JP2006236773A - Circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit breaker which can open and close a circuit a number of times at a short interval. <P>SOLUTION: The circuit breaker is composed of a breaker part 1a having 3 phases of a pair of contacts 3 and 4 which can either be closed or opened freely, an electromagnetic repulsive coil part 1c, coupled with the breaker part 1a, having 3 phases of electromagnetic repulsive coil 12 which opens each pair of contacts 3 and 4 of the breaker part 1a, three power supply circuits 20a, 20b and 20c exciting each electromagnetic repulsive coil 12 of the electromagnetic repulsive coil part 1c with discharge currents of capacitors 15a, 15b and 15c, and an operation mechanism part 1d coupled with the electromagnetic repulsive coil part 1c and opens the pair of contacts 3 and 4 of the breaker part 1a. Each of the capacitors 15a, 15b and 15c of the three power supply circuits 20a, 20b, 20c has enough capacity to disconnect each pair of contacts 3 and 4 of the breaker part 1a at a time. The three power supply circuits 20a, 20b, 20c are connected in parallel. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a circuit breaker including an electromagnetic repulsion coil that can improve an open circuit operation among open / close operations.

A conventional vacuum circuit breaker in this type of circuit breaker is known to include an operation mechanism that performs a normal opening / closing operation and an electromagnetic repulsion coil that performs an opening operation at high speed. (For example, refer to Patent Document 1.)
As shown in FIG. 2, the vacuum circuit breaker provided with the electromagnetic repulsion coil includes a cut-off portion 1a, a wipe spring portion 1b connected to the cut-off portion 1a, an electromagnetic repulsion coil portion 1c connected to the wipe spring portion 1b, The operation mechanism unit 1d is configured to open and close the lowermost blocking unit 1a.

  A vacuum valve 5 having a pair of contact points 3 and 4 that can be contacted and separated is provided in the vacuum vessel 2 in the blocking part 1a.

  A wipe spring portion 9 is connected to the wipe spring portion 1 b via an insulating operation rod 7 and a first movable shaft 8 in the axial direction of the movable energizing shaft 6 of the vacuum valve 5. In the wipe spring folder 9, a wipe spring 10 is provided that applies a contact load when the pair of contacts 3 and 4 are in contact with each other.

  The electromagnetic repulsion coil portion 1c is provided with a second movable shaft 11 connected to the wipe spring folder 9 in the axial direction. For example, an epoxy fixed around a fixed member (not shown) around the second movable shaft 11 is provided. An electromagnetic repulsion coil 12 molded with resin is provided. Further, a repulsion ring 13 on the disk is fixed to the second movable shaft 11 so as to face the electromagnetic repulsion coil 12. A capacitor 15 is connected in parallel to the electromagnetic repulsion coil 12 via a thyristor switch 14, and the capacitor 15 is charged from a DC power source 17 via a charging switch 16.

  The operation mechanism unit 1d is provided with an electromagnetic actuator 18 including a permanent magnet, an armature, and an open / close coil connected to the second movable shaft 11, and the blocking unit 1a is opened and closed.

  When the circuit is to be opened, the thyristor switch 14 is turned on to energize the electromagnetic repulsion coil 12 with a current charged from the capacitor 15 in advance. As a result, the electromagnetic repulsion coil 12 is excited, a repulsive force is generated between the electromagnetic repulsion coil 13 and the second movable shaft 11 moves in the opening direction below the figure, and the pair of contacts 3 and 4 are separated. At the same time, the electromagnetic actuator 18 operates to move the second movable shaft 11 in the opening direction below the drawing and to the final opening position. Further, since the capacitor 15 is discharged by the above operation, the charging switch 16 is turned on after this operation, and the capacitor 15 is charged from the DC power source 17. The time required for charging is several tens of seconds. When charging is completed, the charging switch 16 is opened.

In the closed state, the electromagnetic actuator 18 is operated and the second movable shaft 11 is moved in the closed direction in the upper part of the figure, so that the pair of contacts 3 and 4 come into contact with each other.
Japanese Patent Laid-Open No. 10-326546 (Pages 2 and 3, FIG. 5)

  The above conventional circuit breaker has the following problems.

  The circuit breaker has a standard operation duty (JEC-2300-1998) of O-1 min-CO-3 min-CO, where O is the open circuit and C is the closed circuit. However, when multiple lightning strikes under severe conditions such as lightning strikes from a plurality of thunderclouds at short intervals, the second wave can be opened against ground faults during the first lightning strike. Since the charging of the capacitor 15 is not completed with respect to the ground fault at the time of lightning intrusion thereafter, the open circuit operation cannot be performed.

  That is, depending on the power system, when a ground fault occurs at the time of lightning intrusion, the circuit breaker once opens the power system, and forcibly closes after a short time, for example, 0.2 seconds. In a circuit breaker used for a power system incorporating such a forced circuit, it must be forcibly closed in a short time after the circuit is opened and immediately restarted when multiple lightnings as described above enter, but the capacitor 15 is charged. Since the lightning intrusion is shorter than the time, the resumption path cannot be made.

  For this reason, there has been a demand for a circuit breaker that can repeatedly perform the opening and closing operations at short intervals such as O-0.2 seconds-CO-0.2 seconds-CO.

  The present invention has been made to solve the above problem, and an object of the present invention is to obtain a circuit breaker capable of performing multiple opening and closing operations at short time intervals.

  In order to achieve the above object, a circuit breaker according to the present invention is connected to a breaker having a pair of contactable and separable contacts for three phases, and the breaker, and each pair of contacts of the breaker is opened. An electromagnetic repulsion coil portion having three phases of electromagnetic repulsion coils, three power supply circuits for exciting each electromagnetic repulsion coil of the electromagnetic repulsion coil portion with a discharge current of a capacitor, and a pair of blocking portions connected to the electromagnetic repulsion coil portion Each of the capacitors of the three power supply circuits has a capacity capable of opening the pair of contacts of the interrupting unit at once, and these three power supply circuits It is characterized by being connected in parallel.

  According to the configuration of the present invention, since the power supply circuit that excites the electromagnetic repulsion coil with the discharge current of the capacitor is configured in three circuits and connected in parallel, the open circuit operation and the close circuit operation are repeatedly performed at short intervals. be able to.

  Embodiments of a circuit breaker according to the present invention will be described below with reference to the drawings.

  An embodiment of the circuit breaker of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view showing a configuration of a circuit breaker according to the present embodiment. In FIG. 1, the same components as those in the prior art are denoted by the same reference numerals.

  As shown in FIG. 1, the vacuum circuit breaker provided with the electromagnetic repulsion coil includes an interrupting portion 1a, a wipe spring portion 1b connected to the interrupting portion 1a, and an electromagnetic repulsion coil portion 1c connected to the wipe spring portion 1b. And an operation mechanism 1d that opens and closes the lowermost block 1a.

  The blocking part 1 a is provided with a vacuum valve 5 having a pair of contacts 3 and 4 that can be contacted and separated in the vacuum vessel 2.

  In the wipe spring portion 1b, one end of an insulating operation rod 7 is fixed to the end of the movable energizing shaft 6 extending in the axial direction outside the vacuum vessel 2. A wipe spring folder 9 is connected to the other end of the insulating operation rod 7 via a first movable shaft 8. The first movable shaft 8 movably penetrates one side surface of the wipe spring folder 9 and contacts the wipe spring 10 that applies a contact load when the pair of contacts 3 and 4 provided in the wipe spring folder 9 are in contact with each other. is doing.

  A second movable shaft 11 fixed to the other side surface of the wipe spring folder 9 is provided in the electromagnetic repulsion coil portion 1c in the axial direction. Around the second movable shaft 11, there is provided an annular electromagnetic repulsion coil 12 molded with, for example, an epoxy resin fixed to a fixing member (not shown). Further, a repulsion ring 13 on the disk is fixed to the second movable shaft 11 so as to face the electromagnetic repulsion coil 12.

  FIG. 1 shows only one-phase vacuum valve 5, insulating operation rod 7, first movable shaft 8, wipe spring folder 9, second movable shaft 11, electromagnetic repulsion coil 12, and repulsion ring 13. Although not shown, the vacuum circuit breaker according to the present embodiment includes a vacuum valve 5, an insulating operation rod 7, a first movable shaft 8, a wipe spring folder 9, a second movable shaft 11, an electromagnetic repulsion coil 12, and a repulsion ring. 13 is provided for each of three phases, that is, three.

  The three electromagnetic repulsion coils 12 are connected in parallel to each other. In addition, three circuit power supply circuits 20a, 20b, and 20c having the same circuit configuration are connected in parallel to both ends of the winding of the electromagnetic repulsion coil 12. Each of the power supply circuits 20a, 20b, and 20c has a capacity that can excite the electromagnetic repulsion coil 12 through the thyristor switches 14a, 14b, and 14c so that the pair of contacts 3 and 4 can be separated at a time for three phases. For example, the capacitors 15a, 15b, and 15c having a capacity of 1000 V and a capacitance of 8000 μF are included. The capacitors 15a, 15b, and 15c are charged from DC power supplies 17a, 17b, and 17c via charging switches 16a, 16b, and 16c.

  The operation mechanism unit 1d is provided with an electromagnetic actuator 18 including a permanent magnet, an armature, and an open / close coil coupled to the second movable shaft 11, and the three-phase contacts 3 and 4 of the blocking unit 1a. Opening and closing is performed.

  When the circuit is opened, the first power supply circuit 20a is first operated by a signal from a control circuit (not shown). That is, the thyristor switch 14a of the first power supply circuit 20a is turned on, the capacitor 15a charged in advance is discharged, and this current is supplied to the electromagnetic repulsion coil 12. As a result, the electromagnetic repulsion coil 12 is excited, and the repulsion ring 13 in which the counter electromotive force is generated by the magnetic flux generated in the electromagnetic repulsion coil 12, the current flowing by the counter electromotive force and the magnetic flux generated in the electromagnetic repulsion coil 12 are The repulsive force is generated between the electromagnetic repulsion coil 12 and the electromagnetic repulsion coil 12. By this repulsive force, the second movable shaft 11 moves in the opening direction below the figure, and the pair of contacts 3 and 4 are separated. At the same time, the electromagnetic actuator 18 is also operated by a signal from a control circuit (not shown), and the second movable shaft 11 moves in the opening direction below the drawing and moves to the final opening position.

  After the capacitor 15a is discharged, the voltage is detected by a detector (not shown), the charging switch 16a is turned on, and the DC power source 17a is charged. The time required for charging is several tens of seconds. When charging is completed, the charging switch 16a is opened.

  In the closed state, the electromagnetic actuator 18 is operated by a signal from a control circuit (not shown), and the second movable shaft 11 is moved in the closed direction in the upper part of the drawing, so that the pair of contacts 3 and 4 come into contact with each other. .

  Then, when the restarting path state is set in a short time such as 0.2 seconds after the closing, for example, the second power supply circuit 20b is operated by a signal from a control circuit (not shown). Thus, even when the capacitor 15a of the first power supply circuit 20a is being charged, the pair of contacts 3 and 4 in the vacuum valve 5 can be opened by the second power supply circuit 20b. Furthermore, when the circuit is reopened in a short time such as 0.2 seconds after reclosing, the third power supply circuit 20c is operated by a signal from a control circuit (not shown). Thus, even when the capacitors 15a and 15b of the first and second power supply circuits 20a and 20b are being charged, the pair of contacts 3 and 4 in the vacuum valve 5 are opened by the third power supply circuit 20c. Can do.

  That is, when the circuit breaker is opened, then forcedly closed in a short time, and in the operation responsibility to immediately resume, each open circuit operation is performed using separate power supply circuits 20a, 20b, 20c, By sequentially operating the power supply circuits 20a, 20b, and 20c, the resuming path operation and the re-opening operation can be performed within a short time. Therefore, when the open circuit is O and the closed circuit is C, the open circuit operation and the close circuit operation can be repeatedly performed at short intervals such as 0-0.2 seconds-CO-0.2 seconds-CO. Become.

  According to the circuit breaker of the above embodiment, the circuit for exciting the electromagnetic repulsion coil 12 is configured by connecting three power supply circuits 20a, 20b, 20c having the same circuit configuration in parallel, and these power supply circuits 20a, 20b. , 20c are sequentially operated, so that the opening operation and the closing operation can be performed three times at short intervals.

Sectional drawing which shows the structure of one Embodiment of the circuit breaker of this invention. Sectional drawing which shows the structure of the conventional circuit breaker.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Blocking part 1b Wipe spring part 1c Electromagnetic repulsion coil part 1d Operation mechanism part 2 Vacuum vessel 3, 4 Contact point 5 Vacuum valve 6 Movable energizing shaft 7 Insulating operation rod 8 First movable axis 9 Wipe spring folder 10 Wipe spring 11 Second Of the movable shaft 12 Electromagnetic repulsion coil 13 Repulsion ring 14a Thyristor switch 14b Thyristor switch 14c Thyristor switch 15a Capacitor 15b Capacitor 16a Charging switch 16b Charging switch 16c Charging switch 17a DC power source 17b DC power source 17c DC power source 18 Electromagnetic actuator 20a First power circuit 20b Second power circuit 20c Third power circuit

Claims (2)

A blocking portion having a pair of contactable and separable contacts for three phases;
An electromagnetic repulsion coil portion connected to the blocking portion and having three phases of electromagnetic repulsion coils that separate each pair of contacts of the blocking portion;
Three power supply circuits for exciting each electromagnetic repulsion coil of the electromagnetic repulsion coil section with a discharge current of a capacitor;
An operation mechanism unit connected to the electromagnetic repulsion coil unit and opening a pair of contacts of the blocking unit;
Each of the capacitors of the three power supply circuits has a capacity capable of opening each pair of contacts of the interrupting unit at once, and these three power supply circuits are connected in parallel. Circuit breaker.   2. The circuit breaker according to claim 1, wherein each open circuit operation is performed using a separate power supply circuit in the operation responsibility of open circuit-close circuit-open circuit-close circuit-open circuit.

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