the first switching contacts 41a, 42a, 43a, 44a and the second switching contacts 46a, 46b are opened. DC current from the ground fault current to the ground fault current can be stably interrupted.

また、第一の開閉接点として、各固定接点２１と、この固定接点２１と接触および開離する各可動接点２２とを４極分、つまり４式設けたので、２式の場合より高電圧の直流回路を遮断することができる。   Further, as the first switching contact, each fixed contact 21 and each movable contact 22 that contacts and separates from this fixed contact 21 are provided for four poles, that is, four sets, so that a higher voltage than in the case of two sets is provided. The DC circuit can be shut off.

１ａ 第一の開閉接点、１ｂ 第一の開閉接点、
２ａ 第二の開閉接点、２ｂ 第二の開閉接点、３ 開閉機構、
４ａ 半導体スイッ、４ｂ 半導体スイッチ、５ａ 引外し装置、５ｂ 引外し装置、
１００ 回路遮断器。1a first switching contact, 1b first switching contact,
2a second switching contact, 2b second switching contact, 3 switching mechanism,
4a semiconductor switch, 4b semiconductor switch, 5a trip device, 5b trip device,
100 Circuit breaker.

Claims (5)

電路を開閉する第一の開閉接点と、この第一の開閉接点に直列に接続され、前記電路を開閉する第二の開閉接点と、前記第二の開閉接点の両端に並列に接続され、前記電路を開閉する半導体スイッチと、前記第一の開閉接点より早く前記第二の開閉接点を閉成し、前記第一の開閉接点より遅く前記第二の開閉接点を開成する開閉機構と、を備え、
前記半導体スイッチは、投入時には前記第一の開閉接点および前記第二の開閉接点の閉成後に閉成され、遮断時には前記第一の開閉接点および前記第二の開閉接点の開成後に開成されることを特徴とする回路遮断器。 A first switching contact that opens and closes the electrical circuit, and is connected in series to the first switching contact, a second switching contact that opens and closes the electrical circuit, and is connected in parallel to both ends of the second switching contact, A semiconductor switch that opens and closes an electric circuit; and an opening / closing mechanism that closes the second opening / closing contact earlier than the first opening / closing contact and opens the second opening / closing contact later than the first opening / closing contact. ,
The semiconductor switch is closed after the first switching contact and the second switching contact are closed when being turned on, and is opened after the first switching contact and the second switching contact are opened when being shut off. Circuit breaker characterized by. ４極の回路遮断器において、前記第一の開閉接点は一端に前記電路もしくは負荷のいずれかが接続された２極に設けられており、前記第二の開閉接点は一端に前記２極の他端および前記半導体スイッチの一端がそれぞれ接続され、他端に前記半導体スイッチの他端がそれぞれ接続された他の２極に設けられていることを特徴とする請求項１記載の回路遮断器。 In the four-pole circuit breaker, the first switching contact is provided at two poles connected to one end of the electric circuit or the load, and the second switching contact is connected to the other end of the two poles at one end. end and one end of the semiconductor switches are respectively connected, the circuit breaker according to claim 1 Symbol mounting and the other end of the semiconductor switch is provided on the other two poles connected to the other end. 前記第一の開閉接点の開離距離は、前記第二の開閉接点の開離距離より大きいことを特徴とする請求項２に記載の回路遮断器。 The circuit breaker according to claim 2 , wherein a separation distance of the first switching contact is larger than a separation distance of the second switching contact. ４極の回路遮断器において、前記第一の開閉接点は、一端に前記電路の正極および負極がそれぞれ接続された２極と、一端に負荷の正極および負極がそれぞれ接続された他の２極とに設けられており、
前記半導体スイッチは、前記２極の他端間、および前記他の２極の他端間にそれぞれ接続されており、
前記第二の開閉接点は、前記開閉機構の極の配列方向における前記開閉機構の両側にそれぞれ設けられ、前記半導体スイッチの両端間にそれぞれ並列接続されていることを特徴とする請求項１に記載の回路遮断器。 In the four-pole circuit breaker, the first switching contact includes two poles connected to one end of the positive and negative electrodes of the electric circuit at one end and the other two poles connected to one end of the positive and negative electrodes of the load, respectively. It is provided in
The semiconductor switch is connected between the other end of the two poles and between the other end of the other two poles,
The second switching contact are respectively provided on both sides of the opening and closing mechanism in the arrangement direction of the poles of the switching mechanism, according to claim 1, characterized in that said connected in parallel respectively across the semiconductor switch Circuit breaker. 前記開閉機構に駆動され、前記第二の開閉接点を開閉するアクチュエータを備えたことを特徴とする請求項４に記載の回路遮断器。 The circuit breaker according to claim 4 , further comprising an actuator that is driven by the opening / closing mechanism and opens / closes the second switching contact.
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