JP2011175925A - DC circuit breaker - Google Patents

Abstract

An object of the present invention is to obtain a DC circuit breaker with a small number of objects to be controlled in order to prevent inability to shut off due to poor control.
A DC circuit breaker according to the present invention includes a main circuit breaker 1 that is closed when the system is normal, and a sub circuit breaker 7 that is connected in parallel with the main circuit breaker 1 and is open when the system is normal. The commutation capacitor 4 installed in series with the secondary circuit breaker 7, the main operation mechanism 8 connected to the main circuit breaker 1 for operating the opening and closing of the electrodes of the main circuit breaker 1, and the sub circuit breaker 7 The main circuit breaker 1 and / or the sub circuit breaker 7 are opened to the sub operation mechanism 9 connected and operated to open and close the electrodes of the sub circuit breaker 7, the main operation mechanism 8 and the sub operation mechanism 9. And a control device that outputs the closing command for closing the main circuit breaker 1 and / or the sub circuit breaker 7, and the sub circuit breaker 7 is closed after the main circuit breaker 1 is opened. It is characterized by doing.
[Selection] Figure 1

Description

  The present invention relates to a DC circuit breaker used for a DC circuit or the like.

In a DC circuit such as a power circuit for an electric railway, a DC circuit breaker that cuts off an accident current or an energized current is provided on the power source side of the DC power supply. (See Patent Document 1)
FIG. 11 shows a configuration diagram of a conventional DC circuit breaker. The main circuit breaker 1 is installed on the power transmission line 20 that connects the DC power supply 18 and the load 19, and the sub circuit breaker 7 is installed in parallel with the main circuit breaker 1. In parallel with the main circuit breaker and in series with the sub circuit breaker 7, the energy absorbing element 2 and the commutation circuit 21 are connected in parallel. In the commutation circuit 21, a commutation capacitor 4, a reactor 3, and a commutation switch 5 are connected in series. At this time, the auxiliary circuit breaker 7 is installed on the load side from the commutation circuit 21 and the energy absorbing element 2. The commutation capacitor 4 is charged to a predetermined voltage by a charging device (not shown), and the commutation switch 5 is controlled to be turned on and off by the commutation operation mechanism 6.

  When interrupting the current flowing through the power transmission line 20, the main circuit breaker 1 is opened, the commutation switch 5 is closed and the commutation capacitor 4 is discharged, and the commutation current in the direction opposite to the current flowing through the main circuit breaker 1. Is cut off by setting the current flowing through the main circuit breaker 1 to zero. When the current flowing through the main circuit breaker 1 becomes zero, a current flows through the energy absorption elements 2 connected in parallel, and the current attenuates. The secondary circuit breaker 7 opens after closing the commutation switch 5, and when the current flowing from the power source side to the load side attenuates to zero, the circuit breaker is completed.

Japanese Patent No. 3965037

  In a conventional DC circuit breaker, if a sub-breaker 7 opens before closing the commutation switch 5 due to a control failure when the circuit breaks, a commutation current is supplied from the commutation capacitor 4 to the main circuit breaker 1. However, there is a problem that current interruption is impossible.

  The present invention solves the above-described problem, and does not use the commutation switch 5 in order to prevent the inability to shut off due to the opening of the auxiliary circuit breaker 7 before closing the commutation switch 5 due to poor control. An object of the present invention is to obtain a DC circuit breaker with a small number of objects to be controlled by energizing a commutation current with the auxiliary circuit breaker 7.

  The DC breaker of the present invention is a main circuit breaker that is installed in a power transmission line and is closed when the system is normal, a sub-breaker that is connected in parallel with the main circuit breaker and is open when the system is normal, A commutation capacitor installed in series with the secondary circuit breaker, electrode position detecting means for measuring a distance between the electrodes of the main circuit breaker, and an electrode of the main circuit breaker, which opens and closes the electrode of the main circuit breaker A main operation mechanism that provides a driving force to be applied, a sub operation mechanism that is connected to an electrode of the sub circuit breaker and provides a driving force to open and close the electrode of the sub circuit breaker, the main operation mechanism, and the sub operation mechanism, An opening command for opening the main circuit breaker or the sub circuit breaker, and a control device for outputting the closing command for closing the main circuit breaker or the sub circuit breaker, the control device comprising: When an accident occurs, an opening command is output to the main operating mechanism, and the main blocking mechanism is output. And when the electrode position detecting means detects that the distance between the electrodes of the main circuit breaker is a preset distance, a closing command is output to the sub-operation mechanism, By closing the circuit breaker, a commutation current stored in the commutation capacitor is supplied to the main circuit breaker.

  According to the present invention, in order to prevent inability to shut off due to the opening of the secondary circuit breaker before closing the commutation switch, the commutation current is energized by the secondary circuit breaker without using the commutation switch. A DC circuit breaker with few control objects can be obtained.

The circuit block diagram in Embodiment 1 of this invention. The figure which shows the timing of the opening and closing of a main circuit breaker and a sub circuit breaker in Embodiment 1 of this invention. The circuit block diagram in Embodiment 2 of this invention. The figure which shows the structure and operation | movement in Embodiment 2 of this invention. The circuit block diagram in Embodiment 3 of this invention. The block diagram in Embodiment 3 of this invention. The circuit block diagram in Embodiment 4 of this invention. The figure which shows the structure and operation | movement in Embodiment 4 of this invention. The figure which shows the timing of the opening and closing of a main circuit breaker and a sub circuit breaker in Embodiment 4 of this invention. The block diagram in Embodiment 5 of this invention. The block diagram of the conventional DC circuit breaker.

  Hereinafter, embodiments of a DC circuit breaker according to the present invention will be described with reference to the drawings.

(Embodiment 1)
A circuit configuration diagram of Embodiment 1 of the present invention is shown in FIG. The DC circuit breaker according to Embodiment 1 of the present invention includes a main circuit breaker 1, an energy absorbing element 2, a reactor 3, a commutation capacitor 4, a sub circuit breaker 7, a main operation mechanism 8, and a sub operation mechanism 9. And. The main circuit breaker 1 is installed on a power transmission line 20 that connects a DC power source 18 and a load 19. The energy absorbing element 2 and the sub circuit breaker 7 are connected to the power transmission line 20 in parallel. A commutation capacitor 4 and a reactor 3 are connected in series to the auxiliary circuit breaker 7.

  Each of the main circuit breaker 1 and the sub circuit breaker 7 is operated by the main operation mechanism 8 and the sub operation mechanism 9. The main operation mechanism 8 and the sub operation mechanism 9 operate in response to an opening / closing command from the control device 10. The main circuit breaker 1 is provided with electrode position detecting means 1a for detecting the distance between the electrodes of the main circuit breaker 1.

  The operation of the first embodiment configured as described above will be described with reference to FIG. FIG. 2 shows the opening / closing timings of the main circuit breaker 1 and the sub circuit breaker 7. When the system is normal when no accident is detected, the main circuit breaker 1 is closed and the sub circuit breaker 7 is opened. When the current I flowing through the power transmission line 20 is interrupted due to the occurrence of a power transmission line accident, first, when the control device 10 outputs a contact opening command to the main operation mechanism 8 (T1), the control device 10 outputs it. The main operation mechanism 8 that has received the opened opening command opens the main breaker 1. When it is determined by the electrode position detection means 1a that the distance between the electrodes of the main circuit breaker 1 has become a preset distance so that dielectric breakdown does not occur again due to the voltage between the electrodes after interruption (T2), The opening completion information is output from the detection means 1a to the control device 10. When the opening completion information is input to the control device 10, the control device 10 outputs a closing command to the sub operation mechanism 9 (T 3), and the sub operation mechanism 9 that receives this closing command closes the sub circuit breaker 7. .

  By closing the sub circuit breaker 7, the commutation capacitor 4 is discharged, and a commutation current in a direction opposite to the current flowing through the main circuit breaker 1 is supplied to the main circuit breaker 1. The current flowing through the main circuit breaker 1 is set to 0 by this commutation current. When the current flowing through the main circuit breaker 1 becomes 0, the current flows through the energy absorbing elements 2 connected in parallel, and thus the current is attenuated. After detecting that the current has attenuated by a current transformer (CT) that measures the current flowing through the energy absorbing element 2, the sub-operation mechanism 9 receives the sub-opening command output from the control device 10, and The auxiliary circuit breaker 7 is opened to complete the interruption.

  According to the first embodiment, since the commutation current is energized by the sub-breaker 7 without using the commutation switch, the control circuit 10 is simplified, and the control circuit is simplified. A malfunction in which the commutation switch is closed before the sub circuit breaker 7 is closed can be prevented.

(Embodiment 2)
A second embodiment of the present invention will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 3 shows a circuit configuration diagram of the second embodiment. The second embodiment is different from the first embodiment in that a driving force transmission mechanism 22 is provided, and the driving force of the main operation mechanism 8 is transmitted to the sub circuit breaker 7 via the driving force transmission mechanism 22. The driving force of the main operation mechanism 8 transmitted through the driving force transmission mechanism 22 is transmitted to the electrode on which the sub operation mechanism 9 is installed.

  Furthermore, the configuration of the second embodiment will be described with reference to FIG. The driving force transmission mechanism 22 includes a main operation rod 13 that transmits the driving force of the main operation mechanism 8 to the main circuit breaker 1, a sub operation rod 14 that transmits the driving force of the sub operation mechanism 9 to the sub circuit breaker 7, and the link mechanism 11. The link mechanism 11 and the spring 12 transmit the driving force of the main operation rod 13 to the sub operation rod 14.

  The operation of the second embodiment configured as described above will be described. FIG. 4A shows a normal state where no accident is detected. The main circuit breaker 1 is closed and the sub circuit breaker 7 is opened. When an accident is detected, an opening command is output from the control device 10 to the main operation mechanism 8. The main operation mechanism 8 receives the opening command and opens the main circuit breaker 1 via the main operation rod 13. At the same time, the link mechanism 11 connected to the main operation rod 13 is connected to the sub operation rod 14. By transmitting the driving force to close the secondary circuit breaker 7, the secondary circuit breaker 7 is closed, and the state shown in FIG.

  After the sub circuit breaker 7 is closed, when the commutation capacitor 4 causes the commutation current to flow through the main circuit breaker 1, the current flows through the energy absorption element 2 when the current flowing through the main circuit breaker 1 becomes zero. The current decays. After this current decay is detected by a current transformer (CT) that detects the current flowing through the energy absorbing element 2, the sub-operation mechanism 9 receives the opening command and the sub-interrupt via the sub-operation rod 14. By opening the device 7, the current interruption is completed, and the state shown in FIG. At this time, the link mechanism 11 does not operate, and the spring 12 extends so that only the auxiliary circuit breaker 7 can be operated without transmitting the driving force to the main circuit breaker 1.

  According to the second embodiment, in addition to the effect of the first embodiment, since the opening of the main circuit breaker 1 and the closing of the sub circuit breaker 7 are mechanically linked, the sub circuit breaker is opened when the main circuit breaker 1 is opened. Control for closing the device 7 is facilitated.

  Although the spring 12 is used in the second embodiment, the link mechanism 11 is directly connected to the sub operation rod 14 without using the spring 12, and a connection release mechanism for releasing this connection is provided to open the sub circuit breaker 7. The same effect can be obtained even if the connection release mechanism is operated at the same time.

(Embodiment 3)
A third embodiment of the present invention will be described with reference to FIGS. The same components as those in the second embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 5 shows a circuit configuration diagram of the third embodiment. The third embodiment is different from the second embodiment in that the driving force transmission mechanism 22 that transmits the driving force of the main operation mechanism 8 to the sub circuit breaker 7 is connected to the electrode paired with the electrode to which the sub operation mechanism 9 is connected. It is a point that has been.

  Further, the configuration of the third embodiment will be described with reference to FIG. The driving force transmission mechanism 22 includes a link mechanism 11, a main operation rod 13 that transmits the driving force of the main operation mechanism 8 to the main circuit breaker 1, and a sub operation rod 14 that transmits the driving force of the sub operation mechanism 9 to the sub operation mechanism. The link mechanism 11 transmits the driving force of the main operation rod 13 to the sub operation rod 14.

  The operation of the third embodiment configured as described above will be described. When no accident is detected, the main circuit breaker 1 is closed and the sub circuit breaker 7 is opened. When an accident is detected, an opening command is output from the control device 10 to the main operation mechanism 8. The main operation mechanism 8 receives the opening command and opens the main circuit breaker 1 via the main operation rod 13. At the same time, the link mechanism 11 connected to the main operation rod 13 is connected to the sub operation rod 14. The auxiliary circuit breaker 7 is closed by transmitting the driving force for closing the.

  After the sub circuit breaker 7 is closed, when the commutation capacitor 4 causes the commutation current to flow through the main circuit breaker 1, the current flows through the energy absorption element 2 when the current flowing through the main circuit breaker 1 becomes zero. The current decays. After this current decay is detected by a current transformer (CT) that detects the current flowing through the energy absorption element 2, the sub-operation mechanism 9 receives the opening command output from the control device 10, and receives the sub-operation. Breaking is completed by opening the electrode of the secondary circuit breaker 7 which is paired with the electrode on which the rod 14 is installed.

  According to the third embodiment, in addition to being able to obtain the same effect as that of the second embodiment, it is not necessary to provide a connection release mechanism for releasing the connection between the spring and the link mechanism and the sub operation mechanism. It can be simplified.

(Embodiment 4)
A fourth embodiment of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the structure same as Embodiment 2, and description is abbreviate | omitted.

  FIG. 7 shows a circuit configuration diagram of the fourth embodiment. The fourth embodiment is different from the second embodiment in that the auxiliary operation mechanism 9 is eliminated and the electrode movable range of the main circuit breaker 1 is increased.

  Further, the configuration of the fourth embodiment will be described with reference to FIG. The driving force transmission mechanism 22 includes a spring 12, a main operation rod 13, and a sub operation rod 14. The driving force of the main operation mechanism 8 is transmitted to the main circuit breaker 1 through the main operation rod 13, and the sub operation rod. 14 and the spring 12 are transmitted to the auxiliary circuit breaker 7.

  The operation of the fourth embodiment configured as described above will be described with reference to FIGS. FIG. 9 shows the opening / closing timings of the main circuit breaker 1 and the sub circuit breaker 7 according to the fourth embodiment. FIG. 8A and FIG. 9A show a normal time when no accident is detected. The main circuit breaker 1 is closed and the sub circuit breaker 7 is opened. At this time, the spring 12 is extended. When an accident is detected, an opening command is output from the control device 10 to the main operation mechanism 8. When the main operation mechanism 8 receives the opening command and opens the main circuit breaker 1 via the main operation rod 13, the sub circuit breaker 7 is closed simultaneously. When the operation is completed, the state shown in FIGS. 5b and 6b is obtained. Thereafter, the spring 12 has a basic length without expansion / contraction.

  After the sub circuit breaker 7 is closed, when the commutation capacitor 4 causes the commutation current to flow through the main circuit breaker 1, the current flows through the energy absorption element 2 when the current flowing through the main circuit breaker 1 becomes zero. The current decays. After this current decay is detected by a current transformer (CT) that detects the current flowing through the energy absorbing element 2, the main operation mechanism 8 receives the opening command output from the control device 10, and receives the main operation. By opening only the auxiliary circuit breaker 7 through the rod 13, the current interruption is completed, and the states shown in FIGS. 8C and 9C are obtained.

  According to the fourth embodiment, in addition to the effects of the second embodiment, by using one operation mechanism, the structure and control can be simplified, and at the same time, the mechanical reliability is improved.

(Embodiment 5)
The configuration of the fifth embodiment of the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the structure same as Embodiment 2, and description is abbreviate | omitted.

  FIG. 10 shows a configuration diagram of the fifth embodiment. Differences from the second embodiment will be described below. The main circuit breaker 1 is connected via a main operation rod 13, a spring 12, and a sub operation rod 14, and a high speed opening mechanism 15 using an electromagnetic repulsive force is attached to the main operation rod 13. The main operation mechanism 8 is connected to the main operation rod 13 via the second spring 16. The sub operation mechanism 9 is connected to the sub operation rod 14 via the third spring 17. The driving force transmission mechanism 22 includes a spring 12, a main operation rod 13, a sub operation rod 14, a high-speed opening mechanism 15, a second spring 16, and a third spring 17.

  The operation of the fifth embodiment configured as described above will be described. When no accident is detected, the main circuit breaker 1 is closed and the sub circuit breaker is open. When an accident is detected, an opening command is input from the control device 10 to the high-speed opening mechanism 15 and the main operation mechanism 8. The main circuit breaker 1 is opened by the high-speed opening mechanism 15 that operates quickly. The operating rod 13 is moved to the auxiliary circuit breaker 7 side by the high-speed opening mechanism 15, and the spring 12, the second spring 16, and the third spring 17 are pushed to the auxiliary circuit breaker 7 side.

  The sub circuit breaker 7 is closed, and the commutation current is supplied to the main circuit breaker 1. Since the main operating rod 13 and the main operating mechanism 8 are connected via the second spring 16, the main operating mechanism 8 operates slowly through the second spring 16 even when the opening operation is not started. Since it is connected, only the second spring 16 is compressed and the movement of the main operating rod 13 toward the sub breaker 7 is not stopped. When the commutation current flows through the main circuit breaker 1 and the current flowing through the main circuit breaker 1 becomes zero, the current flows through the energy absorption element 2, thereby attenuating the current. After this current decay is detected by a current transformer (CT) that detects the current flowing through the energy absorption element 2, the sub-operation mechanism 9 receives the opening command output from the control device 10, and receives the sub-operation. The electrode of the secondary circuit breaker 7 paired with the electrode on which the rod 14 is installed is opened.

  According to the fifth embodiment, in addition to the effects of the second embodiment, the high-speed opening mechanism 15 can be used, so that high-speed interruption after the occurrence of an accident is possible.

  When interrupting the normal load current, the main operating mechanism 8 and the sub operating mechanism 9 may be operated without operating the high speed opening mechanism 15. By performing such an operation, the mechanical life of the high-speed opening mechanism 15 can be extended.

  In Embodiments 1 to 5 described above, it is described that the secondary circuit breaker 7 is opened after detecting that the current flowing through the energy absorbing element 2 is attenuated by CT. However, the current decay time is measured in advance. The auxiliary circuit breaker 7 may be opened after the attenuation is confirmed by the timer.

  Moreover, although the sub circuit breaker 7 is installed in parallel with the main circuit breaker 1 and on the load 19 side, the same effect can be obtained even if it is installed in parallel with the main circuit breaker 1 and on the DC power supply 18 side.

  Furthermore, after the current supplied to the transmission line 20 is interrupted by the DC circuit breaker of the present invention, when the reclosing is performed, a closing signal is output from the control device 10 to the main operation mechanism 8 and the closing signal is received. The main operation mechanism 8 closes the main circuit breaker 1 so that it can be energized again.

DESCRIPTION OF SYMBOLS 1 ... Main circuit breaker 1a ... Electrode position detection means 2 ... Energy absorption element 3 ... Reactor 4 ... Commutation capacitor 7 ... Sub circuit breaker 8 ... Main operation mechanism 9 ... Sub operation mechanism 10 ... Control apparatus 11 ... Link mechanism 12 ... Spring DESCRIPTION OF SYMBOLS 13 ... Main operating rod 14 ... Sub operating rod 15 ... High speed opening mechanism 16 ... 2nd spring 17 ... 3rd spring 18 ... DC power supply 19 ... Load 20 ... Power transmission line 21 ... Commutation circuit 22 ... Driving force transmission mechanism

Claims (8)

A main circuit breaker installed in the transmission line and closed when the system is normal;
A secondary circuit breaker connected in parallel with the main circuit breaker and opened when the system is normal,
A commutation capacitor installed in series with the sub-breaker;
An electrode position detecting means for measuring a distance between the electrodes of the main circuit breaker;
A main operating mechanism that is connected to the electrode of the main circuit breaker and provides a driving force for opening and closing the electrode of the main circuit breaker;
A sub operation mechanism that is connected to the electrode of the sub circuit breaker and applies a driving force to open and close the electrode of the sub circuit breaker;
A controller that outputs, to the main operation mechanism and the sub operation mechanism, an opening command for opening the main circuit breaker or the sub circuit breaker and a closing command for closing the main circuit breaker or the sub circuit breaker; With
The control device outputs a contact opening command to the main operation mechanism when an accident occurs in the power transmission line, the main circuit breaker is opened, and the distance between the electrodes of the main circuit breaker is determined in advance by the electrode position detecting means. After it is detected that the set distance has been reached, a closing command is output to the sub-operation mechanism, and the sub-breaker is closed, whereby the commutation current stored in the commutation capacitor is DC circuit breaker characterized by energizing the breaker. A main circuit breaker installed in the power system and closed when the system is normal;
A secondary circuit breaker connected in parallel with the main circuit breaker and opened when the system is normal,
A commutation capacitor installed in series with the sub-breaker;
A main operating rod connected to the electrode of the main circuit breaker;
A sub operation rod connected to the electrode of the sub circuit breaker;
A main operating mechanism that is connected to the main circuit breaker via the main operating rod, and that provides a driving force to open and close the electrodes of the main circuit breaker;
A sub operation mechanism that is connected to the sub circuit breaker via the sub operation rod, and that provides a driving force for opening and closing the electrode of the sub circuit breaker;
A link mechanism for connecting the main operation rod and the sub operation rod;
The driving force during the opening operation of the main circuit breaker is transmitted to the sub operation rod as a driving force for closing the sub circuit breaker via the link mechanism, and the commutation is performed by closing the sub circuit breaker. A DC circuit breaker characterized in that a commutation current stored in a capacitor is passed through the main circuit breaker. The link mechanism includes an elastic body;
3. The direct current according to claim 2, wherein when the elastic body expands and contracts, the sub operating mechanism does not give a driving force for opening the sub circuit breaker as a driving force for closing the main circuit breaker. Circuit breaker. A connection release mechanism for releasing the connection between the link mechanism and the main operation rod or the sub operation rod;
The said connection release mechanism operate | moves, The driving force which the said sub operation mechanism opens the said secondary circuit breaker is not given as a driving force which closes the said main circuit breaker, The said Claim 2 characterized by the above-mentioned. DC circuit breaker. A main circuit breaker installed in the power system and closed when the system is normal;
A secondary circuit breaker connected in parallel with the main circuit breaker and opened when the system is normal,
A commutation capacitor installed in series with the sub-breaker;
A main operating rod connected to the electrode of the main circuit breaker;
A sub operation rod connected to the electrode of the sub circuit breaker;
A main operating mechanism that is connected to the main circuit breaker via the main operating rod, and that provides a driving force to open and close the electrodes of the main circuit breaker;
A sub-operation mechanism that is connected to an electrode facing the electrode to which the sub-operation rod of the sub-breaker is connected, and that provides a driving force for opening and closing the electrode of the sub-breaker;
A link mechanism for connecting the main operation rod and the sub operation rod;
The driving force during the opening operation of the main circuit breaker is transmitted to the sub operation rod as a driving force for closing the sub circuit breaker via the link mechanism, and the commutation is performed by closing the sub circuit breaker. A DC circuit breaker characterized in that a commutation current stored in a capacitor is passed through the main circuit breaker. A main circuit breaker installed in the power system and closed when the system is normal;
A secondary circuit breaker connected in parallel with the main circuit breaker and opened when the system is normal,
A commutation capacitor installed in series with the sub-breaker;
A main operation mechanism for providing a driving force for opening and closing the electrodes of the main circuit breaker and the sub circuit breaker;
A main operating rod that transmits the driving force of the main operating mechanism to the main circuit breaker and the sub circuit breaker;
The driving force during the opening operation of the main circuit breaker is transmitted as a driving force for closing the sub circuit breaker via the main operating rod, and is stored in the commutation capacitor by closing the sub circuit breaker. A DC circuit breaker characterized in that a commutation current is passed through the main circuit breaker. The main operating rod has a high-speed opening mechanism;
The DC breaker according to any one of claims 1 to 6, wherein the high-speed opening mechanism operates during the opening operation of the main circuit breaker. A main circuit breaker installed in the transmission line and closed when the system is normal;
A secondary circuit breaker connected in parallel with the main circuit breaker and opened when the system is normal,
A commutation capacitor installed in series with the sub-breaker;
A main operating rod connected to the electrode of the main circuit breaker;
A sub operation rod having one end connected to the electrode of the sub circuit breaker and the other end connected via a main operation rod;
A high-speed opening mechanism that is installed on the main operating rod and opens the main circuit breaker;
A main operation mechanism that is connected to the main operation rod and operates to open and close the main circuit breaker;
A sub operation mechanism connected to the sub operation rod and operating to open and close the sub circuit breaker;
The driving force during the opening operation of the main circuit breaker is transmitted through the main operation rod, the first elastic body and the sub operation rod, and is transmitted as the driving force for closing the sub circuit breaker, A DC circuit breaker characterized in that a commutation current stored in the commutation capacitor is supplied to the main circuit breaker by closing the sub circuit breaker.

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