JPH0984281A - Circuit breaker controller for cubicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To notify the loss of power supply, required for the following operation of a circuit breaker, surely to an operator by lighting a red lamp indicating the closed state of circuit breaker with a power supply for the trip circuit of a circuit breaker and lighting a green lamp indicating the open state of the circuit breaker with a power supply for the closing circuit of the circuit breaker. SOLUTION: When the close command switch 15 of an external operating circuit 20A is turned on, a red lamp 26 indicating the closed state of the circuit breaker in the external operating circuit 20A and a red indicating lamp 32 on the surface of switchboard are lighted with a power supply for the trip circuit of the circuit breaker through an a-contact 29 closing upon closure of the circuit breaker and a trip coil 30 for opening the circuit breaker. When an open command switch 52 of the external operating circuit 20A is closed to disconnect the circuit breaker, a green lamp 27 indicating the open state of the circuit breaker in the external operating circuit 20A and a green lamp 35 on the surface of the switchboard are lighted with a power supply for the closing the circuit breaker through a b-contact 34. An operator can confirm the open/close state of the circuit breaker and when an indicating light is not lighted, loss of power supply required for following operation is confirmed and dealt with quickly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a monitoring function of a control power source of a vacuum circuit breaker housed in a high voltage closed switchboard of a thermal power plant or a nuclear power plant or an air circuit breaker housed in a low voltage closed switchboard. And a circuit breaker control circuit for a closed switchboard.

[0002]

2. Description of the Related Art Generally, a main power supply system in a thermal power plant or a nuclear power plant has a high-voltage closed switchboard for accommodating high-voltage power by accommodating a vacuum circuit breaker, etc. A low voltage closed switchboard housing an air circuit breaker is provided for the purpose of distributing the power supplied via the transformer. FIG. 5 is a schematic configuration diagram of this type of main power supply system in a plant. In the figure, 1 is a generator, most of the generated power is transmitted to the external power system 3 via the main transformer 2, and part of the generated power is transmitted via the in-house transformer 4a to the auxiliary machinery of the in-house motor. Be distributed to. A high voltage closed switchboard 10 is provided for power distribution to the auxiliary electric motors in the plant. The high-voltage closed switchboard 10 includes a power receiving breaker 10a provided in a system for receiving power from the on-site transformer 4a.
And a power receiving circuit breaker 10b provided in a system that receives power from the external power system 3 as a backup power source through a step-down transformer (also referred to as a start-up transformer or a backup transformer), and a subsidiary auxiliary motor. Distribution breaker installed in the grid
10L1 to 10Ln are stored.

During normal operation of the power plant, the power breaker 10a is closed and the power breaker 10b is open. When the power receiving circuit breaker 10a is in the open state, the power receiving circuit breaker 10b is closed by a control circuit (not shown), so that electric power is supplied to the auxiliary electric motors in the station. Power receiving circuit breakers 10a and 10b housed in the high-voltage closed switchboard 10 and circuit breakers for distribution
Each of 10L1 to 10Ln is provided with a circuit breaker control circuit for making and breaking control, and these circuit breaker control circuits are operated by a control power source in a power plant (not shown).

FIG. 6 shows an example of the structure of a circuit breaker control circuit. In the figure, the circuit breaker control circuit 11 is an isolator 11P and
Equipped with 11N. The power split isolators 12p and 22P in the circuit breaker are connected to the load side of the isolator 11P.
The power supply split isolators 12N and 22N in the circuit breaker are also connected to the load side of the isolator 11N. The circuit breaker closing circuit 13 includes a power circuit and a closing command circuit. The negative side terminals of the power circuit and the closing command circuit are connected to the wiring 19 derived from the load side of the power supply split isolator 12N. The positive terminal of the power circuit is connected to the load side of the power split isolator 12P.

The circuit breaker control circuit 11 includes an external operation circuit 20. The external operation circuit 20 includes a closing command switch 15, an opening command switch 25, a closing state display red light 26, and an opening state display green light 27. Cables 14 and 16 are pulled out from the closing command switch 15 of the external operation circuit 20, the tip of the cable 14 is connected to the load side of the power split isolator 12P, and the tip of the cable 16 is from a control circuit (not shown) in the circuit breaker. Opens when a closing prohibition command is output b
Connected to the positive terminal of the closing command circuit via contact 17 and b contact 18 that is closed when the control circuit (not shown) in the breaker detects that the circuit breaker is not closed. Has been done.

On the other hand, the wiring 23 led out from the load side of the power supply division isolator 22P and the power supply division isolator 22
The wiring 31 led out from the load side of N 3 supplies the operating power of the circuit breaker trip circuit. The open command switch 25 of the external operation circuit 20 and the circuit breaker closing status display red light 26 are connected in parallel, and the cable 24 is connected from one parallel connection end.
Is pulled out and its tip is connected to the wiring 23, and the cable 28 is pulled out from the other parallel connection end, and its tip is detected by a control circuit (not shown) in the circuit breaker that the circuit breaker is closed. A contact 29 that closes when
And wiring via the trip coil 30 for opening the circuit breaker
Connected to 31. The cable for the a contact 29
A red light 32 for indicating the breaker closing state is connected between the connection point of 28 and the wiring 23. Further, one of the parallel connection ends of the opening command switch 25 and the closing state display red light 26 is further connected to one end of a circuit breaker opening state display green light 27,
The cable 33 is pulled out from the other end of the open-state display green light 27, and its tip closes when the control circuit (not shown) in the circuit breaker detects that the circuit breaker is in the open state. It is connected to the wiring 31 via the b-contact 34 which is open. A circuit breaker open state display green lamp 35 is connected between the connection point of the cable 33 to the b-contact 34 and the wiring 23.

The above is an example of a circuit breaker control circuit corresponding to one circuit breaker. Basically, the circuit breaker control circuit uses a control power source (a DC power source in this example) installed in a power plant (not shown). Each circuit breaker housed in the switchboard is divided by the power split isolator 11P, 11N, 12P, 12N, 22P, 22N.

In such a configuration, if the power-supply split isolators 11P, 11N, 12P, 12N, 22P, 22N are all in the on state, the circuit breaker is closed by turning on the closing command switch 15. If the circuit breaker is closed, the red lights 26 and 32 for indicating the closing state are turned on, and the green lights 27 and 35 for indicating the open state are turned off. Here, if the opening command switch 25 is turned on, the breaker is opened. While opening the circuit breaker,
The red lights 26 and 32 for indicating the closing state are turned off, and the green lights 27 and 35 for indicating the open state are turned on.

[0009]

In the circuit breaker control circuit described above, when the power supply isolation isolators are forgotten to be restored after the circuit breaker is inspected or the isolator itself becomes unsuitable, the control power cannot be supplied. It is possible that automatic operation of the circuit breaker will be disabled. As shown in FIG. 5, a route for distributing electric power from the generator 1 to the site,
That is, when a power loss accident occurs in the path including the on-site transformer 4a and the power receiving circuit breaker 10a, the power receiving circuit breaker 10b is automatically turned on, and the external power system 3 serving as a backup power source passes through the step-down transformer 4b. This includes the possibility that the power receiving circuit breaker 10b cannot be automatically turned on in the event of a power loss of this type in which power is supplied but control power cannot be supplied to the switchboard.

Therefore, managing the isolator for splitting the power source and the control power source for each circuit breaker is one of the important work items for the power plant operator, and the load on the power plant operator increases accordingly. There was a problem.

The present invention has been made to solve the above-mentioned problems, and it is possible to easily grasp whether or not the power supply for controlling the circuit breaker has fallen into an inoperable state, whereby the circuit breaker can be easily operated. An object of the present invention is to provide a circuit breaker control circuit for a closed switchboard, which can reduce the burden on an operator for maintaining the soundness of a control power supply.

[0012]

As is well known, the operation of a circuit breaker is either closing or opening. When the circuit breaker is opened, a red light for displaying the breaker closing state is turned on, and when it is opened, a circuit breaker opening state is displayed. Turn on the green light. On the other hand, in the case of a closed switchboard in which the circuit breaker closing circuit power is turned on and the circuit breaker trip circuit power is tripped, the red light for displaying the circuit breaker closing state is conventionally provided only by the circuit breaker closing circuit power. Was lit, or the green light for displaying the circuit breaker open status was lit. With such a configuration, even if the circuit breaker closing circuit power source is inoperable when the circuit breaker is opened, the operator cannot grasp the state. Therefore, according to the present invention, the circuit breaker closing state display red light is turned on by the circuit breaker trip circuit power source, and conversely, the circuit breaker open state display green lamp is turned on by the circuit breaker closing circuit power source. In this way, when the power supply required for the next operation of the circuit breaker becomes unusable, the indicator light which should be in the lighted state is turned off and the operator can be informed of the state.

Another aspect of the invention is to monitor the loss of the divided power sources by a closing circuit power source monitoring relay and a trip circuit power source monitoring relay, respectively, and control when at least one of them is inoperative. A control power loss unit detection circuit that outputs a power loss signal and an alarm / display circuit that generates an alarm in response to this control power loss signal and notifies the operator of the power plant that there was a loss of control power. With this, the operator can more quickly recognize that the power supply for circuit breaker control has fallen into an inoperable state.

Another aspect of the present invention uses a wiring breaker with auxiliary contacts to divide a control power supply into a power supply for a circuit breaker closing circuit and a power supply for a circuit breaker trip circuit, and these auxiliary contacts are used. A control power loss unit detection circuit that outputs a control power loss signal when at least one of the signals corresponds to the inoperability of the circuit breaker for wiring, and an alarm is generated in response to the control power loss signal, It is equipped with an alarm / display circuit that informs the operator of the power plant that there has been a loss of control power, so that it has the same function as when a power supply monitoring relay is provided. .

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail based on preferred embodiments. FIG. 1 is a circuit diagram showing a first embodiment of the present invention, in which FIG.
Those denoted by the same reference numerals as in the above indicate the same elements. This device corresponds to the circuit breaker control circuit 11 shown in FIG. 6 and includes a circuit breaker control circuit 11A as an external operation circuit.
It is equipped with an external operation circuit 20A corresponding to 20. The circuit breaker control circuit 11 and the circuit breaker control circuit 11A have different connection power paths of the green lamp 35 for open status display, and the external operation circuit 20 and the external operation circuit 20A are different from each other for the green light 27 for open status display. The connection power path is different. Here, the configuration of the conventional device that is different from the configuration will be described.

One end of the green lamp 27 for displaying the open state is connected to the power split isolator 12 in order to connect the closing command switch 15.
It is connected to the cable derived from the load side of P,
The other end of the open state display green light 27 is connected to one end of the b contact 34 by a cable 33. Also, b contact 34
The other end of the power split isolator 12
It is connected to the wiring 19 derived from the load side of N. On the other hand, a new cable 36 is led out from the load side of the power supply split isolator 12P, one end of the open state display green light 35 is connected to the tip of this cable 36, and the other end of this open state display green light 35 is connected to the cable. It is connected to the connection point of the b contact 34 with respect to 33.

The operation of the first embodiment configured as described above will be described below. First, the external operation circuit 20
When the circuit breaker is turned on by turning on the closing command switch 15 of A, as described in the conventional device, the a contact 29 that closes when the circuit breaker is closed and the trip coil 30 that opens the circuit breaker. Via the external operation circuit 20
The red light 26 for displaying the breaker closing state in A and the red light 32 for displaying the breaker closing state on the surface of the switchboard are turned on by the power supply for the breaker trip circuit. The operator of the power plant can confirm that the circuit breaker is in the closed state by turning on the red light 26 or 32 for displaying the circuit breaker closing state, and the red light 26 or 32 for displaying the circuit breaker closing state lights up. If not, it is possible to grasp the possibility that the power supply for the circuit breaker trip circuit, which is required for the next operation of the circuit breaker that has been turned on, has become inoperable for some reason, and the A health check can be conducted.

Next, when the circuit breaker is opened by turning on the open command switch 25 of the external operation circuit 20A, the external operation circuit 20A is opened via the b contact which is closed in the open state of the circuit breaker. Green light for open circuit breaker
27 and the green light 35 for displaying the breaker open state on the panel surface of the switchboard are turned on by the power supply for the breaker closing circuit. The operator of the power plant can confirm that the circuit breaker is open by turning on the green light 27 or 35 for displaying the circuit breaker open state.
Or, if 35 is not lit, it can be understood that the power supply for the circuit breaker closing circuit, which is required for the next operation of the opened circuit breaker, has become inoperable for some reason. It is possible to conduct a soundness survey of the power source.

Thus, according to the first embodiment, the red indicator light which is turned on by turning on the circuit breaker is turned on by the power source for the circuit breaker trip circuit, and the green indicator lamp which is turned on by turning off the circuit breaker is provided. If the power supply required for the next operation of the circuit breaker becomes unusable by lighting it with the power supply for the circuit breaker closing circuit, turn off the indicator light that should be on and let the operator know the state. As a result, the burden on the operator for maintaining the soundness of the power supply for controlling the circuit breaker can be reduced.

FIG. 2 is a circuit diagram showing a schematic configuration of a second embodiment of the present invention, and FIG. 3 is a control power supply monitoring circuit diagram attached to this embodiment. In the figure, the same elements as those in FIG. 6 showing the conventional device are denoted by the same reference numerals, and the description thereof will be omitted. This device includes a circuit breaker control circuit 11B corresponding to the circuit breaker control circuit 11 shown in FIG. The circuit breaker control circuit 11B newly connects a circuit breaker closing circuit power supply monitoring relay 40 between the load side of the power supply split isolator 12P and the load side of the power supply split isolator 12N, and connects the load side of the power supply split isolator 22P to the power supply. The configuration is different from the circuit breaker control circuit 11 in that a circuit breaker trip circuit power supply monitoring relay 41 is newly connected between the split isolator 22N and the load side. Further, the control power supply monitoring circuit of FIG. 3 is provided according to the addition of these power supply monitoring relays.

A circuit breaker closing circuit power supply monitoring relay 40 and a circuit breaker trip circuit power supply monitoring relay 41 are provided for each circuit breaker unit, and the control power supply monitoring circuit shown in FIG. 3 has a plurality of circuit breaker units. It is configured to collectively monitor closed switchboards. Now, when the circuit breaker closing circuit power supply monitoring relay 40 provided for each circuit breaker unit in one closed switchboard does not operate, the closing circuit power loss signals 42C, 43C, ... The circuit power supply monitoring relay 41 also outputs the tripping circuit power supply loss signals 42T, 43T, ..., 49T when the relay 41 is not operating. These signals are input to control power loss unit detection circuits 50a, 50b, ..., 50n configured by OR circuits.
That is, the closing circuit power loss signal 42C is input as one input of the control power loss unit detection circuit 50a, and the trip circuit power loss signal 42T is input as the other input, and the closing circuit power loss signal 42C is input as one input of the control power loss unit detection circuit 50b. Loss signal 43C is input as trip circuit power loss signal 43T as the other input, ..., Control power loss unit detection circuit 50n Input circuit power loss signal 49C as one input and trip circuit power loss signal as the other input 49
T is input respectively.

Control power loss unit detection circuit 50a, 50b
, ..., 50n are connected to display circuits 51a, 51b, ..., 51n for displaying the control power loss breaker unit. Also, the control power loss unit detection circuit 50a
, 50b, ..., 50n outputs are input to the control power loss distribution panel discriminating circuit 53 constituted by an OR circuit. The control power loss switchboard signal 54a output from the control power loss switchboard determination circuit 53 generates an alarm and an alarm / display circuit 55 for transmitting the information to the operator of the power plant.
Entered in a.

The configuration of the control power supply monitoring circuit provided corresponding to one switchboard 60a has been described above, but the same power supply monitoring relays corresponding to the other switchboards 60b, 60c, ..., 60n, A control power loss unit detection circuit and a control power loss switchboard determination circuit (not shown) are provided, and each control power loss switchboard signal 54b, 54c, ..., 54n is input to the alarm / display circuits 55b, 55c, ..., 55n. It is configured to.

The operation of the second embodiment configured as described above will be described below. First, if the circuit power for the circuit breaker is lost, the circuit power monitoring relay
40 operates, and the closing circuit power loss signal 42c is output.
The closing circuit power loss signal 42c is input to the control power loss unit detection circuit 50b, and the control power loss unit detection circuit 50b outputs the control power loss signal. In response to this output, the display circuit 51a displays the control power loss breaker. Also, the control power loss signal is input to the control power loss switchboard determination circuit 53, and the control power loss switchboard determination circuit 53
The control power loss switchboard signal 54a is output from the control power supply, and the information is transmitted to the operator of the power plant by the alarm / display circuit 55a.

Next, when the trip circuit power supply of the circuit breaker is lost, the trip circuit power supply monitoring relay 41 is operated, and the trip circuit power supply loss signal 42T is output. The trip circuit power loss signal 42T is the control power loss unit detection circuit 50b.
The control power loss unit detection circuit 50b outputs a control power loss signal. In response to this output, the display circuit 51a displays the control power loss breaker. Also,
The control power loss signal is input to the control power loss switchboard discrimination circuit 53, the control power loss switchboard determination circuit 53 outputs the control power loss switchboard signal 54a, and the alarm / display circuit 55a informs the operator of the information. Transmitted.

As a result, the operator of the power plant is in the inoperable state and the inoperable state of the power supply for the circuit breaker control circuit due to the information of the alarm / display circuit 55a and the information of the display circuit 51a. You can easily grasp the circuit breaker unit
Work for maintaining the soundness of the control power source for the circuit breaker can be performed. In addition, other switchboards 60b, 60c
,…, 60n, the same monitoring is performed,
According to the alarm, work for maintaining the soundness of the control power supply can be performed.

Thus, according to the second embodiment, the circuit breaker closing circuit power supply and the circuit breaker trip circuit power supply that are divided are individually monitored, and the circuit breaker unit that has lost the power supply, and this unit. Since the closed switchboard including the power supply is identified, the operator of the power plant can more quickly and easily know that the power supply for the circuit breaker control circuit has fallen into an inoperable state. It is possible to reduce the burden on the operator for maintaining the above.

FIG. 4 is a circuit diagram showing the configuration of the third embodiment of the present invention. In the figure, the same elements as those in FIG. 6 showing the conventional device are denoted by the same reference numerals, and the description thereof will be omitted. This device is equipped with a circuit breaker control circuit 11C corresponding to the circuit breaker control circuit 11 shown in FIG. Circuit breaker control circuit
11C uses wiring breakers 12PA and 12NA with auxiliary contacts instead of the power split isolators 12P and 12N in FIG. 6, and at the same time, instead of the power split isolators 22P and 22N, wiring breakers 22PA with auxiliary contacts. , 22NA is different from the circuit breaker control circuit 11 in configuration.

In this case, an auxiliary contact signal corresponding to the non-operation of the circuit breakers 12PA and 12NA for wiring is input to an OR circuit (not shown), and the output of this OR circuit is used as the closing circuit power loss signal 42c. The ON operation signal of the auxiliary contact corresponding to the non-operation of the circuit breakers 22PA and 22NA is input to an OR circuit (not shown), the output of this OR circuit is tripped, and the circuit power loss signal 42T.
The control power supply shown in FIG. 3 is configured to be input to the monitoring circuit. As a result, FIG.
Also, the same monitoring as described with reference to FIG. 3 and the work for maintaining the soundness of the control power supply can be performed based on this monitoring.

[0030]

As is clear from the above description, according to the present invention, the circuit breaker closing state display red light is turned on by the circuit breaker trip circuit power source, and conversely, the circuit breaker open state display green light is emitted. Since the lamp is lit by the power supply for the circuit breaker closing circuit, if the power supply required for the next operation of the circuit breaker becomes unusable, the indicator lamp that should be in the lighting state is turned off and the operator is in that state. Can be grasped, and by this, the burden on the operator for maintaining the soundness of the power source for circuit breaker control can be reduced.

According to another aspect of the present invention, the loss of the divided power supplies is monitored by the closing circuit power supply monitoring relay and the tripping circuit power supply monitoring relay, respectively, and at least one of them is inoperative. , The alarm is generated and the operator of the power plant is notified of the loss of the control power supply, so that the operator can know more quickly that the power supply for circuit breaker control has become inoperable. it can.

According to another aspect of the invention, a wiring breaker with auxiliary contacts is used to divide the control power supply, and at least one of these auxiliary contact signals corresponds to the non-operation of the wiring breaker. If the power source is an alarm, an alarm is generated and the operator of the power plant is notified of the loss of the control power source. Therefore, the same operation and effect as in the case where the power source monitoring relay is provided can be obtained.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a schematic configuration of a second embodiment of the present invention.

FIG. 3 is a diagram showing a control power supply monitoring circuit that monitors the control power supplies of a plurality of closed switchboards in combination with the embodiment shown in FIG.

FIG. 4 is a circuit diagram showing a schematic configuration of a third embodiment of the present invention.

FIG. 5 is a main power supply system diagram in a power plant including a closed switchboard to which the present invention is applied.

FIG. 6 is a circuit diagram showing a configuration of a circuit breaker control circuit of a conventional closed switchboard.

[Explanation of symbols]

10 High-voltage closed switchboard 10a, 10b Power receiving circuit breaker 11A, 11B, 11C Circuit breaker control circuit 11P, 11N, 12P, 12N, 22P, 22N Split power isolator 12PA, 12NA Wiring circuit breaker 13 Circuit breaker closing circuit 20, 20A External operation circuit 26, 32 Red light for turning-on state display 27, 35 Green light for opening state 30 Trip coil 50a, 50b to 50n Control power loss unit detection circuit 53 Control power loss switchboard discrimination circuit 55a, 55b to 55n Alarm / display circuit

Claims (3)

[Claims] 1. To control a circuit breaker, one control power source is divided into a circuit breaker closing circuit power source and a circuit breaker trip circuit power source, and the circuit breaker closing circuit power source turns on the circuit breaker. In the circuit breaker control circuit of the closed switchboard for tripping the circuit breaker by the circuit breaker trip circuit power supply, when the circuit breaker is closed, power is supplied from the circuit breaker trip circuit power supply and the circuit breaker is in a closed state. A circuit breaker closing status display red light, and a circuit breaker opening status display green light that is supplied with power from the circuit breaker closing circuit power supply to display the circuit breaker opening status when the circuit breaker is opened. A circuit breaker control circuit for a closed switchboard, characterized by being provided. 2. To control a circuit breaker, one control power supply is divided into a circuit breaker closing circuit power supply and a circuit breaker trip circuit power supply, and the circuit breaker closing circuit power supply turns on the circuit breaker. In the circuit breaker control circuit of the closed switchboard for tripping the circuit breaker by the circuit breaker trip circuit power supply, a closing circuit power supply monitoring relay operably connected by the circuit breaker closing circuit power supply, and the cutoff The trip circuit power supply monitoring relay operably connected by the power supply for the trip circuit power supply, the contact signal of the closing circuit power supply monitoring relay and the contact signal of the trip circuit power supply monitoring relay are input, and these When at least one of the contact signals corresponds to a non-operation, a control power loss unit detection circuit that outputs a control power loss signal, and an alarm in response to the control power loss signal A circuit breaker control circuit for a closed switchboard, which is equipped with an alarm / display circuit that notifies the operator of the power plant of the occurrence of the loss of control power when it occurs. 3. To control a circuit breaker, one control power source is divided into a power source for a circuit breaker closing circuit and a power source for a circuit breaker trip circuit, and the circuit breaker is turned on by the circuit breaker closing circuit power source. In the circuit breaker control circuit of the closed switchboard for tripping the circuit breaker by the circuit breaker trip circuit power source, the control power source is divided into a circuit breaker closing circuit power source and a circuit breaker trip circuit power source. A circuit breaker with auxiliary contacts, and inputting each auxiliary contact signal of the circuit breaker, and when at least one of these auxiliary contact signals corresponds to a non-operation of the circuit breaker, control A control power loss unit detection circuit that outputs a power loss signal, and an alarm / display circuit that generates an alarm in response to the control power loss signal and notifies the operator of the power plant that there is a loss of control power Breaker control circuit of the closed switchboard, characterized in that it comprises a.