JP2005078950A - Commutation type circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a commutation type circuit breaker capable of interrupting a small current flowing in a main circuit in a short time, capable of appropriately improving current breaking performance. <P>SOLUTION: The commutation type circuit breaker, equipped with a main vacuum switch 1 inserted into the main circuit connecting a power source and a load, and a commutation circuit 5 electrically connected in parallel with the main vacuum switch 1 and composed of a capacitor 2, reactor 3 and a commutation switch 4 electrically connected in series, is provided with an operating control device 9 interlocking the main vacuum switch 1 with the commutation switch 4 at a given operating timing at an open-circuit time of the main circuit, and the operating timing of the main vacuum switch 1 with the commutation switch by the operating control device 9 is changed in accordance with current values of the main circuit. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a commutation type circuit breaker including a circuit breaker composed of a vacuum switch and a commutation circuit connected in parallel thereto.

The DC circuit commutation type interrupting device according to the prior art has a circuit configuration similar to that shown in FIG. 1 showing the circuit configuration according to the embodiment of the present invention.
In FIG. 1, a main vacuum switch 1 is provided as a main contact, and is electrically connected to the main vacuum switch 1 in parallel, each of which is electrically connected in series, a commutation capacitor 2, a commutation reactor 3, and a commutation. A commutation circuit 5 is configured by the switch 4. The non-linear resistor 6 is electrically connected in parallel to the main vacuum switch 1 and the commutation circuit 5. The second vacuum switch 7 is electrically connected in series with a main circuit that connects the DC power supply 10 and the load 11. A current detector 8 for detecting the line current of the main circuit is provided, and the operation control device 9 has a main vacuum switch 1 and a second vacuum switch when the current detected by the current detector 8 reaches a predetermined magnitude. 7 and the commutation switch 4 are given operation commands.

The conventional commutation type shut-off device is configured as described above, and power is supplied to the load 11 from the DC power source 10 via the main vacuum switch 1 and the second vacuum switch 7 during normal load operation. The operation at the time of cutting off the small current in the main circuit is performed as follows (see, for example, Patent Document 1).
First, the main vacuum switch 1 is opened by a command from the operation control device 9. The second vacuum switch 7 is opened almost simultaneously with or after the opening of the main vacuum switch 1. The commutation switch 4 is closed after a predetermined time from the opening of the second vacuum switch 7, whereby a discharge current in a direction opposite to the current of the main circuit starts to flow from the commutation capacitor 2 to the main vacuum switch 1. Thereafter, the current of the main vacuum switch 1 becomes zero, the arc is extinguished, and the current of the commutation circuit 5 starts to flow to the load side. The voltage of the commutation capacitor 2 reaches the voltage of the DC power supply 10, and the interruption of the main circuit current is completed.

  In the no-load open circuit operation in which there is no current in the main circuit, the insulation of the second vacuum switch 7 is restored simultaneously with the start of the open circuit operation, and the commutation circuit 5 and the load 11 are disconnected. Is prevented from flowing out to the load side.

JP-A-5-234471

In the conventional commutation type circuit breaker as described above, when a current flows through the main circuit, the current of the main circuit is continued by the current arc even when the second vacuum switch 7 is opened. 5 discharge current flows out to the load side. In particular, when cutting off a small current of about several tens of A flowing through the main circuit, the main vacuum switch 1 reaches a current zero with a slight discharge current of the commutation circuit and is extinguished / disconnected. The residual voltage is large.
For this reason, depending on the circuit conditions of the load, the discharge current of the commutation circuit 5 may continue to flow to the load side through the second vacuum switch 7 for several hundred milliseconds or more, making it difficult to interrupt the current. Further, at this time, since the current arc continues in the second vacuum switch 7, there is a problem that the deterioration of the contact progresses and the operating life is shortened.

  Further, when the impedance of the load 11 is small, the discharge current of the commutation circuit 5 becomes large, and deterioration due to excessive current inflow of the load equipment or a back-up overcurrent protection device (not shown) connected to the main circuit. There was a problem of unnecessary operation.

  The present invention has been made to solve such a problem, and an object of the present invention is to obtain a commutation type interrupting device capable of accurately improving current interrupting performance.

  The commutation type shut-off device according to the present invention is provided with an operation control device that interlocks the vacuum switch and the commutation switch at a predetermined operation timing when the main circuit is opened, and the vacuum switch by the operation control device and the The operation timing with the commutation switch is changed according to the main circuit current value.

  According to the present invention, it is possible to obtain a commutation type interrupting device that can accurately improve the current interrupting performance.

Embodiment 1 FIG.
A first embodiment of the present invention will be described with reference to FIGS. 1 is a circuit diagram showing a configuration of a commutation type interrupting device according to Embodiment 1. FIG. FIG. 2 is a time chart showing the operation timing and current and voltage waveforms at the time of small current interruption of the commutation type interruption device in the first embodiment. FIG. 3 is a diagram showing the relationship between the magnitude of the breaking current and the operation timing of the switch in the commutation type breaking device in the first embodiment.

In FIG. 1, a main vacuum switch 1 is provided as a main contact, and is electrically connected to the main vacuum switch 1 in parallel, each of which is electrically connected in series, a commutation capacitor 2, a commutation reactor 3, and a commutation. A commutation circuit 5 is configured by the switch 4. The non-linear resistor 6 is electrically connected in parallel to the main vacuum switch 1 and the commutation circuit 5. The second vacuum switch 7 is electrically connected in series to a main circuit that connects the DC power supply 10 and the load 11 and interposes the main vacuum switch 1.
A current detector 8 for detecting the line current of the main circuit is provided, and the operation control device 9 has a main vacuum switch 1 and a second vacuum switch when the current detected by the current detector 8 reaches a predetermined magnitude. 7 and the commutation switch 4 are given operation commands.

  During normal load operation, power is supplied to the load 11 from the DC power supply 10 via the main vacuum switch 1 and the second vacuum switch 7.

The operation of the main circuit when a small current is interrupted will be described with reference to FIG.
(A) is the time when the commutation switch 4 is closed by a command from the operation control device 9 and the main vacuum switch 1 is closed, so that the discharge current from the commutation capacitor 2 is the main vacuum switch 1. And begins to flow in a closed circuit composed of the commutation circuit 5. (B) is the time when the main vacuum switch 1 is opened, and a current arc is generated between the contacts. (C) is the time when the current of the main vacuum switch 1 becomes zero and the arc is extinguished, and the current of the commutation circuit 5 starts to flow to the load side. (D) is the time when the second vacuum switch 7 is subsequently opened, and a current arc is generated between the contacts. (E) is the time when the voltage of the commutation capacitor 2 reaches the voltage of the DC power supply 10 and the interruption of the main circuit current is completed.

FIG. 3 is a relationship diagram between the preceding discharge time of the commutation switch, which is the time difference between the opening of the main vacuum switch 1 and the closing of the commutation switch 4, and the cutoff current value of the main circuit.
The timing of each switch is controlled according to the current of the main circuit detected by the current detector 8 and the relationship shown in FIG. In order to cut off the main circuit current, the current of the commutation circuit 5 exceeding the current of the main circuit is required in order to cause the main vacuum switch 1 to generate a current of zero, and a plurality of values that vary depending on the current value of the main circuit The time timing is set in the operation control device 9. For example, when the current of the main circuit is small, the current discharged from the commutation capacitor 2 is sufficiently larger than the main circuit current. Therefore, by increasing the preceding discharge time, the charge of the commutation capacitor 2 is increased. The current of the commutation circuit 5 at the time (b) is reduced to an optimum value. As the current of the main circuit increases, the current of the commutation circuit 5 necessary for interruption also increases, so the preceding discharge time is set short. Furthermore, since the maximum discharge current of the commutation circuit 5 is necessary for an excessive current such as a short circuit accident, the main vacuum valve 1 is opened before the commutation switch 4 is closed as in the conventional technique. .

In the commutation type breaker configured as described above, since the discharge of the commutation capacitor 2 precedes the opening of the main vacuum switch 1 and the charge of the commutation capacitor 2 is consumed, the current of the commutation circuit 5 is loaded. At the time point (c) when the flow begins to flow to the side, the voltage of the commutation capacitor 2 has dropped to an appropriate level, the current flowing to the load side via the second vacuum switch 7 becomes smaller, and the main circuit current is cut off Is completed (from time (c) to time (e)).
Further, since the second vacuum switch 7 is opened after the current of the commutation circuit 5 starts to flow to the load side (at time (c)), the duration time of the current arc generated between the contacts is short, and the wear deterioration is reduced. Hard to occur.

  As is apparent from the above, the operation control device 9 is provided to interlock the main vacuum switch 1 and the commutation switch 4 at a plurality of time timings that vary according to the main circuit current value when the main circuit is opened. In the small current open circuit of the circuit, after closing the commutation switch 4, the time timing for opening the main vacuum switch 1 is set optimally, thereby reducing the value of the current flowing to the load side after the current interruption of the main circuit, And the continuation time can be shortened. For this reason, the current inflow to the main circuit and the load device is reduced, and the current interruption is completed in a short time, thereby improving the reliability of the circuit including the commutation type interruption device. In addition, the size and duration of the current arc generated in the second vacuum switch 7 can be shortened. For this reason, the contact wear deterioration of the second vacuum switch 7 is reduced, and the life of the number of operations can be extended.

  According to the first embodiment of the present invention, the main vacuum switch 1 inserted in the main circuit connecting the power source 10 and the load 11 is electrically connected to the main vacuum switch 1 in parallel, and In a commutation type circuit breaker comprising a commutation circuit 5 comprising a capacitor 2, a reactor 3 and a commutation switch 4 connected in series, the main vacuum switch 1 and the commutation switch 4 when the main circuit is opened. And a plurality of operation timings of the main vacuum switch 1 and the commutation switch 4 selected by the operation control device 9 according to a main circuit current value. Because it is linked according to any of the set timings, it is possible to obtain a commutation type interrupting device that can interrupt a small current flowing in the main circuit in a short time and improve the current interrupting performance accurately. Kill.

  According to the first embodiment of the present invention, in the configuration of the preceding paragraph, in the small current opening operation of the main circuit, the operation control is performed so that the main vacuum switch 1 is opened after the commutation switch 4 is closed. Since the operation timing of the main vacuum switch 1 and the commutation switch 4 is set by the apparatus, a small current flowing through the main circuit can be cut off in a short time, the current cut-off performance can be improved accurately, and the current cut-off of the main circuit It is possible to obtain a commutation type interrupting device that can reduce the current value that flows into the load later and shorten the duration.

  Furthermore, according to the first embodiment of the present invention, the first vacuum switch comprising the main vacuum switch 1 inserted in the main circuit connecting the power source 10 and the load 11 in the configuration of the preceding paragraph or the preceding paragraph. A commutation circuit 5 comprising a capacitor 2, a reactor 3 and a commutation switch 4 electrically connected in parallel to the first vacuum switch comprising the main vacuum switch 1 and electrically connected in series; In the commutation type breaker provided with a second vacuum switch comprising a vacuum switch 7 interposed between the commutation circuit 5 and a load 11, the main vacuum switch 1 is provided when the main circuit is opened. An operation control device 9 is provided for interlocking the first vacuum switch and the commutation switch 4 at a predetermined operation timing, and the first vacuum switch comprising the main vacuum switch 1 by the operation control device 9 is provided. And the commutation switch 4 are operated according to the main circuit current value, and the second vacuum switch comprising the vacuum switch 7 is opened after the current of the commutation circuit 5 begins to flow to the load. As a result, a commutation type interrupting device that can interrupt a small current flowing in the main circuit in a short time, accurately improve the current interrupting performance, and reliably suppress the current inflow to the load after the main circuit current is interrupted. Can be obtained.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a circuit diagram showing a configuration of the commutation type interrupting device in the second embodiment.
In the second embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in the first embodiment described above, and exhibits the same operation. In the drawings, the same reference numerals indicate the same or corresponding parts.

  FIG. 4 is a circuit diagram of a commutation type interrupting device according to Embodiment 2 of the present invention. In Example 2, the second vacuum switch 7 ′ is connected between the commutation circuit 5 and the main vacuum switch 1. On the parallel circuit, they are configured to be electrically connected in series from those connection portions to the commutation circuit side, that is, between the commutation circuit 5 and the main vacuum switch 1.

In the second embodiment, normally, the current of the main circuit is energized only through the main vacuum switch 1 without passing through the second vacuum switch 7 ′. Therefore, since the number of contacts of the energization part is halved, the electrical resistance is low, and energization heat generation hardly occurs.
For this reason, the temperature rise of the apparatus accompanying energization can be suppressed, and the current value flowing through the main circuit can be increased.

  According to the second embodiment of the present invention, the first vacuum switch composed of the main vacuum switch 1 inserted in the main circuit connecting the power source 10 and the load 11, and the first vacuum switch composed of the main vacuum switch 1. A commutation circuit 5 which is electrically connected to the vacuum switch in parallel and is composed of a capacitor 2, a reactor 3 and a commutation switch 4 electrically connected in series, and between the commutation circuit 5 and the load 11 In the commutation type breaker provided with a second vacuum switch comprising a vacuum switch 7 ′ inserted in the main circuit, the first vacuum switch comprising the main vacuum switch 1 and the commutation switch when the main circuit is opened 4 is provided with an operation control device 9 for interlocking with a predetermined operation timing, and the operation timing of the first vacuum switch comprising the main vacuum switch 1 and the commutation switch 4 by the operation control device 9 Is changed according to the main circuit current value, and the second vacuum switch consisting of the vacuum switch 7 ′ is changed to the first vacuum switch consisting of the main vacuum switch 1 when the first vacuum switch consisting of the main vacuum switch 1 is closed. A second vacuum switch comprising the vacuum switch 7 'is connected between the commutation circuit 4 and the first vacuum switch comprising the main vacuum switch 1 so that the main circuit current is bypassed by the vacuum switch. Since the circuit is opened after the current of the commutation circuit 4 begins to flow to the load, the small current flowing in the main circuit can be cut off in a short time, the current interruption performance can be improved accurately, and the main circuit current interruption It is possible to obtain a commutation type interrupting device capable of avoiding energization heat generation in the second vacuum switch provided to suppress the current inflow to the subsequent load.

Embodiment 3 FIG.
A third embodiment of the present invention will be described with reference to FIG. FIG. 5 is a diagram showing the relationship between the preceding discharge time of the commutation switch and the cutoff current value of the main circuit in the third embodiment.
In the third embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in the first embodiment described above, and has the same function. In the drawings, the same reference numerals indicate the same or corresponding parts.

FIG. 5 is a relationship diagram between the preceding discharge time of the commutation switch and the cutoff current value of the main circuit in the commutation type interrupting device according to Embodiment 3 of the present invention. The constituent elements are the same as those of the apparatus of the first embodiment.
When there is no current in the main circuit, it is detected by the current detector 8 and the commutation switch 4 is not closed, and as a result, the capacitor 2 of the commutation circuit is not discharged and the main vacuum switch 1 is opened. An operation control device 9 set to do is provided.
Note that it is possible to determine the condition in which there is no current in the main circuit based on an external signal, or both, regardless of the current detector 8.

  In the third embodiment, there is no current inflow from the commutation circuit 5 to the main circuit and the load device, and the reliability of the circuit including the commutation type interrupting device is improved. Further, since no current arc is generated in each switch, there is no deterioration of contact wear, and in addition, the commutation capacitor 2 does not perform a discharge operation, so that the operation frequency life of the commutation type breaker can be extended.

  According to the third embodiment of the present invention, in the configuration in the first or second embodiment, in the no-load open circuit operation in which there is no current in the main circuit, the commutation switch 4 is not closed. As a result, since the operation timing by the operation control device 9 is set so as to open the main vacuum switch 1 without discharging the capacitor 2 of the commutation circuit 5, a small current flowing in the main circuit is cut off in a short time. In addition, it is possible to obtain a commutation type interrupting device that can improve the current interrupting performance accurately, avoid unnecessary operations during no-load opening, and extend the life.

Embodiment 4 FIG.
A fourth embodiment of the present invention will be described with reference to FIG. FIG. 6 is a diagram showing the relationship between the preceding discharge time of the commutation switch and the cutoff current value of the main circuit in the fourth embodiment.
In the fourth embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in the first embodiment described above, and exhibits the same operation. In the drawings, the same reference numerals indicate the same or corresponding parts.

  FIG. 6 is a relationship diagram between the preceding discharge time of the commutation switch and the cutoff current value of the main circuit in the commutation type interrupting device according to Embodiment 4 of the present invention. The constituent elements are the same as those of the apparatus of the first embodiment.

  In the fourth embodiment, the operation control device 9 is set so that the preceding discharge time of the commutation switch decreases in a linear function according to the current value of the main circuit, and is the same as in the first embodiment. Can be expected.

  According to the fourth embodiment of the present invention, the main vacuum switch 1 inserted in the main circuit connecting the power source 10 and the load 11 is electrically connected in parallel to the main vacuum switch 1, and the electric In a commutation type circuit breaker having a commutation circuit 5 comprising a capacitor 2, a reactor 3 and a commutation switch 4 connected in series, the vacuum switch 1 and the commutation switch 4 Is provided at a predetermined operation timing, and the operation timing of the vacuum switch 1 and the commutation switch 4 by the operation control device 9 is varied in a linear function according to the main circuit current value. Since it did in this way, the commutation type interruption | blocking apparatus which can interrupt | block the small electric current which flows into a main circuit in a short time, and can improve an electric current interruption performance exactly can be obtained.

Embodiment 5 FIG.
A fifth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a diagram showing current and voltage waveforms of main parts when a small current is interrupted in the commutation type interrupting device according to the fifth embodiment.
In the fifth embodiment, the configuration other than the specific configuration described here has the same configuration contents as the configuration in any of the first to fourth embodiments described above, and is similar. It has an effect. In the drawings, the same reference numerals indicate the same or corresponding parts.

  FIG. 7 shows current and voltage waveforms of main parts when a small current is interrupted in the commutation type interrupting device according to Embodiment 5 of the present invention. The commutation switch 4 is closed by the command of the operation control device 9, 1 is a closed circuit, and the discharge current of the commutation circuit 5 is flowing through the closed circuit constituted by the main vacuum switch 1 and the commutation circuit 5. The oscillation period of the discharge current is determined almost uniquely by the circuit constants of the commutation capacitor 2 and the commutation reactor 3. At the time of cutting off the small current, the preceding discharge time of the commutation switch of the first embodiment is changed from the closed circuit of the commutation switch 4 to the current zero point of the main vacuum switch 1 (any of T1, T2 to T6 in FIG. 7). The opening timing of the main vacuum switch 1 is set in the operation control device 9 so that

  In the fifth embodiment, since the main vacuum switch 1 is opened immediately before the current zero point of the main vacuum switch 1, the duration time of the current arc is short and the current value is small. The service life of the commutation type breaker can be extended.

  According to the fifth embodiment of the present invention, in any configuration in the first to fourth embodiments, the main vacuum switch 1 inserted in the main circuit connecting the power source 10 and the load 11; In the commutation type circuit breaker comprising a commutation circuit 5 which is electrically connected to the main vacuum switch 1 in parallel and is composed of a capacitor 2, a reactor 3 and a commutation switch 4 electrically connected in series. An operation control device 9 that links the vacuum switch 1 and the commutation switch 4 at a predetermined operation timing when the main circuit is opened is provided, and the vacuum switch 1 is immediately before the current zero point of the vacuum switch 1 by the operation control device 9. 1 is opened so that a small current flowing through the main circuit can be interrupted in a short time, and the current interrupting performance can be improved accurately and the life can be extended. It is possible to obtain.

Since the embodiment according to the present invention is configured as described above, the following effects can be obtained.
In the commutation type breaker according to the embodiment of the present invention, when the main circuit is opened, the main vacuum switch and the commutation switch are interlocked at a plurality of time timings that vary according to the main circuit current value. Since the apparatus is provided, the current inflow to the main circuit and the load device is reduced, and the current interruption is completed in a short time, thereby improving the reliability of the circuit including the commutation type interruption apparatus.

It is a circuit diagram which shows the structure of the commutation type interruption | blocking apparatus in Embodiment 1 by this invention. It is a time chart figure which shows the operation timing at the time of the small electric current interruption of the commutation type interruption device in Embodiment 1 by this invention, an electric current, and a voltage waveform. It is a diagram which shows the relationship between the magnitude | size of interruption | blocking current in the commutation type interruption | blocking apparatus in Embodiment 1 by this invention, and the operation timing of a switch. It is a circuit diagram which shows the structure of the commutation type interruption | blocking apparatus in Embodiment 2 by this invention. It is a diagram which shows the relationship between the magnitude | size of interruption | blocking current in the commutation type interruption | blocking apparatus in Embodiment 3 by this invention, and the operation timing of a switch. It is a diagram which shows the relationship between the magnitude | size of interruption | blocking current in the commutation type interruption | blocking apparatus in Embodiment 4 by this invention, and the operation timing of a switch. It is a time chart figure which shows the electric current and voltage waveform in the commutation type interruption device in Embodiment 5 by this invention.

Explanation of symbols

1 main vacuum switch, 2 commutation capacitor, 3 commutation reactor, 4 commutation switch, 5 commutation circuit, 6 nonlinear resistor, 7, 7 'second vacuum switch, 8 current detector, 9 operation control device, 10 DC power supply, 11 load.

Claims (7)

  A vacuum switch inserted in a main circuit for connecting a power source and a load, and a commutator composed of a capacitor, a reactor and a commutation switch electrically connected in parallel to the vacuum switch and connected in electrical series. In the commutation type circuit breaker having a flow circuit, an operation control device is provided for interlocking the vacuum switch and the commutation switch at a predetermined operation timing when the main circuit is opened, and the vacuum switch by the operation control device is provided. A commutation type interrupting device characterized in that the operation timing with the commutation switch is changed in accordance with a main circuit current value.   A vacuum switch inserted in a main circuit for connecting a power source and a load, and a commutator composed of a capacitor, a reactor and a commutation switch electrically connected in parallel to the vacuum switch and connected in electrical series. In the commutation type circuit breaker having a flow circuit, an operation control device is provided for interlocking the vacuum switch and the commutation switch at a predetermined operation timing when the main circuit is opened, and the vacuum switch by the operation control device is provided. A commutation type breaker characterized in that the operation timing with the commutation switch is interlocked according to any of a plurality of setting timings selected according to a main circuit current value.   In the small current open circuit operation of the main circuit, the operation control device sets the operation timing of the vacuum switch and the commutation switch so as to open the vacuum switch after closing the commutation switch. The commutation type interrupting device according to claim 1 or 2.   A first vacuum switch inserted in a main circuit connecting a power source and a load, and a capacitor, a reactor, and a converter electrically connected to the first vacuum switch in parallel and connected in electrical series. In a commutation type circuit breaker comprising a commutation circuit configured by a current switch and a second vacuum switch interposed between the commutation circuit and a load, the first circuit is opened when the main circuit is opened. An operation control device for interlocking the vacuum switch and the commutation switch at a predetermined operation timing is provided, and the operation timing of the first vacuum switch and the commutation switch by the operation control device according to a main circuit current value. The commutation type circuit breaker is characterized in that the circuit is opened and the second vacuum switch is opened after the current of the commutation circuit starts to flow to the load.   A first vacuum switch inserted in a main circuit connecting a power source and a load, and a capacitor, a reactor, and a converter electrically connected to the first vacuum switch in parallel and connected in electrical series. In a commutation type circuit breaker comprising a commutation circuit configured by a current switch and a second vacuum switch interposed between the commutation circuit and a load, the first circuit is opened when the main circuit is opened. An operation control device is provided for interlocking the vacuum switch and the commutation switch at a predetermined operation timing, and the operation timing of the vacuum switch and the commutation switch by the operation control device is varied according to a main circuit current value. The commutation circuit and the first vacuum switch so that the main circuit current is bypassed by the first vacuum switch when the first vacuum switch is closed. Commutation type blocking device being characterized in that so as to open and connect, the second vacuum switch after the time when the current of the commutation circuit starts to flow in the load between.   In the no-load open circuit operation in which there is no current in the main circuit, the operation control is performed so that the commutation switch is not closed, and as a result, the capacitor of the commutation circuit is not discharged and the vacuum switch is opened. The commutation type breaker according to any one of claims 1 to 5, wherein an operation timing by the device is set. A vacuum switch inserted in a main circuit for connecting a power source and a load, and a commutator composed of a capacitor, a reactor and a commutation switch electrically connected in parallel to the vacuum switch and connected in electrical series. In the commutation type circuit breaker provided with the flow circuit, an operation control device is provided for interlocking the vacuum switch and the commutation switch at a predetermined operation timing when the main circuit is opened, and the operation control device provides the operation of the vacuum switch. The commutation type breaker according to any one of claims 1 to 6, wherein the vacuum switch is opened immediately before a current zero point.

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