JP4890293B2 - Automatic switch - Google Patents

Description

  The present invention has a switch and a switch slave station and is installed on a distribution line. The switch includes a switch body, a delay opening circuit that delays opening of the switch body, and an operation circuit of the switch body. The switch slave station has a control power supply to which power is supplied from the distribution line, and relates to a normally excited automatic switch in which a control voltage obtained from the control power supply is supplied to the switch and the switch slave station. .

  In general, the switch is designed so that the short-circuit current cannot be cut off, and the ground-fault current can be cut off. With a normally-excited automatic switch, the control voltage supplied from the distribution line in the event of a short-circuit fault Is greatly reduced and the excited state cannot be maintained, and the switch body is opened in this state. To prevent this, the substation detects this accident and delays the opening of the switch body until the substation breaker trips and the distribution line becomes no voltage after a predetermined time has elapsed. Delaying the opening of the switch body in this way is described in Patent Document 1, for example.

  As shown in FIG. 8, in the conventional automatic switch, the switch 41 has a delay opening circuit 11 and a switch body for delaying the opening of the switch body 10 until the distribution line becomes non-voltage after a predetermined time has elapsed since the time of the short circuit accident. The operation circuit 12 is composed of 10 closing coils (closing coils) 12b and holding coils (holding coils) 12c, and the switch slave station 4 is provided with a control power source 21 to which power is supplied from a distribution line. The control voltage obtained from 21 is supplied to the switch 41 and the switch slave station 4.

  The delay release circuit 11 and the operation circuit 12 are functionally overlapped. As shown in the figure, between the output terminals of the control power supply 21, two diodes 12a1 and 12a2 connected in series are connected in series. Coil 12b and holding coil 12c are connected, a connection point between diodes 12a1 and 12a2 and a connection point between coils 12b and 12c are connected, and a normally closed closing contact 12d is connected between holding coils 12c. Has been. The closing contact is opened when the switch body 10 is closed. Here, it is assumed that the delay open circuit 11 is configured by the two diodes 12a1 and 12a2, and the operation circuit 12 is configured by the two coils 12b and 12c and the closing contact 12d.

  In such a configuration, first, a current flows through the closing coil 12b via the closing contact 12d and the switch body 10 is closed. When the switch body 10 is closed, the contact opens, so that a current also flows through the holding coil 12c. It becomes excited. Here, when the distribution line becomes non-voltage at the time of the short circuit accident, the energy accumulated in the closing coil 12b is released as a circulating current to the closed loop circuit of the diode 12a1 and this coil, and also accumulated in the holding coil 12c. Since energy is released as a circulating current to the closed loop circuit of the diode 12a2 and this coil, the opening of the switch body 10 is delayed by a predetermined time constant.

In the case of a ground fault, the control voltage does not decrease. However, as in the case of a short circuit accident, the switch body 10 is detected until the substation detects a ground fault and the substation breaker trips to no voltage. The delay of opening is delayed.

By the way, there is a request from the electric power company to reduce the power outage section at the time of the ground fault, and for that purpose, the ground fault is detected by the switch before the substation circuit breaker trips for the predetermined automatic switch. In addition, it is necessary to shut off at high speed without delay as described above.
JP-A-4-12420

  The conventional predetermined automatic switch has a problem that it is not designed to detect a ground fault with the switch before the substation circuit breaker trips and to shut off at high speed. In addition, there is a problem that it is necessary to prepare a system in which two different types of automatic switches corresponding to this and automatic switches only for delay opening are prepared.

  An object of the present invention is to provide an always-excited automatic switch in which a function of detecting a ground fault and quickly shutting it off is added to a predetermined automatic switch.

1st invention has a switch and a switch slave station, and is installed in a distribution line, and the switch is a switch side which delays opening of a switch body after a predetermined time from the time of a short circuit accident with a switch body A delay open circuit and an operation circuit of the switch body are provided, and the switch slave station is provided with a control power supply to which power is supplied from the distribution line, and a control voltage obtained from the control power supply is supplied to the switch and the switch slave station. This is intended for the normally excited automatic switch .

In the present invention, the switch is further provided with a switch-side manual switching means for manually switching the electrical connection state between the switch-side delay open circuit and the operation circuit, and a zero-phase current / zero-phase voltage detector. The switch slave station includes a slave station side delay release circuit, a first slave station side switch means for opening and closing an electrical connection state between the slave station side delay release circuit and the operation circuit, and a switch side delay release circuit; Second slave station side switching means that automatically opens and closes the electrical connection state with the control power source and the outputs of the zero-phase current / zero-phase voltage detector are inputted to the first and second slaves when a ground fault is judged. And a ground fault determination circuit for opening the station-side opening / closing means, and the switch-side manual opening / closing means is in an open circuit state .

The second invention is applied to the first invention. In the present invention, the switch is provided with through terminals respectively connected to the switch-side delay open circuit and the operation circuit. In addition, a short-circuit piece that is detachably attached to the outside of the switch and connected between both terminals is provided on the through-terminal connected to the switch-side delay open circuit and the operation circuit. Side manual opening / closing means is configured.

The third invention is applied to the first invention. In the present invention, the switch-side manual opening / closing means is constituted by a changeover switch with a handle which is provided on the switch and can be operated from the outside. .

The fourth invention is applied to the first invention. In the present invention, the switch-side delay open circuit is disposed outside the switch, and the switch-side manual switching means is operated in the switch. A through terminal connected to the circuit is provided, and the switch side delay open circuit is electrically connected to and disconnected from the operation terminal by attaching and detaching the switch side delay open circuit to the through terminal outside the switch. It is configured to be able to.

5th invention has a switch and a switch substation, and is installed in a distribution line, and the switch is a switch side which delays opening of a switch body after a predetermined time has passed since a short circuit accident with the switch body A delay open circuit and an operation circuit of the switch body are provided , and the switch slave station is provided with a control power supply to which power is supplied from the distribution line, and a control voltage obtained from the control power supply is supplied to the switch and the switch slave station This is intended for the normally excited automatic switch . In the present invention, the switch is further provided with a switch-side manual switching means for manually switching the electrical connection state between the switch-side delay open circuit and the operation circuit, and a zero-phase current / zero-phase voltage detector. The switch-side manual opening / closing means is in a closed state .

The sixth invention is applied to the fifth invention. In the present invention, the switch is provided with through terminals respectively connected to the switch-side delay open circuit and the operation circuit. In addition, a short-circuit piece that is detachably attached to the outside of the switch and connected between both terminals is provided on the through-terminal connected to the switch-side delay open circuit and the operation circuit. Side manual opening / closing means is configured.

The seventh invention is applied to the fifth invention. In the present invention, the switch-side manual opening / closing means is constituted by a changeover switch with a handle which is provided on the switch and can be operated from the outside.

The eighth invention is applied to the fifth invention. In the present invention, the switch-side delay open circuit is arranged outside the switch, and the switch-side manual switch means is an operating circuit in the switch. By connecting and disconnecting the switch-side delay release circuit and the operating circuit by attaching / detaching the switch-side delay release circuit to / from the through terminal outside the switch It is configured to be able to.

  As described above, according to the first to fourth inventions, a function of detecting a ground fault and quickly shutting off is added to a predetermined automatic switch, and switches of two types of automatic switches are provided. Therefore, it is possible to respond to the demand from the electric power company to reduce the power outage section at the time of the ground fault, and to easily correspond to the automatic switch that shuts off at high speed.

  According to the fifth aspect of the invention, since a function to detect a ground fault and to shut off at high speed is added to a predetermined automatic switch, from a power company that reduces the power outage section at the time of the ground fault Can respond to requests.

  According to the sixth to ninth inventions, since two types of automatic switches are made common, automatic switches other than predetermined automatic switches can be easily adapted to automatic switches that are only delayed open. Can be made. In addition, although it is not possible to respond to high-speed interruption at the time of a ground fault, if a ground fault is detected by the automatic switch and the situation is such that it is shut off at high speed, it is replaced with the switch slave station according to the present invention. By operating the switch according to the invention externally, it is possible to easily cope with high-speed disconnection in the event of a ground fault.

  FIG. 1A is a block circuit diagram showing a first embodiment of an automatic switch according to the present invention, and FIG. 1B is a circuit diagram of a main part of the switch. As shown in the figure, the automatic switch has a switch 1 and a switch slave station 2, and the switch 1 has a switch body 10, a switch-side delay open circuit 11, and an operation circuit 12 as in FIG. 8. Is provided. Further, a switch-side manual switching means 13 for manually switching the electrical connection state between the delay opening circuit 11 and the operation circuit 12 and a zero-phase current / zero-phase voltage detector 15 are provided. The switch-side manual opening / closing means 13 has through terminals 13b1 connected to the switch-side delay open circuit 11 and the operation circuit 12 so that detachable short-circuiting pieces 13a1, 13a2 to be connected outside the switch 1 are attached. , 13b2 are provided in the switch 1, and the short-circuit pieces 13a, 13a are not attached, that is, the connection is open. The through terminals 13b1 and 13b2 are provided, for example, at locations where the power supply line connecting the control power supply 21 and the diodes 12a1 and 12a2 is disconnected.

  The switch slave station 2 is provided with a control power supply 21 to which power is supplied from a distribution line, and a control voltage obtained from the control power supply is supplied to the switch 1 and the switch slave station 2. Furthermore, the slave station side delay open circuit 22, the first slave station side switch means 23 for opening and closing the electrical connection state of the slave station side delay open circuit 22 and the operation circuit 12, the switch 1 and the control power source 21 The second slave station side opening / closing means 24 for manually opening and closing the electrical connection state and the outputs of the zero-phase current / zero-phase voltage detector 15 are inputted to the first and second slave stations when a ground fault is judged. A ground fault determination circuit 25 for opening the side opening / closing means 23 and 24 is provided. The first and second slave station side opening / closing means 23, 24 are normally closed contacts. The slave station side delay release circuit 22 is composed of two diodes as in the delay release circuit 11.

  In such a configuration, since the operation circuit 12 and the slave station side delay open circuit 22 are connected via the closed first slave station side opening / closing means 23, as described above in the event of a short circuit accident, the predetermined circuit is used. The opening of the switch body 10 is delayed after a lapse of time. In addition, when a ground fault is detected by the ground fault determination circuit 25 at the time of a ground fault, the first and second slave station side opening / closing means 23 and 24 are opened. The delay release circuit 22 does not function and the control voltage is not instantaneously supplied from the control power supply 21 to the switch 1. Accordingly, since the excitation of the closing coil 12b and the holding coil 12c is released, the switch body 10 is shut off at high speed. As described above, the present embodiment makes it possible to respond to the request from the electric power company to reduce the power outage section at the time of the ground fault with respect to the predetermined automatic switch, and to easily correspond to the automatic switch that cuts off at high speed. .

  FIG. 2 is a block circuit diagram showing a second embodiment of the automatic switch according to the present invention. As shown in the figure, the automatic switch has a switch 1 and a switch slave station 2 having the same configuration as that in FIG. 1, and the switch 1 operates with a switch body 10 and a delay opening circuit 11 as in FIG. A circuit 12, a switch-side manual switching means 13, and a zero-phase current / zero-phase voltage detector 15 are provided. The switch-side manual opening / closing means 13 includes a changeover switch 13c with a handle that can be operated from the outside, for example, a rotary switch provided in the switch 1, and the switch is in the “OFF” state, that is, the connection is in the open state. ing. Thus, in this embodiment, it is possible to respond to the request from the electric power company to reduce the power outage section at the time of the ground fault, and to easily correspond to the automatic switch that shuts off at high speed.

  FIG. 3 is a block circuit diagram showing a third embodiment of the automatic switch according to the present invention. As shown in the figure, the automatic switch has a switch 1 and a switch slave station 2 having the same configuration as FIG. 1, and the switch 1 has a switch body 10, an operation circuit 12, and a switch as in FIG. A side manual opening / closing means 13 and a zero-phase current / zero-phase voltage detector 15 are provided. The switch-side manual opening / closing means 13 has a through-terminal 13d connected to the operation circuit 12 connected to the switch 1 so that the switch-side delay release circuit 11 is detachably connected outside the operation circuit 12 and the switch 1. The switch-side delay release circuit 11 is not attached, that is, the connection is open. Thus, in this embodiment, it is possible to respond to the request from the electric power company to reduce the power outage section at the time of the ground fault, and to easily correspond to the automatic switch that shuts off at high speed.

  FIG. 4 is a block circuit diagram showing a fourth embodiment of the automatic switch according to the present invention. As shown in the figure, the automatic switch has a switch 31 and a switch slave station 3, and the switch 31 has a switch body 10, a switch-side delay open circuit 11, and an operation circuit 12 as in FIG. 8. Is provided. Furthermore, a switch-side automatic switching means 14 for automatically switching the electrical connection state between the delay opening circuit 11 and the operation circuit 12 and a zero-phase current / zero-phase voltage detector 15 are provided. The switch-side automatic opening / closing means 14 comprises a normally closed contact.

  The switch slave station 3 includes a control power source 21 to which power is supplied from a distribution line, a slave station side automatic switch 24 that automatically opens and closes an electrical connection state between the control power source 21 and the switch 31, and a zero-phase current. A ground fault determination circuit 25 is provided that opens the switch-side automatic switching means 14 and the slave station side automatic switching means 24 when each output of the zero-phase voltage detector 15 is inputted and a ground fault is determined. The switch-side automatic switching means 14 and the slave station-side automatic switching means 24 are normally closed contacts.

  In such a configuration, since the switch-side delay open circuit 11 and the operation circuit 12 are connected via the closed switch-side automatic switching means 14, a predetermined time elapses as described above at the time of a short circuit accident. Later, opening of the switch body 10 is delayed. When the ground fault accident is determined by the ground fault determination circuit 25, the switch side automatic switching means 14 and the slave station side automatic switching means 24 are opened, so that the operation circuit 12 is delayed. As the circuit 11 does not function, the control voltage is not instantaneously supplied from the control power source 21 to the switch 31. Accordingly, since the excitation of the closing coil 12b and the holding coil 12c is released, the switch body 10 is shut off at high speed. Thus, this embodiment is made to respond to the request | requirement from the electric power company which reduces the power failure area at the time of a ground fault accident.

  FIG. 5 is a block circuit diagram showing a fifth embodiment of the automatic switch according to the present invention. As shown in the figure, the automatic switch has a switch 1 and a switch slave station 4 having the same configuration as that of FIG. 8, and the switch 1 has a switch body 10 and a switch-side delay open circuit as in FIG. 11, an operation circuit 12, a switch-side manual switching means 13, and a zero-phase current / zero-phase voltage detector 15 are provided. This switch-side manual opening / closing means 13 has through terminals 13b1, 13b2 connected to the delay opening circuit 11 and the operation circuit 12 so that detachable short-circuiting pieces 13a1, 13a2 to be connected outside the switch 1 are attached. The switch 1 is provided and configured, and the state where the short-circuit pieces 13a and 13a are attached, that is, the connection is closed. As described above, this embodiment can easily correspond to an automatic switch only for delay opening with respect to an automatic switch other than a predetermined automatic switch. In addition, when a ground fault is detected and a high-speed shut-off situation occurs, the switch slave station 2 according to the present invention is replaced, and the switch 1 is operated externally so that the high-speed shut-off at the time of a ground fault is achieved. Can be easily accommodated.

  FIG. 6 is a block circuit diagram showing a sixth embodiment of the automatic switch according to the present invention. As shown in the figure, the automatic switch has a switch 1 and a switch slave station 4 having the same configuration as FIG. 8, and the switch 1 has a switch body 10 and a delay opening circuit 11 as in FIG. An operation circuit 12, a switch-side manual switching means 13, and a zero-phase current / zero-phase voltage detector 15 are provided. The switch-side switch-side manual opening / closing means 13 is configured such that a switch 13c with a handle that can be operated from the outside is provided in the switch 1, and the switch is in the “on” state, that is, the connection is closed. . Thus, also in this embodiment, it is possible to easily correspond to an automatic switch that is only delayed open. In addition, when a ground fault is detected and a high-speed shut-off situation occurs, the switch slave station 2 according to the present invention is replaced, and the switch 1 is operated externally so that the high-speed shut-off at the time of a ground fault is achieved. Can be easily adapted to

  FIG. 7 is a block circuit diagram showing a seventh embodiment of the automatic switch according to the present invention. As shown in the figure, the automatic switch has a switch 1 and a switch slave station 4 having the same configuration as that of FIG. 8, and the switch 1 has a switch body 10 and a switch-side manual switch as in FIG. Means 13 and zero phase current / zero phase voltage detector 15 are provided. The switch-side manual opening / closing means 13 has a through-terminal 13d connected to the operation circuit 12 connected to the switch 1 so that the switch-side delay release circuit 11 is detachably connected outside the operation circuit 12 and the switch 1. The switch-side delay release circuit 11 is attached, that is, the connection is closed. Thus, also in this embodiment, it is possible to easily correspond to an automatic switch that is only delayed open. In addition, when a ground fault is detected and a high-speed shut-off situation occurs, the switch slave station 2 according to the present invention is replaced, and the switch 1 is operated externally so that the high-speed shut-off at the time of a ground fault is achieved. Can be easily accommodated.

  In the above embodiment, the operation circuit 12 is configured by the closing coil 12b and the holding coil 12c. However, the operation circuit 12 is not limited to this. For example, the diode 12a2 and the holding coil 12c in FIG. The through terminals 13b1 and 13b2 on the side may be eliminated, and a current limiting resistor instead of the holding coil 12c may be used.

(A) is a block circuit diagram which shows 1st Embodiment of the automatic switch which concerns on this invention, (B) is a circuit diagram of the principal part of a switch. It is a block circuit diagram which shows 2nd Embodiment of the automatic switch which concerns on this invention. It is a block circuit diagram which shows 3rd Embodiment of the automatic switch which concerns on this invention. It is a block circuit diagram which shows 4th Embodiment of the automatic switch which concerns on this invention. It is a block circuit diagram which shows 5th Embodiment of the automatic switch which concerns on this invention. It is a block circuit diagram which shows 6th Embodiment of the automatic switch which concerns on this invention. It is a block circuit diagram which shows 7th Embodiment of the automatic switch which concerns on this invention. (A) is a block circuit diagram showing a conventional automatic switch, and (B) is a circuit diagram of a main part of the switch.

DESCRIPTION OF SYMBOLS 1 Switch 2 Switch slave station 10 Switch body 11 Switch side delay open circuit 12 Operation circuit 21 Control power supply 13 Switch side manual switch means 15 Zero phase current / zero phase voltage detector 22 Slave station side delay open circuit 23 First slave station side opening / closing means 24 Second slave station side opening / closing means 25 Ground fault judgment circuit 13a1, 13a2 Short-circuiting piece 13b1, 13b2, 13d Through-terminal 13c Changeover switch with handle

Claims (8)

A switch-side delay opening circuit and a switch that delays the opening of the switch body after a predetermined time has elapsed from the time of the short circuit accident with the switch body. An operation circuit of the switch body, the switch slave station is provided with a control power source to which power is supplied from a distribution line, and a control voltage obtained from the control power source is constantly excited to be supplied to the switch and the switch slave station Type automatic switch,
The switch is further provided with a switch-side manual switching means for manually switching the electrical connection state between the switch-side delay open circuit and the operation circuit, and a zero-phase current / zero-phase voltage detector,
The switch slave station includes a slave station side delay release circuit, first slave station side switch means for opening and closing an electrical connection state between the slave station side delay release circuit and the operation circuit, and the switch side delay release circuit. A second slave station side opening / closing means for automatically opening and closing an electrical connection state between the circuit and the control power supply, and each output of the zero phase current / zero phase voltage detector being input to the first and And a ground fault determination circuit for opening the second slave station side opening / closing means,
An automatic switch in which the switch-side manual switching means is in an open state. A through terminal connected to each of the switch side delay open circuit and the operation circuit is provided in the switch,
A short-circuit piece that is detachably attached to the through terminals connected to the switch-side delay opening circuit and the operation circuit, respectively, is provided on the outside of the switch to connect the two terminals.
2. The automatic switch according to claim 1, wherein the switch side manual switching means is constituted by the through terminal and the short-circuit piece . 2. The automatic switch according to claim 1, wherein the switch-side manual opening / closing means includes a changeover switch with a handle that is provided on the switch and can be operated from the outside . The switch-side delay open circuit is disposed outside the switch ,
The switch-side manual switching means includes a through terminal connected to the operation circuit in the switch,
The switch-side delay release circuit and the operation circuit can be electrically connected to and disconnected from each other by attaching / detaching the switch-side delay release circuit to / from the through terminal outside the switch. automatic switch according to claim 1, which is. A switch-side delay opening circuit and a switch that delays the opening of the switch body after a predetermined time has elapsed from the time of the short circuit accident with the switch body. An operation circuit of the switch body, the switch slave station is provided with a control power source to which power is supplied from a distribution line, and a control voltage obtained from the control power source is constantly excited to be supplied to the switch and the switch slave station Type automatic switch,
The switch is further provided with a switch-side manual switching means for manually switching the electrical connection state between the switch-side delay open circuit and the operation circuit, and a zero-phase current / zero-phase voltage detector. Automatic switch with the manual side open / close means closed . A through terminal connected to each of the switch side delay open circuit and the operation circuit is provided in the switch,
A short-circuit piece that is detachably attached to the through terminals connected to the switch-side delay opening circuit and the operation circuit, respectively, is provided on the outside of the switch to connect the two terminals.
6. The automatic switch according to claim 5 , wherein the switch-side manual switching means is constituted by the through terminal and the short-circuit piece . The automatic switch according to claim 5 , wherein the switch-side manual switching means includes a changeover switch with a handle that is provided on the switch and can be operated from the outside . The switch-side delay open circuit is disposed outside the switch ,
The switch-side manual switching means includes a through terminal connected to the operation circuit in the switch,
The switch-side delay release circuit and the operation circuit can be electrically connected to and disconnected from each other by attaching / detaching the switch-side delay release circuit to / from the through terminal outside the switch. automatic switch according to claim 5 being.

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