JP4592365B2 - Vacuum shut-off device control circuit - Google Patents

Description

  The present invention relates to a control circuit for a vacuum circuit breaker that can improve the opening / closing operation of a vacuum circuit breaker that is driven by electromagnetic repulsion to open a pole.

  The conventional vacuum circuit breaker having electromagnetic repulsion cuts off the overcurrent flowing in the main circuit in a few ms by electromagnetic repulsion, while the general circuit breaker cuts off in a time of several tens of ms to hundreds of tens of ms. The current is prevented from continuously flowing to the load side (see, for example, Patent Document 1).

  As shown in FIG. 5, this vacuum circuit breaker includes a blocking unit 1a that opens and closes the current of the main circuit, an electromagnetic repulsion unit 1b that opens the blocking unit 1a with an electromagnetic repulsive force, and an operation mechanism unit that opens and closes the blocking unit 1a. 1c.

  The blocking portion 1a is provided with a vacuum valve 4 having a pair of electrodes 2 and 3 that can be contacted and separated. In addition, one end of an insulating operation rod 6 is connected to the movable energizing shaft 5 on the movable side outside the vacuum valve 4.

  A movable operating shaft 7 connected to the other end of the insulating operating rod 6 is disposed in the electromagnetic repulsion portion 1 b in the axial direction of the movable energizing shaft 5. Around the movable operation shaft 7, there is provided an electromagnetic repulsion coil 8 fixed to a fixing member of a vacuum shut-off device through which the movable operation shaft 7 is movably inserted. A repulsion plate 9 is fixed to the movable operation shaft 7 on the side of the operation mechanism portion 1 c facing the electromagnetic repulsion coil 8. A wipe spring 10 that applies a contact load between the electrodes 2 and 3 when the blocking portion 1a is closed is provided at the end of the movable operation shaft 7.

  The operation mechanism unit 1 c is provided with an operation mechanism such as an electromagnetic actuator having, for example, a closed coil 11 and an open coil 12 connected to the wipe spring 10. This operation mechanism may be something like a spring operation.

The normal opening / closing of the blocking unit 1a is performed by the operation mechanism unit 1c, and the time from opening to closing or from closing to opening is several tens to several hundreds of ms. Further, when an excessive overcurrent flows, the electromagnetic repulsion part 1b is driven because it is necessary to immediately cut off, and the repulsion plate 9 moves rapidly toward the operation mechanism part 1c. As a result, the overcurrent is interrupted in a short time of several ms from closing to opening.
JP 2002-124162 A (Page 4, FIG. 1)

The above conventional vacuum shut-off device has the following problems.
When the operating mechanism unit 1c is operated to close the blocking unit 1a, if an overcurrent such as an accident current flows in the main circuit, the electromagnetic repulsion unit 1b is driven because it is necessary to immediately disconnect, and the blocking unit 1a The overcurrent is cut off by opening the pole. Although this interruption is performed in a few ms, the operation mechanism unit 1c requires a time of several tens of ms to one hundred and several tens of ms, so that the closing operation is continued.

  For this reason, although the electromagnetic repulsion unit 1b opens the pole, the operation mechanism unit 1c continues the closing operation, so that the blocking unit 1a is closed again. If the interruption | blocking part 1a recloses, an overcurrent will be re-energized and will damage the electric equipment connected to the load side.

  For these reasons, there has been a demand for a control circuit for a vacuum interrupter that reliably holds the opening and prevents reclosing when the electromagnetic repulsion unit 1b is driven.

  The present invention has been made to solve the above problem, and when the electromagnetic repulsion unit is driven to open the breaking unit, the control circuit of the vacuum breaking device improves the opening / closing operation so as to maintain the opened state. The purpose is to obtain.

In order to achieve the above object, a control circuit for a vacuum circuit breaker according to the present invention includes a circuit that operates an operating mechanism to open a pair of electrodes that can be freely contacted and separated, and a circuit that operates the operating mechanism to operate the pair. An electromagnetic repulsion having a closing circuit that closes the electrodes of the electrode, a contact connected in series to the closing circuit, and a repulsion coil that opens the pair of electrodes in a shorter time than the operation mechanism by electromagnetic repulsion. And when the electromagnetic repulsion circuit is driven during operation of the closing circuit, the contact is changed from closed to open, and the closing operation is interrupted .

  According to the present invention, since the contact circuit that operates to close the shut-off part of the vacuum shut-off device by the operation mechanism part is connected in series with the contact that opens from the closed circuit when the electromagnetic repulsion part is driven, When the electromagnetic repulsion unit is driven by the overcurrent of the main circuit immediately after the operating mechanism unit is closed by the operation mechanism unit and the blocking unit is opened, the closing circuit is opened and the open state can be maintained.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, the control circuit of the vacuum interrupter according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a circuit diagram showing a closing circuit and a shut-off circuit of a control circuit of a vacuum interrupter according to Embodiment 1 of the present invention, and FIG. 2 is a diagram showing each part of the control circuit of the vacuum interrupter according to Embodiment 1 of the present invention. It is a figure explaining operation | movement of. In addition, since the structure of a vacuum interrupting device is the same as that of FIG. 5, description is abbreviate | omitted.

  As shown in FIG. 1, the control circuit of the vacuum interrupter includes a first interrupt circuit 20 that opens the interrupter 1a between P (positive polarity) and N (negative polarity), and a first electrode that closes the pole. Are connected in parallel. Further, a second cutoff circuit 22 for controlling the first cutoff circuit 20 and a second closing circuit 23 for controlling the first closing circuit 21 are connected in parallel between PN. Further, an electromagnetic repulsion circuit 24 for driving the electromagnetic repulsion unit 1b is connected in parallel.

  The first breaking circuit 20 is provided in the operation mechanism unit 1c, and has a large current capacity for obtaining an operating force that opens the breaking unit 1a. A contact 31 that closes when 37 is excited is connected in series. In addition, the first closing circuit 21 is provided in the operation mechanism unit 1c, and a closed coil 32 having a large current capacity that can obtain a large operating force similarly to the first breaking circuit 20, and a normally open circuit described later. A contact 33 that is closed when the second coil 42 is excited is connected in series.

  The second cutoff circuit 22 is for control having a smaller current capacity than the first cutoff circuit 20, and is divided into a contact portion 22a and a relay portion 22b. The contact portion 22a is provided with a contact 34 that is closed by a shut-off command from a control circuit (not shown). The relay part 22b is connected in series with a contact 36 and a first coil 37 that are open when the interrupting part 1a is opened at the auxiliary contact of the interrupting part 1a via a protective resistor 35 connected in series with the contact 34. Has been.

  The second making circuit 23 is also for control having a smaller current capacity than the first making circuit 21, and is divided into a contact portion 23a and a relay portion 23b. The contact portion 23a is provided with a contact 38 that is closed by a closing command from a control circuit (not shown).

  The relay part 23b is energized via a protective resistor 39 connected in series with the contact point 38, with the auxiliary contact point of the breaking part 1a being the closing part 40 when the breaking part 1a is open and the first coil 37 being normally closed. Then, the contact 41 that opens, the second coil 42, and the contact 43 that opens when the third coil 46, which will be described later in a normally closed state, is excited are connected in series. In addition, a contact 44 that opens when a fourth coil 50 of an electromagnetic repulsion circuit 24, which will be described later, is normally closed and is excited is connected in series. The contact 44 is provided in the contact portion 23 a adjacent to the fourth coil 50.

  A third coil 46 is connected between the N side of the protective resistor 39 and N via a protective resistor 45.

  The electromagnetic repulsion circuit 24 is divided into a detection unit 24a and a repulsion coil unit 24b.

  The detection unit 24a is provided with a current detection circuit 47 that detects an overcurrent of the main circuit, a first trigger switch 48 that operates immediately upon receiving a signal from the current detection circuit 47, and a power source 49. Further, the current detection circuit 47 is provided with a fourth coil 50 that is excited when the current detection circuit 47 operates.

  The repulsion coil unit 24 b is provided with a second trigger switch 51 that receives a signal from the first trigger switch 48 and immediately closes it, and a thyristor switch 52 that closes with the second trigger switch 51. A capacitor 53 and a repulsion coil 54 are connected in series to the thyristor switch 52 so as to drive the electromagnetic repulsion unit 1b.

  Here, the contact portion 22a of the second breaking circuit 22, the contact portion 23a of the second closing circuit 23, and the detection portion 24a of the electromagnetic repulsion circuit 24 are housed in a control device that is separate from the vacuum breaker. Yes. Further, the first cutoff circuit 20, the first closing circuit 21, the relay portion 22b of the second closing circuit 22, the relay portion 23b of the second closing circuit 23, and the repulsion coil portion 24b of the electromagnetic repulsion circuit 24 are: It is stored in the operation mechanism 1c.

  Further, the first cutoff circuit 20 and the second cutoff circuit 22 constitute a cutoff circuit for opening the cutoff portion 1a. Further, the first closing circuit 21 and the second closing circuit 23 constitute a closing circuit that closes the blocking unit 1a.

  The operation of the control circuit in the case where the overcurrent flows through the main circuit when the blocking unit 1a is closed and immediately opens the contact will be described with reference to FIG.

  When the contact 38 of the second closing circuit 23 is closed at time t1 by a closing command from a control device (not shown), the second coil 42 is excited and the contact 33 is closed. Then, the closing coil 32 is excited and the blocking part 1a is closed. When the blocking unit 1a is closed, the contact 40, which is an auxiliary contact of the blocking unit 1a, is opened, and excitation of the third coil 46 starts.

  It takes a time of several tens of milliseconds until the contact 40 is opened, the third coil 46 starts to be excited, and the contact 43 is opened. Thereby, the input operation is completed.

  However, if an overcurrent is detected by the current detection circuit 47 before the closing operation is completed and at a time t3 after the breaker 1a is closed, the thyristor switch 52 of the electromagnetic repulsion circuit 24 is immediately closed. To do. Then, the repulsion coil 54 is excited and the electromagnetic repulsion unit 1b is driven. At the same time, the fourth coil 50 is excited, and the contact 44 is opened at time t4. These operations are performed in a short time of several ms because it is necessary to open the blocking section 1a at a high speed. In particular, the contact 44 has little time delay until the fourth coil 50 is excited and opened.

  When the contact 44 is opened, the second coil 42 is de-energized, the third coil 46 is excited, and the contact 33 is opened. Further, after time t2 when the contact 43 is opened, the fourth coil 50 is de-energized and the contact 44 is closed at time t5.

  Thus, since the contact 44 is closed at time t5 after the time t2 when the contact 43 is opened, when the electromagnetic repulsion part 1b is driven, the closing part 1a that is continuing the making operation is operated. It will be interrupted and it will be forcibly opened. Further, when viewed from the time when the contacts 43 and 44 are operated, the contact 43 is about to start to open than the time width τ1 from when the contact 44 is opened at time t4 to when it is closed at time t5, and the contact 44 is opened. The time width τ2 from the time t4 to the time t2 when the circuit is actually opened is shorter.

  Thereby, since the contact 44 is open until the time t2 when the contact 43 is opened, the making operation is interrupted. And the interruption | blocking part 1a is maintained in an open state.

  Since the electromagnetic repulsion unit 1b is driven with a large current for a short time, the thyristor switch 52 is opened at a time t6 shorter than the time t2. And the drive of the electromagnetic repulsion part 1b is completed.

  In the case where the contact 44 is not provided, at time t6 when the thyristor switch 52 for driving the electromagnetic repulsion unit 1b is opened, the closing operation is continued with the second coil 42 being excited. 33 is closed. For this reason, although the interruption | blocking part 1a was opened by the drive of the electromagnetic repulsion part 1b, since closing | fastening operation is continued, it will cause re-closing as shown with a dotted line.

  In the case where the contact 44 is provided and no overcurrent is detected by the current detection circuit 47, the contact 44 is closed, so that the closing operation is continued, and the breaking portion 1a is closed by a normal operation. Can be made.

  According to the control circuit of the vacuum circuit breaker of the first embodiment, the contact circuit 44 that opens from the closed circuit when the electromagnetic repulsion circuit 24 operates is connected in series to the closing circuit 23 of the vacuum circuit breaker. Even if the electromagnetic repulsion circuit 24 is driven immediately after closing the blocking unit 1a of the device and the blocking unit 1a is immediately opened, the closing operation is interrupted to prevent reclosing of the blocking unit 1a, and the open state Can be held.

  Next, a control circuit of the vacuum interrupter according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 is a circuit diagram showing a closing circuit and a shut-off circuit of the control circuit of the vacuum interrupter according to Embodiment 2 of the present invention. The second embodiment is different from the first embodiment in that the storage location of the contact provided in the electromagnetic repulsion circuit is different. In FIG. 3, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 3, an electromagnetic repulsion housed in the operation mechanism portion 1c is provided with a contact 55 that opens when the fourth coil 50 is excited in a normally closed circuit connected in series to the second closing circuit 23. It is provided in the repulsion coil portion 24 b of the circuit 24. Further, the fourth coil 50 and the contact point 55 are connected by a control circuit using, for example, a photocoupler.

  According to the control circuit of the vacuum interrupter of the second embodiment, in addition to the same effect as that of the first embodiment, the contact 55 is accommodated in the operation mechanism portion 1c. Thus, the wiring work is facilitated and the control line can be prevented from induction of electromagnetic, electrostatic, etc. from the main circuit.

  Next, a control circuit of the vacuum interrupter according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 4 is a circuit diagram showing a closing circuit and a shut-off circuit of the control circuit of the vacuum interrupter according to Embodiment 3 of the present invention. The third embodiment is different from the first embodiment in that a contact provided in the electromagnetic repulsion circuit is operated by a repulsion coil. In FIG. 4, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, the repulsion coil portion 24b is provided with a contact 56 that opens when the repulsion coil 54 is excited in a normally closed circuit connected in series to the second closing circuit 23.

  According to the control circuit of the vacuum shut-off device of the third embodiment, in addition to the same effect as that of the first embodiment, the contact 56 is accommodated in the operation mechanism portion 1c. Becomes shorter and wiring work becomes easier.

The circuit diagram which shows the closing circuit and interruption | blocking circuit of the control circuit of the vacuum interruption | blocking apparatus which concern on Example 1 of this invention. The figure explaining operation | movement of each part by the control circuit of the vacuum interrupter concerning Example 1 of the present invention. The circuit diagram which shows the closing circuit and interruption | blocking circuit of the control circuit of the vacuum interruption | blocking apparatus concerning Example 2 of this invention. The circuit diagram which shows the closing circuit and interruption | blocking circuit of the control circuit of the vacuum interruption | blocking apparatus which concern on Example 3 of this invention. The figure which shows the structure of a vacuum interrupter.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Blocking part 1b Electromagnetic repulsion part 1c Operation mechanism part 2, 3 Electrode 4 Vacuum valve 5 Movable energizing shaft 6 Insulating operation rod 7 Movable operation shaft 8 Electromagnetic repulsion coil 9 Repulsion plate 10 Wipe spring 11 Closed coil 12 Opening coil 20 First interruption Circuit 21 First closing circuit 22 Second breaking circuit 22a, 23a Contact part 22b, 23b Relay part 23 Second closing circuit 24 Electromagnetic repulsion circuit 24a Detection part 24b Repulsion coil part 30 Opening coils 31, 33, 34, 36 , 38, 40, 41, 43, 44, 55, 56 Contact 32 Closed coil 35, 39, 45 Protection resistor 37 First coil 42 Second coil 46 Third coil 47 Current detection circuit 48 First trigger switch 49 Power supply 50 Fourth coil 51 Second trigger switch 52 Thyristor switch 53 Capacitor 54 Repulsion coil

Claims (3)

A breaking circuit that operates the operating mechanism to open a pair of electrodes that can be contacted and separated; and
A closing circuit that operates the operating mechanism to close the pair of electrodes;
Contacts connected in series to the input circuit;
An electromagnetic repulsion circuit having a repulsion coil that opens the pair of electrodes in a shorter time than the operation mechanism by electromagnetic repulsion;
When the electromagnetic repulsion circuit is driven while operating the closing circuit,
The control circuit for a vacuum interrupter, wherein the contact is changed from a closed circuit to an open circuit to interrupt a closing operation .   2. The control circuit for a vacuum interrupter according to claim 1, wherein the contact is operated when a current is detected by a current detection circuit of the electromagnetic repulsion circuit.   2. The control circuit for a vacuum interrupter according to claim 1, wherein the contact is operated when the repulsion coil is excited.

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