JP2009181908A - Dc high-speed vacuum circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact, inexpensive DC high-speed vacuum circuit breaker. <P>SOLUTION: A vacuum valve 4 is connected between a DC power source 14 and a load 15, one end of a second series circuit S2 composed of a capacitor 1, a commutation switch 2 and an inductance element 3 is connected with a connection point between the DC power source 14 and the vacuum valve 4. A first switch 7 having no DC current breaking capability is connected between the other end of the second series circuit S2 and a connection point of the vacuum valve 4 and the load 15, and is connected with the second series circuit S2 in parallel. A discharge resistor 12 of the capacitor 1 and a second switch 13 having DC current breaking capability and current conduction capability smaller than that of the first switch 7 are connected with each other in series. Both ends of a charging circuit of a capacitor composed of an AC power source 9, a diode bridge rectifying circuit 10 for rectifying the AC, and a charging resistor 11 of the capacitor 1 are connected with a connection point of the discharge resistor 12 and the second switch 13 and a connection point of the inductance element 3 and the capacitor 1. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is mainly installed between a DC power source and a load (feeder) of a DC substation for electric railways, and is used to protect the DC power source by separating it from the load in the event of a load short circuit accident. It is related with the direct-current high-speed vacuum circuit breaker containing.

  FIG. 6 is a diagram showing a schematic configuration of a conventional DC high-speed vacuum interrupter disclosed in Patent Document 1, for example. A vacuum valve 4 that is connected between the DC power source 14 and the load 15 and cuts off the direct current, a non-linear resistor 5 that is connected in parallel to the vacuum valve 4 and absorbs energy stored in the inductance of the wiring, and a saturable reactor 6 A first series circuit S1 connected in series, a capacitor 1, an inductance element 3, and a commutation switch 2 connected in series to the first series circuit S1, a first series circuit S1, The second series circuits S 1 and S 2 are configured to be connected in parallel via the first switch 7. A discharge resistor 12 is connected in parallel to the series circuit S2. A capacitor 1 charging circuit including an AC switch 7, an AC power source 9, a diode bridge rectifier circuit 10, and a charging resistor 11 is connected to a connection point between the capacitor 1 and the inductance element 3, and a connection point between the discharge resistor 12 and the capacitor 1. Has been.

  In such a configuration, by closing the switch 8, the capacitor 1 is charged to the polarity shown in FIG. 6 up to a predetermined DC voltage, and the capacitor 1 is always kept at a constant voltage for shutting off and is on standby. is doing. Further, the discharge resistor 12 is connected in parallel to the first series circuit to form a discharge circuit for the capacitor 1, and when the discharge of the capacitor 1 is necessary, the commutation switch 2 is ignited to rapidly charge the capacitor 1. Operates to discharge. The switch 7 is provided between the first series circuit and the second series circuit, and releases the second series circuit S2 after being cut off.

 Next, the operation of such a DC high-speed vacuum interrupter will be described. Provided between the DC power supply 14 and the load 15, for example, a feeder, the load current always flows through the vacuum valve 4 and the saturable reactor 6. The capacitor 1 is charged in advance with the polarity shown in FIG. 6 by a charging circuit including an AC power source 9, an AC power source switch 8, a diode bridge rectifier circuit 10 that rectifies the AC of the AC power source 9, and a charging resistor 11.

  At this time, when an interruption signal is given from the outside or when an abnormal current of the load 15 is detected, the vacuum bubble 4 is first opened, and immediately thereafter, the commutation switch 2 is turned on. Then, a series resonance circuit is configured by a loop of the capacitor 1, the vacuum valve 4, the saturable reactor 6, the commutation switch 2, and the inductance element 3, and a resonance current flows due to the electric charge stored in the capacitor 1. The values of the capacitor 1 and the inductance element 3 and the initial charging voltage of the capacitor 1 are determined so that the maximum value of the current is larger than the predicted maximum value of the load current.

  After the vacuum valve 4 is opened, the main circuit current continues to flow as an arc. At this time, the resonance current flows in a manner superimposed on the main circuit current, and the maximum value of the resonance current is larger than the main circuit current. The current in the valve 4 exceeds the zero point and tries to reverse the polarity. At this time, the saturable reactor 6 is released from saturation and becomes a high inductance, and the rate of change of current is weakened.

  When the current exceeds the zero point, the arc in the vacuum valve 4 is extinguished, and the insulation is restored in the gap. After that, the voltage of the commutation capacitor 1 continues to rise in the opposite direction to the initial charge polarity due to the energy stored in the inductance element 3 of the commutation circuit and the stray inductance present in the load.

  When this voltage increases to some extent, a current flows through the non-linear resistor 5, the load current attenuates, and eventually the current flowing through the second series circuit becomes zero.

However, after that, when there is a potential difference between the power source 14 and the load 15, a direct current continues to flow through the charging resistor 11, the discharging resistor 12 and the first switch 7 through the path shown in FIG. In such a case, since the thyristor continues to be turned on even when the gate is turned off, the interruption of the load current is not completed. Therefore, finally, the switch 7 is opened to completely shut off the circuit.
JP-A-2003-123569

  Since the conventional charging circuit is configured as shown in FIG. 7, an arrow path (commutation) from the DC power source 14 toward the load 15 is obtained after the current interruption of the vacuum valve 4 is completed when the interruption operation is performed. It continues to flow through the switch 2, the commutation reactor 3, the discharge resistor 12, or the charging resistor 11 and the diode rectifier 10). Since this current is a direct current, the switch 7 needs to have a capability of interrupting the direct current when opened, and a large current needs to be applied when the switch 7 is interrupted, resulting in an increase in both size and cost.

  The present invention has been made to solve the above problems, and provides a small and inexpensive DC high-speed vacuum interrupter that can completely open the DC power supply and load by using a switch that does not require current interrupting capability. The purpose is to do.

In order to achieve the object, the invention corresponding to claim 1 includes a first series circuit including a vacuum valve connected in series between a DC power source and a load, and the first series circuit includes the first series circuit. One end is connected to a connection point with a DC power source, a second series circuit in which a capacitor, a commutation switch, and an inductance element are connected in series, the other end of the second series circuit, the load, and the Connected to the connection point of the vacuum valve, connected in parallel to the first switch that does not have DC current blocking capability and the second series circuit, and has the discharge resistance of the capacitor and DC current blocking capability A third series circuit formed by connecting in series a second switch having a smaller current-carrying capacity than the first switch, a connection point between the discharge resistor and the second switch, and a connection point between the inductance element and the capacitor; Connect both ends to And a capacitor charging circuit that can charge the capacitor,
When a shut-off command is input, an open command for the vacuum valve, a turn-on command for the commutation switch, an open command for the second switch, and an open command for the first switch sequentially A direct current high-speed vacuum shut-off device characterized by comprising a control device for giving.

  In order to achieve the above object, the invention corresponding to claim 2 includes a first series circuit including a vacuum valve connected in series between a DC power source and a load, and the first series circuit includes the first series circuit. One end is connected to a connection point with a DC power source, a second series circuit in which a capacitor, a commutation switch, and an inductance element are connected in series, the other end of the second series circuit, the load, and the A first switch that is connected between the connection points of the vacuum valve and does not have a direct current interruption capability, and one end thereof is connected to a connection point between the capacitor and the inductance element, and has a direct current interruption capability and the first switch. A second switch having a smaller current-carrying capacity than the first switch, the other end of the second switch, a capacitor charging circuit connected to a connection point of the capacitor and the first switch, and capable of charging the capacitor; Blocking When a command is input, an opening command is sequentially given to the vacuum valve, a closing command is given to the commutation switch, an opening command is given to the second switch, and an opening command is given to the first switch. A direct-current high-speed vacuum shut-off device comprising a control device.

  In order to achieve the above object, the invention corresponding to claim 6 includes a first series circuit including a vacuum valve connected in series between a DC power source and a load, and the first series circuit includes the first series circuit. One end is connected to a connection point with a DC power source, a second series circuit in which a capacitor, a commutation switch, and an inductance element are connected in series, the other end of the second series circuit, the load, and the Connected to the connection point of the vacuum valve, connected in parallel to the first switch that does not have DC current blocking capability and the second series circuit, and has the discharge resistance of the capacitor and DC current blocking capability A third series circuit in which a second switch having a smaller current-carrying capacity than the first switch is connected in series, and when a shut-off command is input in a state where the capacitor is charged in advance, the vacuum valve Open command, commutation A DC high-speed vacuum shut-off device comprising a control device that sequentially applies a closing command to the switch, an opening command to the second switch, and an opening command to the first switch. .

  According to the present invention, it is possible to obtain an inexpensive and small-sized DC high-speed vacuum cutoff device by sharing the roles of energization and cutoff with the first switch and the second switch.

  FIG. 1 is a schematic configuration diagram for explaining a first embodiment of the present invention, which includes a first series circuit S1, a second series circuit S2, a third series circuit S3, and a first series circuit. Switch 7, a capacitor charging circuit, and a control device 20.

  The first series circuit S1 is connected between the DC power supply 14 and the load 15 in parallel with the vacuum valve 4, the non-linear resistance 5 that absorbs the energy stored in the wiring inductance, and is saturable. A reactor 6 is connected in series.

  The second series circuit S2 is formed by connecting the capacitor 1, the inductance element 3, and the commutation switch 2 in series, and one end thereof is connected to the connection point between the first series circuit S1 and the DC power source 14.

  The first switch 7 is connected between the other end of the second series circuit S2 and the connection point between the load 15 and the vacuum valve 4, and does not have a DC current blocking capability.

  The third series circuit S3 is connected in parallel to the second series circuit S2, and has a discharge resistance 12 of the capacitor 1 and a second switch having a direct current interruption capability and a smaller current carrying capability than the first switch 7 described later. 13 are connected in series.

  The capacitor charging circuit is capable of charging the capacitor 1 by connecting both ends to the connection point of the discharge resistor 12 and the second switch 13 and the connection point of the inductance element 3 and the capacitor 1. An AC power supply 9, a diode bridge rectifier circuit 10 for rectifying the AC, and a charging resistor 11 for the capacitor 1 are provided.

  As shown in FIG. 2, the control device 20 receives an opening command for the vacuum valve 4, a closing command for the commutation switch 2, an opening command for the second switch 13, The opening command is sequentially given to one switch 7. In FIG. 2, T1 is the opening time of the vacuum valve 4, T2 is the current decay time, and T3 is the opening time of the switch 13.

  Next, the operation of the first embodiment configured as described above will be described with reference to FIGS. The initial operation when cutting off the load current is exactly the same as the conventional example. That is, the DC high-speed vacuum circuit breaker is provided between the DC power supply and the load (feed wire), and the load current always flows through the vacuum valve 4 and the saturable reactor 6. The capacitor 1 is charged in advance with the polarity shown in FIG. 1 by a charging circuit. At this time, a charging current flows through the second switch 13, but its magnitude is a very small current limited by the charging resistor 11.

  When a disconnection command is given from the outside, specifically an overcurrent relay (not shown), or when an abnormal load current is detected, the vacuum bubble 4 is first opened, and immediately thereafter, the commutation switch 2 is turned on. To do. Then, a series resonance circuit is configured by a loop of the capacitor 1, the vacuum valve 4, the saturable reactor 6, the commutation switch 2, and the inductance element 3, and a resonance current flows due to the electric charge stored in the capacitor 1. The values of the capacitor 1 and the inductance element 3 and the initial charging voltage of the capacitor 1 are determined so that the maximum value of the current is larger than the predicted maximum value of the load current. Although this resonance current is very large, it passes through the first switch 7 but does not flow through the second switch 13. Only a very small current limited by the discharge resistor 12 flows through the switch 13.

  After the vacuum valve 4 is opened, the main circuit current continues to flow as an arc. At this time, the resonance current flows in a manner superimposed on the main circuit current, and the maximum value of the resonance current is larger than the main circuit current. The current in the valve 4 exceeds the zero point and tries to reverse the polarity. At this time, the saturable reactor 6 is released from saturation and becomes a high inductance, and the rate of change of current is weakened. When the current exceeds the zero point, the arc in the vacuum valve 4 is extinguished, and the insulation is restored in the gap. After that, the voltage of the commutation capacitor 1 continues to rise in the opposite direction to the initial charge polarity due to the energy stored in the inductance element 3 of the commutation circuit and the stray inductance present in the load. When this voltage increases to some extent, a current flows through the non-linear resistor 5, the load current attenuates, and eventually the current flowing through the first series circuit S1 becomes zero.

  However, when there is a potential difference between the power supply 14 and the load 15 thereafter, for example, a direct current continues to flow through the charging resistor 11, the discharging resistor 12, the switch 13, and the switch 7 through the path shown in FIG. In such a case, the commutation switch 2 continues to be turned on even when the gate is turned off, so that the interruption of the load current is not completed. For this reason, the switch 13 is first opened after a predetermined time has elapsed since the start of the blocking operation.

  However, since only a very small current limited by the charging resistor 11 and the discharging resistor 12 flows through the switch 13 at this time, the switch 13 may have an energization capability and a blocking capability of the minimal current. After the switch 13 is opened, the switch 7 is subsequently opened to completely open the DC power supply 14 and the load 15. When the switch 7 is opened, since no load current flows through the switch 7, the current interruption capability is not required unlike the conventional device.

  According to the first embodiment described above, the second switch 13 having a small capacity and capable of opening direct current is inserted in series with the charging resistor 11 and / or the discharging resistor 12 of the capacitor 1 provided in the conventional device, By opening the switch 13 before opening the first switch 7, the DC cut-off capability of the first switch 7 becomes unnecessary. Since the second switch 13 is provided in a route where a large oscillating current or load current does not flow during the cutoff operation, a switch having a very small capacity can be applied.

  FIG. 3 is a schematic configuration diagram showing a second embodiment of the present invention. The difference from FIG. 1 is that the discharge resistor 12 is omitted. The control device 20 shown in FIG. 1 is omitted, but this is actually necessary. Specifically, a vacuum valve 4, a non-linear resistor 5 that is connected in parallel to the vacuum valve 4 between the DC power source 14 and the load 15 and absorbs energy stored in the wiring inductance, and a saturable reactor 6 Are connected in series to a first series circuit S1, and one end of a second series circuit S2 formed by connecting a capacitor 1, an inductance element 3, and a commutation switch 2 in series to the first series circuit S1 It is connected to a connection point with the power source 14.

  The first switch 7 is connected between the other end of the second series circuit S2 and the connection point between the load 15 and the vacuum valve 4, and the first switch 7 does not have a DC current blocking capability. It is.

What has been described above is the same as that of FIG. 1 and differs in the following points.

  That is, the first switch 7 does not have a direct current interruption capability, and is connected between the connection point between the capacitor 1 and the vacuum valve 4 and the connection point between the load 15 and the vacuum valve 4. . The second switch 13 has a DC current blocking capability and a smaller energization capability than the first switch 7, and one end of the second switch 13 is connected to the connection point between the capacitor 1 and the inductance element 3. 1 is connected to the connection point of the capacitor 1 and the first switch 7 with the same capacitor charging circuit as in the embodiment of FIG.

  In such a configuration, the control device 20 is provided as in the embodiment of FIG. When the shutoff command is input, the control device 20 opens the vacuum valve 4, inputs the commutation switch 2, opens the second switch 13, and opens the first switch 7. Open commands are given sequentially.

  Next, the operation of the second embodiment shown in FIG. 3 will be described. The initial operation when the load current is cut off is the same as that of the conventional example or the first embodiment, and is omitted. At the time of interruption, a resonance current flows due to the electric charge stored in the capacitor 1. Although this resonance current is very large, it passes through the first switch 7, but only a very small current limited by the discharge resistor 12 flows through the switch 13. Even after the vacuum valve 4 is shut off, when there is a potential difference between the DC power supply 14 and the load 15, the DC current continues to flow through the rectifier circuit 10, the charging resistor 11 and the switch 13. In such a case, the commutation switch 2 continues to be turned on even when the gate is turned off, so that the interruption of the load current is not completed. Therefore, the second switch 13 is first opened after a predetermined time has elapsed from the start of the shut-off operation. However, since only a very small current, which is limited by the charging resistor 11, flows through the second switch 13 at this time, the second switch 13 only needs to have a current-carrying capability and a blocking capability of the minimal current. After the second switch 13 is opened, the first switch 7 is subsequently opened to completely open the DC power supply 14 and the load 15. When the first switch 7 is opened, no load current flows through the first switch 7, so that the current interruption capability is not required as in the conventional device.

  FIG. 4 is a diagram for explaining a third embodiment of the present invention. The difference from FIG. 1 is that the charging circuit for the capacitor 1 in FIG. 1 is omitted. The charging circuit includes an AC power source 9, a diode bridge rectifier circuit 10 that rectifies the AC, and a charging resistor 11 for the capacitor 1.

  In the embodiment having such a configuration, the capacitor 11 is charged by a circuit (not shown). Reference numeral 13 denotes a second switch, which is a switch that has only a minimum current supply capability as compared with the first switch 7 but has a DC current cutoff capability. The second switch 13 is inserted in series with the discharge resistor 12.

  Next, the operation of the third embodiment shown in FIG. 4 will be described. The initial operation when the load current is cut off is the same as that of the conventional example or the first embodiment, and is omitted. When cut off, a resonance current flows due to the electric charge stored in the capacitor 1, and this resonance current is very large and passes through the first switch 7, but the second switch 13 has only a very small current limited by the discharge resistor 12. Flowing. If there is a potential difference between the power supply and the load even after the vacuum valve is shut off, a direct current continues to flow through the diode discharge resistor 12, the second switch 13, and the first switch 17. In such a case, the commutation switch 2 continues to be turned on even when the gate is turned off, so that the interruption of the load current is not completed. Therefore, the second switch 13 is first opened after a predetermined time has elapsed from the start of the shut-off operation. However, since only a very small current limited by the resistor 12 flows through the second switch at this time, the second switch only needs to have the ability to energize and shut off the minimum current. After the second switch is opened, the first switch is subsequently opened to completely open the power source and the load. When the first switch is opened, no load current flows through the first switch 7, so that the current interruption capability is not required as in the conventional device.

(Modification)
In the first to third embodiments described above, the circuit in which the non-linear resistance 5 is connected in parallel with the vacuum valve 4 has been described. However, a circuit in which the non-linear resistance 5 is not connected or a surge absorption circuit in place thereof is used. It is obvious that the same effect can be obtained even if the present invention is applied to a connected circuit.

  Further, the commutation switch 2 in each of the embodiments is not limited to the thyristor, and it is obvious that the same effect can be obtained by applying the present invention even when a mechanical switch having no DC cutoff capability is used.

  Furthermore, although each embodiment demonstrated using the circuit which connected the saturable reactor 6 in series with the vacuum valve 4, this saturable reactor 6 is connected in order to ease the interruption | blocking duty of the vacuum valve 4 It can be omitted depending on the performance of the vacuum valve 4.

  In each embodiment, the second switch 13 requires a switch capable of interrupting a minute direct current, but the resonance current and the main circuit current do not flow through this path and are limited by resistance. Since only a small current flows, a small capacity is sufficient for the current-carrying capacity, so that both cost and size can be reduced.

  As the second switch 13, for example, a self-extinguishing type semiconductor element having a very small current capacity can be used. FIG. 5 shows an example of the configuration, which includes a switch in which a circuit in which an IGBT (insulated gate bipolar transistor) and a diode are connected in antiparallel is connected in series in the reverse direction. Also in this case, the first switch 7 does not need a current interruption capability unlike the conventional device, so that an inexpensive and small switch can be used.

  In the above-described embodiment (FIG. 1), the charging circuit for the capacitor 1 provided with the charging resistor 11 is taken as an example. However, the charging resistor 11 is not provided in the charging circuit and may be as follows. That is, one end of the charging resistor 11 of the capacitor 1 is connected to at least one of a connection point between the capacitor 1 and the inductance element 3 and a connection point between the discharge resistor 12 and the second switch 13. It is also possible to connect to the other end of the first and the connection points of the discharge resistor 12 and the second switch 13.

  In the above-described embodiment (FIG. 3), the charging circuit for the capacitor 1 is provided with the charging resistor 11 as an example. However, the charging resistor 11 is not provided in the charging circuit and may be as follows. .

The capacitor charging circuit includes an AC power supply 8 and a rectifier circuit 10 that rectifies the AC, and the other end of the second switch 13 having one end connected to a connection point between the capacitor 1 and the inductance element 3. One end of the charging resistor 11 of the capacitor 1 is connected to at least one of the connection points of the capacitor 1 and the first switch 7, and the capacitor charging circuit includes the other end of the charging resistor 11, the discharge resistor 12, and the second switch 13. You may make it connect to the connection point of.

BRIEF DESCRIPTION OF THE DRAWINGS The figure for demonstrating 1st Embodiment of the direct-current high-speed vacuum interrupter by this invention. The time chart for demonstrating at the time of interruption | blocking operation | movement of embodiment of FIG. The figure for demonstrating 2nd Embodiment of the direct-current high-speed vacuum interrupter by this invention. The figure for demonstrating 3rd Embodiment of the direct-current high-speed vacuum interrupter by this invention. The figure for demonstrating the commutation switch of FIG.1, FIG.3, FIG.4. The figure for demonstrating the conventional direct current | flow high-speed vacuum interruption | blocking apparatus. The figure for demonstrating the operation | movement of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Capacitor, 2 ... Commutation switch, 3 ... Inductance element, 4 ... Vacuum valve, 5 ... Nonlinear resistance, 6 ... Saturable reactor, 7 ... 1st switch, 8 ... AC switch, 9 ... AC power supply, 10 ... Diode bridge rectifier circuit, 11: charging resistor, 12: discharging resistor, 13: second switch, 14: DC power supply, 15: load.

Claims (8)

A first series circuit including a vacuum valve connected in series between a DC power source and a load;
A second series circuit formed by connecting one end of the first series circuit to a connection point with the DC power source and connecting a capacitor, a commutation switch, and an inductance element in series;
A first switch connected between the other end of the second series circuit and a connection point of the load and the vacuum valve, and having no DC current blocking capability;
A third series circuit connected in parallel to the second series circuit, and connected in series with a discharge resistor of the capacitor and a second switch having a DC current blocking capability and a smaller current carrying capability than the first switch. When,
A capacitor charging circuit capable of charging the capacitor by connecting both ends thereof to a connection point of the discharge resistor and the second switch, and a connection point of the inductance element and the capacitor;
When a shut-off command is input, an open command for the vacuum valve, a turn-on command for the commutation switch, an open command for the second switch, and an open command for the first switch sequentially A control device to give,
DC high-speed vacuum circuit breaker characterized by comprising. A first series circuit including a vacuum valve connected in series between a DC power source and a load;
A second series circuit formed by connecting one end of the first series circuit to a connection point with the DC power source and connecting a capacitor, a commutation switch, and an inductance element in series;
A first switch connected between the other end of the second series circuit and a connection point of the load and the vacuum valve, and having no DC current blocking capability;
A second switch having one end connected to a connection point between the capacitor and the inductance element, a DC current blocking capability, and a smaller energization capability than the first switch;
A capacitor charging circuit connected to the other end of the second switch, and a connection point of the capacitor and the first switch, and capable of charging the capacitor;
When a shut-off command is input, an open command for the vacuum valve, a turn-on command for the commutation switch, an open command for the second switch, and an open command for the first switch sequentially A control device to give,
DC high-speed vacuum circuit breaker characterized by comprising.   3. The DC high-speed vacuum circuit breaker according to claim 1, wherein the capacitor charging circuit includes an AC power supply, a rectifying circuit for rectifying the AC, and a charging resistor for the capacitor.   The capacitor charging circuit includes an AC power source and a rectifier circuit that rectifies the AC, and at least a connection point between the capacitor and the inductance element and a connection point between the discharge resistor and the second switch. One end of a charging resistor of the capacitor is connected to one side, and the capacitor charging circuit is connected to the other end of the charging resistor and a connection point of the discharging resistor and the second switch. 1. A DC high-speed vacuum interrupter according to 1.   The capacitor charging circuit includes an AC power source and a rectifier circuit that rectifies the AC, and the other end of a second switch having one end connected to a connection point between the capacitor and the inductance element, and the One end of a charging resistor of the capacitor is connected to at least one of a connection point between the capacitor and the first switch, and the capacitor charging circuit is connected to the other end of the charging resistor, the discharge resistor, and the second switch. 3. The DC high-speed vacuum interrupter according to claim 2, wherein the DC high-speed vacuum interrupter is connected to a point. A first series circuit including a vacuum valve connected in series between a DC power source and a load;
A second series circuit formed by connecting one end of the first series circuit to a connection point with the DC power source and connecting a capacitor, a commutation switch, and an inductance element in series;
A first switch connected between the other end of the second series circuit and a connection point of the load and the vacuum valve, and having no DC current blocking capability;
A third series circuit connected in parallel to the second series circuit, and connected in series with a discharge resistor of the capacitor and a second switch having a DC current blocking capability and a smaller current carrying capability than the first switch. When,
When a shut-off command is input with the capacitor charged in advance, an open command for the vacuum valve, a turn-on command for the commutation switch, an open command for the second switch, the first command A control device for sequentially giving an opening command to the switches of
DC high-speed vacuum circuit breaker characterized by comprising.   4. The apparatus according to claim 1, further comprising at least one of a non-linear resistor connected in parallel to the vacuum valve and a saturable reactor inserted at a connection point between the DC power source and the vacuum valve. The direct current | flow high-speed vacuum circuit breaker as described in any one of these.   The second switch includes a plurality of anti-parallel connection circuits in which a self-extinguishing semiconductor element and a diode are connected in anti-parallel, and each anti-parallel connection circuit is connected in series in the reverse direction. The direct current | flow high-speed vacuum interrupter as described in any one of Claims 1 thru | or 3.

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