CN110739179A - A substation circuit breaker control circuit and its monitoring method - Google Patents

Abstract

The invention discloses a substation circuit breaker control loop and a monitoring method thereof. The trip control loop and/or the closing control loop are connected between the positive pole of the operating power supply and the negative pole of the operating power supply, and the tripping control loop and/or the closing control loop are connected in parallel. Between the positive pole of the operating power supply and the negative pole of the operating power supply. The OPT1, OPT2, OPT3, OPT4 optocoupler loops on the control loop sense the correctness of the action of the detection contacts of the relay, and the HWJ optocoupler loop and the TWJ optocoupler loop sense the electrical integrity of the relay control loop. The invention ensures that the entire control loop can act correctly when needed, and realizes the state maintenance of the entire control loop.

Description

A substation circuit breaker control circuit and its monitoring method

technical field

The invention relates to a substation circuit breaker control circuit and a monitoring method thereof, belonging to the technical field of substation operation and maintenance.

Background technique

Whether the connection of various control circuits in the substation is normal or not directly affects whether the electrical equipment in the substation can work safely and reliably, and is an important part of the safe and stable operation of the substation. In general, operation and maintenance personnel inspect or repair various control circuits (maintenance, debugging, and testing) in combination with the maintenance period stipulated by the electrical equipment of the power system and an equipment outage plan, and the cycle is a fixed one-year or Several years, also known as regular maintenance.

With the continuous development of the power grid, the scale of the substation is expanding day by day, and the workload brought by regular maintenance has become a heavy burden for the operation and maintenance personnel of the substation. In recent years, the State Grid Corporation of China proposed the mode of condition maintenance, that is, the equipment first evaluates its own health status in real time, and then arranges maintenance work when it is determined that the circuit is abnormal or faulty. Condition-based maintenance enables maintenance personnel or experts to quickly predict the future state of the equipment based on the previous and current status of the equipment, and decide whether it should be repaired, when it should be repaired, and where to repair it.

The circuit breaker is an important primary equipment in the substation. When the system fails, the protection equipment and the intelligent terminal work together to complete the control of the circuit breaker, which can quickly cut off the fault current, prevent the accident from expanding, and ensure the stable operation of the entire power system. . Among them, the circuit breaker tripping and closing control loop is the core of controlling the normal operation of the circuit breaker, and its maintenance work is also an extremely important work.

At present, due to the lack of online real-time monitoring mode for circuit breakers and their tripping and closing control loops, circuit breaker maintenance mainly relies on regular maintenance mode, which also brings huge workload to on-site operation and maintenance personnel. The online monitoring of the circuit breaker tripping and closing control loop without blind spot is of great significance to the real realization of the state maintenance of the circuit breaker.

SUMMARY OF THE INVENTION

Purpose: In order to overcome the deficiencies in the prior art, the present invention provides a substation circuit breaker control loop and a monitoring method thereof, which can monitor the integrity and correctness of the control loop at the same time, and realize rapid state maintenance of the entire control loop .

Technical scheme: in order to solve the above-mentioned technical problems, the technical scheme adopted in the present invention is:

A substation circuit breaker control loop, comprising: a trip control loop and/or a closing control loop, the trip control loop is connected between the positive pole of an operating power supply and the negative pole of the operating power supply, and the trip control loop is used to control the tripping of the substation circuit breaker , the tripping control loop is connected in parallel with the tripping monitoring loop, and the tripping monitoring loop is used to monitor the working state of the switch node in the tripping control loop; the closing control loop is connected between the positive pole of the operating power supply and the negative pole of the operating power supply, and the closing control loop The circuit is used to control the closing of the substation circuit breaker, the closing control circuit is connected in parallel with the closing monitoring circuit, and the closing monitoring circuit is used to monitor the working state of the switch nodes in the closing control circuit.

As a preferred solution, the trip control loop includes: the first contact J1 of the trip relay, the second contact J2 of the trip relay, the first contact J1 and the second contact J2 and the trip pressure plate, the trip holding coil TBJ, the internal contact of the circuit breaker DL1 and the trip coil are connected in series; the contact TBJA of the trip hold coil TBJ is connected in parallel between the positive pole of the operating power supply and the common point of the trip pressure plate and the trip hold coil TBJ; the trip monitoring circuit includes: OPT1 optocoupler circuit, OPT2 optocoupler circuit, OPT1 The optocoupler circuit is connected in parallel between the positive pole of the operating power supply and the common point of the first contact J1 and the second contact J2; the OPT2 optocoupler circuit is connected in parallel between the common point of the first contact J1 and the second contact J2 and the common point of the trip pressure plate and the trip holding coil TBJ between.

As a preferred solution, a TWJ optocoupler loop is also included, and the TWJ optocoupler loop is connected in parallel between the positive pole of the operating power supply and the common point of the trip pressure plate and the trip holding coil TBJ.

As a preferred solution, when the current in the OPT1 optocoupler circuit and the OPT2 optocoupler circuit is greater than the threshold, the indicator lights in the OPT1 optocoupler circuit and the OPT2 optocoupler circuit are on, and the signal is set to 1; when the current is less than the threshold, the OPT1 optocoupler circuit, OPT2 optocoupler circuit. The indicator light in the coupling loop is off, and the signal is set to 0; the threshold value is greater than the series current of the OPT1 optocoupler loop and the OPT2 optocoupler loop, and less than the smaller value of the two separate conduction currents of the OPT1 optocoupler loop and the OPT2 optocoupler loop.

As a preferred solution, the TWJ optocoupler circuit is turned on, the indicator light in the TWJ optocoupler circuit is on, and the signal is set to 1;

As a preferred solution, the closing control circuit includes: the third contact J3 of the closing relay, the fourth contact J4 of the closing relay, the third contact J3 and the fourth contact J4 and the closing pressure plate, the closing holding coil HBJ, The internal contact DL2 of the circuit breaker and the closing coil are connected in series; the contact HBJA of the closing holding coil HBJ is connected in parallel between the positive pole of the operating power supply and the closing pressure plate and the common point of the closing holding coil HBJ; the closing monitoring circuit includes: OPT3 Optocoupler loop, OPT4 optocoupler loop, OPT3 optocoupler loop is connected in parallel between the positive pole of the operating power supply and the common point of the third contact J3 and fourth contact J4; OPT4 optocoupler loop is connected in parallel with the third contact J3 and the fourth contact J4 common point Between the closing pressure plate and the common point of the closing holding coil HBJ.

As a preferred solution, the HWJ optocoupler loop is also included, and the HWJ optocoupler loop is connected in parallel between the positive pole of the operating power supply, the closing pressure plate, and the common point of the closing holding coil HBJ.

As a preferred solution, when the current in the OPT3 optocoupler circuit and the OPT4 optocoupler circuit is greater than the threshold, the indicator lights in the OPT3 optocoupler circuit and the OPT4 optocoupler circuit are on, and the signal is set to 1; when the current is less than the threshold, the OPT3 optocoupler circuit, OPT4 optocoupler circuit. The indicator light in the coupling loop is off, and the signal is set to 0; the threshold value is greater than the series current of the OPT3 optocoupler loop and the OPT4 optocoupler loop, and less than the smaller value of the two separate conduction currents of the OPT3 optocoupler loop and the OPT4 optocoupler loop.

As a preferred solution, the HWJ optocoupler circuit is turned on, the indicator light in the HWJ optocoupler circuit is on, and the signal is set to 1;

A method for monitoring a control loop of a circuit breaker in a substation, comprising: monitoring a tripping control loop and/or monitoring a closing control loop, controlling the open and closed states of a switch node in the trip control loop, and judging the switch node according to the light on and off of an optocoupler loop indicator light , the working state of the optocoupler circuit; control the opening and closing state of the switch node in the closing control loop, and judge the working state of the switch node and the optocoupler circuit according to the light on and off of the optocoupler circuit indicator.

As a preferred solution, the control command is that both the first contact J1 and the second contact J2 are disconnected: when the OPT1 optocoupler circuit and OPT2 optocoupler circuit signals are both 0, the first contact J1 and the second contact J2 are output normally; The coupling circuit signal is 0, the OPT2 optocoupler circuit signal is 1, and the output first contact J1 is abnormal; when the OPT1 optocoupler circuit signal is 1, the OPT2 optocoupler circuit signal is 0, the output second contact J2 is abnormal; when the OPT1 optocoupler circuit is abnormal The signal is 1, the signal of the OPT2 optocoupler circuit is 1, and the output OPT1 optocoupler circuit and OPT2 optocoupler circuit are abnormal;

The control command is that the first contact J1 is disconnected and the second contact J2 is closed: when the OPT1 optocoupler circuit and OPT2 optocoupler circuit signals are both 0, the output of the second contact J2 or the tripping plate is abnormal; when the OPT1 optocoupler circuit signal is 0, When the OPT2 optocoupler circuit signal is 1, the output of the first contact J1 and the second contact J2 is abnormal; when the OPT1 optocoupler circuit signal is 1, the OPT2 optocoupler circuit signal is 0, the output second contact J2 is normal; when the OPT1 optocoupler circuit signal is If it is 1, the OPT2 optocoupler circuit signal is 1, and the output OPT1 optocoupler loop and OPT2 optocoupler loop are abnormal;

The control command is that the first contact J1 is closed and the second contact J2 is open: when the OPT1 optocoupler circuit and OPT2 optocoupler circuit signals are both 0, the output of the first contact J1 is abnormal; when the OPT1 optocoupler circuit signal is 0, OPT2 optocoupler When the loop signal is 1, the output first contact J1 is normal; when the OPT1 optocoupler loop signal is 1, the OPT2 optocoupler loop signal is 0, the output first contact J1 and the second contact J2 are abnormal; when the OPT1 optocoupler loop signal is 1, The OPT2 optocoupler circuit signal is 1, and the output OPT1 optocoupler loop and OPT2 optocoupler loop are abnormal.

As a preferred solution, when the TWJ optocoupler circuit signal is 0, the output OPT1 optocoupler circuit and OPT2 optocoupler circuit are abnormal or the first contact J1 and the second contact J2 are abnormally closed; when the TWJ optocoupler circuit signal is 1, the output can be automatically inspection procedure.

As a preferred solution, the control command is that the first contact J1 and the second contact J2 are both closed: the trip control loop is in a working state, and the output exits the self-checking procedure.

As a preferred solution, the control command is that both the second contact J3 and the fourth contact J4 are disconnected: when the OPT3 optocoupler circuit and OPT4 optocoupler circuit signals are both 0, the output of the third contact J3 and the fourth contact J4 is normal; The coupling loop signal is 0, the OPT4 optocoupler loop signal is 1, and the output third contact J3 is abnormal; when the OPT3 optocoupler loop signal is 1, the OPT4 optocoupler loop signal is 0, the output fourth contact J4 is abnormal; when the OPT3 optocoupler loop signal is 0, the output fourth contact J4 is abnormal; The signal is 1, the signal of the OPT4 optocoupler circuit is 1, and the output OPT3 optocoupler loop and OPT4 optocoupler loop are abnormal;

The control command is that the third contact J3 is opened and the fourth contact J4 is closed: when the OPT3 optocoupler circuit and OPT4 optocoupler circuit signals are both 0, the fourth contact J4 or the closing pressure plate is abnormal; when the OPT3 optocoupler circuit signal is 0 , the OPT4 optocoupler circuit signal is 1, the output of the third contact J3 and the fourth contact J4 is abnormal; when the OPT3 optocoupler circuit signal is 1, the OPT4 optocoupler circuit signal is 0, the output fourth contact J4 is normal; when the OPT3 optocoupler circuit is normal The signal is 1, the signal of the OPT4 optocoupler circuit is 1, and the output OPT3 optocoupler loop and OPT4 optocoupler loop are abnormal;

The control command is that the third contact J3 is closed and the fourth contact J4 is disconnected: when the OPT3 optocoupler circuit and OPT4 optocoupler circuit signals are both 0, the output of the third contact J3 is abnormal; when the OPT3 optocoupler circuit signal is 0, OPT4 optocoupler When the loop signal is 1, the output third contact J3 is normal; when the OPT3 optocoupler loop signal is 1, the OPT4 optocoupler loop signal is 0, the output third contact J3 and the fourth contact J4 are abnormal; when the OPT3 optocoupler loop signal is 1, The OPT4 optocoupler circuit signal is 1, and the output OPT3 optocoupler loop and OPT4 optocoupler loop are abnormal.

As a preferred solution, when the HWJ optocoupler circuit signal is 0, the output OPT3 optocoupler circuit, OPT4 optocoupler circuit is abnormal or the third contact J3 and fourth contact J4 are abnormally closed; when the HWJ optocoupler circuit signal is 1, the output can be automatically inspection procedure.

As a preferred solution, the control command is that the third contact J3 and the fourth contact J4 are closed: the closing control loop is in a working state, and the output exits the self-checking procedure.

Beneficial effects: The present invention provides a substation circuit breaker control circuit and a monitoring method thereof. Through the control circuit connected in series between the operating power supply and the internal contact of the circuit breaker and the monitoring circuit connected in parallel to the control circuit, the monitoring circuit can be analyzed and monitored through analysis and monitoring. The circuit signal condition is used to judge the working state of the switch node in the control loop, which is used to ensure that the working state of the switch node meets the requirements when controlling the opening or closing of the circuit breaker, so as to ensure the correctness of the circuit breaker action.

Specifically, through the OPT1, OPT2, OPT3, and OPT4 optocoupler circuits connected in parallel on the control circuit, the working status of the switch nodes in the trip or closing control circuit is judged respectively, and the switch nodes in the control circuit are confirmed when the control circuit breaker is opened or closed. It is in a normal state, so as to ensure that the entire control loop can operate correctly when needed, and realize the state maintenance of the entire control loop.

In addition, through the HWJ optocoupler circuit and the TWJ optocoupler circuit connected in parallel on the control circuit, by analyzing the signal conditions of the HWJ optocoupler circuit and the TWJ optocoupler circuit, it is judged whether the monitoring circuit is working normally, so as to ensure the relay control circuit with the monitoring circuit. electrical integrity.

Description of drawings

FIG. 1 is a schematic structural diagram of a control loop of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, a substation circuit breaker control loop includes: a trip control loop and a closing control loop connected between the positive pole of the operating power supply and the negative pole of the operating power supply, and the tripping control loop and the closing control loop are connected in parallel with the positive pole of the operating power supply and the operating power supply. between the negative poles of the power supply.

The trip control circuit includes: the first contact J1 of the trip relay, the second contact J2 of the trip relay, and the first contact J1 and the second contact J2 are connected in series with the trip pressure plate, the trip holding coil TBJ, the internal contact DL1 of the circuit breaker, and the trip coil. ;The contact TBJA of the trip holding coil TBJ is connected in parallel between the positive pole of the operating power supply and the common point of the trip pressure plate and the trip holding coil TBJ; the OPT1 optocoupler circuit is connected in parallel between the positive pole of the operating power supply and the common point of the first contact J1 and the second contact J2; The OPT2 optocoupler circuit is connected in parallel between the common point of the first contact J1 and the second contact J2 and the common point of the trip pressure plate and the trip holding coil TBJ; the TWJ optocoupler circuit is connected in parallel between the positive pole of the operating power supply, the trip pressure plate and the common point of the trip holding coil TBJ. between.

The closing control circuit includes: the third contact J3 of the closing relay, the fourth contact J4 of the closing relay, the third contact J3 and the fourth contact J4 and the closing pressure plate, the closing holding coil HBJ, and the internal contact DL2 of the circuit breaker. , the closing coils are connected in series; the contact HBJA of the closing holding coil HBJ is connected in parallel between the positive pole of the operating power supply, the closing pressure plate, and the common point of the closing holding coil HBJ; the OPT3 optocoupler circuit is connected in parallel with the positive pole of the operating power supply and the third contact J3, Between the common point of the fourth contact J4; the OPT4 optocoupler circuit is connected in parallel between the third contact J3, the fourth contact J4 common point and the closing pressure plate and the closing holding coil HBJ common point; HWJ optocoupler circuit is connected in parallel with the positive pole of the operating power supply Between the closing pressure plate and the common point of the closing holding coil HBJ.

When the circuit breaker in the substation is about to trip, the controller sends a closing signal to the first contact J1 and the second contact J2, and sends a working signal to the trip holding coil TBJ; the first contact J1 and the second contact J2 are closed, and the trip holding coil TBJ works; when the control circuit is normal, the trip pressure plate is in a closed state, the internal contact DL1 of the circuit breaker is in a closed state, the trip coil is turned on, and the circuit breaker is disconnected. Since the trip holding coil TBJ works, the contact TBJA is closed to hold the current between the trip coils. When the circuit breaker is tripped, the internal contact DL1 of the circuit breaker is disconnected, the trip coil returns to the initial state, and the internal contact DL2 of the circuit breaker is closed.

When the circuit breaker in the substation is to be closed, the controller sends a closing signal to the third contact J3 and the fourth contact J4, and sends a working signal to the closing holding coil HBJ; the third contact J3 and the fourth contact J4 are closed, and the closing The brake holding coil HBJ works; when the control circuit is normal, the closing pressure plate is in a closed state, the internal contact DL2 of the circuit breaker is in a closed state, the closing coil is turned on, and the circuit breaker is closed. Since the closing holding coil TBJ works, the contact HBJA is closed to keep the current between the closing coils. When the circuit breaker is closed, the internal contact DL2 of the circuit breaker is disconnected, the closing coil returns to the initial state, and the internal contact DL1 of the circuit breaker is closed.

When the first contact J1 and the second contact J2 are disconnected, the OPT1 optocoupler circuit, the OPT2 optocoupler circuit, and the TWJ optocoupler circuit have currents flowing through, because the resistance in the OPT1 optocoupler circuit, OPT2 optocoupler circuit, and TWJ optocoupler circuit is very large. The resistance when the trip holding coil TBJ and the trip coil are turned on, so the current flowing through the OPT1 optocoupler circuit, the OPT2 optocoupler circuit, and the TWJ optocoupler circuit is less than the operating current of the trip hold coil TBJ and the trip coil, so there will not be enough The magnetic force makes the armature act, but it can keep the OPT1 optocoupler circuit, OPT2 optocoupler circuit, and TWJ optocoupler circuit conducting. If the first contact J1 and the second contact J2 are closed, it means that the OPT1 optocoupler circuit, OPT2 optocoupler circuit, and TWJ optocoupler circuit are short-circuited, and the current in the OPT1 optocoupler circuit, OPT2 optocoupler circuit, and TWJ optocoupler circuit is less than the set value. threshold, the indicator light of the optocoupler circuit will not light up.

When the current in the OPT1 optocoupler circuit and OPT2 optocoupler circuit is greater than the threshold value, the indicators in the OPT1 optocoupler circuit and OPT2 optocoupler circuit are on, and the signal is set to 1; when the current is less than the threshold value, the OPT1 optocoupler circuit and the OPT2 optocoupler circuit indicate The light is off and the signal is set to 0. The threshold value can be greater than the series current of the OPT1 optocoupler loop and the OPT2 optocoupler loop, and less than the smaller value of the two separate conduction currents of the OPT1 optocoupler loop and the OPT2 optocoupler loop. When the TWJ optocoupler circuit is on, the indicator light in the TWJ optocoupler circuit is on, and the signal is set to 1; if it is not conductive, the indicator light in the TWJ optocoupler circuit is off, and the signal is set to 0.

When the third contact J3 and the fourth contact J4 are disconnected, the OPT3 optocoupler circuit, the OPT4 optocoupler circuit, and the HWJ optocoupler circuit have currents flowing through, because the resistance in the OPT3 optocoupler circuit, OPT4 optocoupler circuit, and HWJ optocoupler circuit is very large. It is the resistance when the closing holding coil HBJ and the closing coil are turned on, so the current flowing through the OPT3 optocoupler circuit, the OPT4 optocoupler circuit, and the HWJ optocoupler circuit is less than the working current of the closing holding coil HBJ and the closing coil. There will not be enough magnetic force to make the armature act, but it can keep the OPT3 optocoupler circuit, OPT4 optocoupler circuit, and HWJ optocoupler circuit conducting. If the third contact J3 and the fourth contact J4 are closed, it means that the OPT3 optocoupler circuit, OPT4 optocoupler circuit, and HWJ optocoupler circuit are short-circuited, and the current in the OPT3 optocoupler circuit, OPT4 optocoupler circuit, and HWJ optocoupler circuit is less than the set value. threshold, the indicator light of the optocoupler circuit will not light up.

When the current in the OPT3 optocoupler circuit and OPT4 optocoupler circuit is greater than the threshold value, the indicator light in the OPT3 optocoupler circuit and the OPT4 optocoupler circuit is on, and the signal is set to 1; when the current is less than the threshold value, the OPT3 optocoupler circuit and the OPT4 optocoupler circuit indicate The light is off and the signal is set to 0. The threshold value can be larger than the series current of the OPT3 optocoupler loop and the OPT4 optocoupler loop, and less than the smaller value of the two separate conduction currents of the OPT3 optocoupler loop and the OPT4 optocoupler loop. The HWJ optocoupler circuit is turned on, the indicator light in the HWJ optocoupler circuit is on, and the signal is set to 1; if it is not conductive, the indicator light in the HWJ optocoupler circuit is off, and the signal is set to 0.

In order to ensure the correct operation of the circuit breaker in the substation when needed, it is very important to monitor the first contact J1, the second contact J2, the tripping pressure plate, the third contact J3, the fourth contact J4 and the closing pressure plate in the control loop. The following is the monitoring method of the control loop of the present invention.

A method for monitoring a control loop of a circuit breaker in a substation, comprising: tripping control loop monitoring and closing control loop monitoring.

Trip control loop monitoring, including the following steps:

The control command is that both the first contact J1 and the second contact J2 are disconnected:

When the OPT1 optocoupler circuit and OPT2 optocoupler circuit signals are both 0, the TWJ optocoupler circuit signal is 1, and the output first contact J1 and second contact J2 are normal;

When the OPT1 optocoupler loop signal is 0, the OPT2 optocoupler loop signal is 1, and the TWJ optocoupler loop signal is 1, the output first contact J1 is abnormal;

When the OPT1 optocoupler circuit signal is 1, the OPT2 optocoupler circuit signal is 0, and the TWJ optocoupler circuit signal is 1, the output second contact J2 is abnormal;

When the OPT1 optocoupler circuit signal is 1, the OPT2 optocoupler circuit signal is 1, and the TWJ optocoupler circuit signal is 1, the output OPT1 optocoupler circuit and OPT2 optocoupler circuit are abnormal;

The control command is to open the first contact J1 and close the second contact J2:

When the OPT1 optocoupler circuit and OPT2 optocoupler circuit signals are both 0, and the TWJ optocoupler circuit signal is 1, the output of the second contact J2 or the tripping plate is abnormal;

When the OPT1 optocoupler loop signal is 0, the OPT2 optocoupler loop signal is 1, and the TWJ optocoupler loop signal is 1, the output of the first contact J1 and the second contact J2 is abnormal;

When the OPT1 optocoupler loop signal is 1, the OPT2 optocoupler loop signal is 0, the TWJ optocoupler loop signal is 1, and the output second contact J2 is normal;

When the OPT1 optocoupler circuit signal is 1, the OPT2 optocoupler circuit signal is 1, and the TWJ optocoupler circuit signal is 1, the output OPT1 optocoupler circuit and OPT2 optocoupler circuit are abnormal;

The control command is that the first contact J1 is closed and the second contact J2 is opened:

When the OPT1 optocoupler circuit and OPT2 optocoupler circuit signals are both 0, the TWJ optocoupler circuit signal is 1, and the output first contact J1 is abnormal;

When the OPT1 optocoupler circuit signal is 0, the OPT2 optocoupler circuit signal is 1, and the TWJ optocoupler circuit signal is 1, the output first contact J1 is normal;

When the OPT1 optocoupler loop signal is 1, the OPT2 optocoupler loop signal is 0, and the TWJ optocoupler loop signal is 1, the output of the first contact J1 and the second contact J2 is abnormal;

When the OPT1 optocoupler circuit signal is 1, the OPT2 optocoupler circuit signal is 1, and the TWJ optocoupler circuit signal is 1, the output OPT1 optocoupler circuit and OPT2 optocoupler circuit are abnormal;

The control command is the first contact J1, and the second contact J2 is closed: the trip control circuit is in the working state, and the output exits the self-checking procedure;

When the TWJ optocoupler circuit signal is 0, the output OPT1 optocoupler loop, OPT2 optocoupler loop is abnormal or the first contact J1 and the second contact J2 are abnormally closed.

In the above control process, when the TWJ optocoupler circuit signal is 1, it means that there is no trip command, and the first contact J1, the second contact J2, and the trip pressure plate can be self-checked. The specific results are shown in Table 1. 1 means the light in the optocoupler circuit is on, 0 means the light in the optocoupler circuit is off, X means no state; 1 in the control command means closed, 0 means open, and X means no state.

Table 1 Trip control loop monitoring results

The monitoring of the closing control loop includes the following steps:

The control command is that both the second contact J3 and the fourth contact J4 are disconnected:

When the OPT3 optocoupler circuit and OPT4 optocoupler circuit signals are both 0, the HWJ optocoupler circuit signal is 1, and the output of the third contact J3 and the fourth contact J4 is normal;

When the OPT3 optocoupler circuit signal is 0, the OPT4 optocoupler circuit signal is 1, and the HWJ optocoupler circuit signal is 1, the output third contact J3 is abnormal;

When the OPT3 optocoupler circuit signal is 1, the OPT4 optocoupler circuit signal is 0, and the HWJ optocoupler circuit signal is 1, the output fourth contact J4 is abnormal;

When the OPT3 optocoupler loop signal is 1, the OPT4 optocoupler loop signal is 1, and the HWJ optocoupler loop signal is 1, the output OPT3 optocoupler loop and OPT4 optocoupler loop are abnormal;

The control command is to open the third contact J3 and close the fourth contact J4:

When the OPT3 optocoupler circuit and OPT4 optocoupler circuit signals are both 0, the HWJ optocoupler circuit signal is 1, the output of the fourth contact J4 or the closing pressure plate is abnormal;

When the OPT3 optocoupler loop signal is 0, the OPT4 optocoupler loop signal is 1, and the HWJ optocoupler loop signal is 1, the output of the third contact J3 and the fourth contact J4 is abnormal;

When the OPT3 optocoupler loop signal is 1, the OPT4 optocoupler loop signal is 0, the HWJ optocoupler loop signal is 1, and the output fourth contact J4 is normal;

When the OPT3 optocoupler loop signal is 1, the OPT4 optocoupler loop signal is 1, and the HWJ optocoupler loop signal is 1, the output OPT3 optocoupler loop and OPT4 optocoupler loop are abnormal;

The control command is that the third contact J3 is closed and the fourth contact J4 is opened:

When the OPT3 optocoupler circuit and OPT4 optocoupler circuit signals are both 0, the HWJ optocoupler circuit signal is 1, and the output third contact J3 is abnormal;

When the OPT3 optocoupler loop signal is 0, the OPT4 optocoupler loop signal is 1, the HWJ optocoupler loop signal is 1, and the output third contact J3 is normal;

When the OPT3 optocoupler circuit signal is 1, the OPT4 optocoupler circuit signal is 0, and the HWJ optocoupler circuit signal is 1, the output of the third contact J3 and the fourth contact J4 is abnormal;

When the OPT3 optocoupler loop signal is 1, the OPT4 optocoupler loop signal is 1, and the HWJ optocoupler loop signal is 1, the output OPT3 optocoupler loop and OPT4 optocoupler loop are abnormal;

The control command is the third contact J3, and the fourth contact J4 is closed: the closing control circuit is in the working state, and the output exits the self-checking procedure;

When the HWJ optocoupler circuit signal is 0, the output OPT3 optocoupler loop, OPT4 optocoupler loop is abnormal or the third contact J3 and the fourth contact J4 are abnormally closed.

In the above control process, when the HWJ optocoupler circuit signal is 1, it means that there is no closing command, and the third contact J3, the fourth contact J4, and the closing pressure plate can be self-checked. The specific results are shown in Table 2. 1 means the light in the optocoupler circuit is on, 0 means the light in the optocoupler circuit is off, X means no state; 1 in the control command means closed, 0 means open, and X means no state.

Table 2 Monitoring results of closing control loop

When abnormal results are detected, operation and maintenance personnel can be arranged to take the initiative to repair, avoiding a lot of work caused by regular maintenance, improving operation and maintenance efficiency, and reducing operation and maintenance costs.

The above is only the preferred embodiment of the present invention, it should be pointed out that: for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made, and these improvements and modifications are also It should be regarded as the protection scope of the present invention.

Claims (16)

1. A substation circuit breaker control loop, comprising: a tripping control loop and/or a closing control loop, characterized in that: the tripping control loop is connected between the positive pole of the operating power supply and the negative pole of the operating power supply, and the tripping control loop is In order to control the tripping of the circuit breaker in the substation, the tripping control loop is connected in parallel with the tripping monitoring loop, and the tripping monitoring loop is used to monitor the working state of the switch node in the tripping control loop; the closing control loop is connected between the positive pole of the operating power supply and the negative pole of the operating power supply The closing control circuit is used to control the closing of the substation circuit breaker, the closing control circuit is connected in parallel with the closing monitoring circuit, and the closing monitoring circuit is used to monitor the working state of the switch nodes in the closing control circuit. 2 . The control circuit of a substation circuit breaker according to claim 1 , wherein the trip control circuit comprises: the first contact J1 of the trip relay, the second contact J2 of the trip relay, the first contact J1 and the third The second contact J2 is connected in series with the trip pressure plate, the trip holding coil TBJ, the internal contact DL1 of the circuit breaker, and the trip coil; the contact TBJA of the trip holding coil TBJ is connected in parallel between the positive pole of the operating power supply and the common point of the trip pressure plate and the trip holding coil TBJ; The trip monitoring loop includes: OPT1 optocoupler loop, OPT2 optocoupler loop, the OPT1 optocoupler loop is connected in parallel between the positive pole of the operating power supply and the common point of the first contact J1 and the second contact J2; the OPT2 optocoupler loop is connected in parallel with the first contact J1 , Between the common point of the second contact J2 and the common point of the trip pressure plate and the trip holding coil TBJ. 3. A substation circuit breaker control loop according to claim 2, characterized in that: further comprising a TWJ optocoupler loop, the TWJ optocoupler loop is connected in parallel between the positive pole of the operating power supply, the trip pressure plate, and the common point of the trip holding coil TBJ. between. 4. The control circuit of a substation circuit breaker according to claim 2 or 3, characterized in that: when the current in the OPT1 optocoupler circuit and the OPT2 optocoupler circuit is greater than the threshold value, the indicator lights in the OPT1 optocoupler circuit and the OPT2 optocoupler circuit are on. The signal is set to 1; when the current is less than the threshold, the indicators in the OPT1 optocoupler circuit and OPT2 optocoupler circuit are off, and the signal is set to 0; The smaller value of the two separate conduction currents of the coupling loop and the OPT2 optocoupler loop. 5. A substation circuit breaker control circuit according to claim 3, characterized in that: the TWJ optocoupler circuit is turned on, the indicator light in the TWJ optocoupler circuit is on, and the signal is set to 1; The middle indicator light is off, and the signal is set to 0. 6 . The control circuit of a substation circuit breaker according to claim 1 , wherein the closing control circuit comprises: the third contact J3 of the closing relay, the fourth contact J4 of the closing relay, and the third contact connected in series. 7 . J3 and the fourth contact J4 are connected in series with the closing pressure plate, the closing holding coil HBJ, the internal contact DL2 of the circuit breaker, and the closing coil; the contact HBJA of the closing holding coil HBJ is connected in parallel with the positive pole of the operating power supply and the closing pressure plate, closing Keep between the common points of the coil HBJ; the closing monitoring loop includes: OPT3 optocoupler loop, OPT4 optocoupler loop, and the OPT3 optocoupler loop is connected in parallel between the positive pole of the operating power supply and the common point of the third contact J3 and the fourth contact J4; The OPT4 optocoupler circuit is connected in parallel between the common point of the third contact J3 and the fourth contact J4 and the common point of the closing pressure plate and the closing holding coil HBJ. 7. A substation circuit breaker control circuit according to claim 6, characterized in that: further comprising a HWJ optocoupler circuit, and the HWJ optocoupler circuit is connected in parallel with the positive pole of the operating power supply, the closing pressure plate, and the closing holding coil HBJ in common between points. 8. A substation circuit breaker control circuit according to claim 6 or 7, characterized in that: when the current in the OPT3 optocoupler loop and the OPT4 optocoupler loop is greater than the threshold value, the indicator lights in the OPT3 optocoupler loop and the OPT4 optocoupler loop are on. The signal is set to 1; when the current is less than the threshold, the indicators in the OPT3 optocoupler circuit and OPT4 optocoupler circuit are off, and the signal is set to 0; The smaller value of the two separate conduction currents of the coupling loop and the OPT4 optocoupler loop. 9. A substation circuit breaker control circuit according to claim 6, characterized in that: the HWJ optocoupler circuit is turned on, the indicator light in the HWJ optocoupler circuit is on, and the signal is set to 1; The middle indicator light is off, and the signal is set to 0. 10. A method for monitoring the control loop of a substation circuit breaker, comprising: monitoring the tripping control loop and/or monitoring the closing control loop, characterized in that: Control the open and closed state of the switch node in the trip control loop, and judge the working state of the switch node and the optocoupler circuit according to the light on and off of the optocoupler loop indicator; Control the opening and closing state of the switch node in the closing control loop, and judge the working state of the switch node and the optocoupler circuit according to the light on and off of the optocoupler loop indicator. 11. A method for monitoring the control loop of a substation circuit breaker according to claim 10, wherein the control command is that both the first contact J1 and the second contact J2 are disconnected: when the OPT1 optocoupler loop, OPT2 optocoupler loop signal If both are 0, the output first contact J1 and the second contact J2 are normal; when the OPT1 optocoupler circuit signal is 0, the OPT2 optocoupler circuit signal is 1, the output first contact J1 is abnormal; when the OPT1 optocoupler circuit signal is 1, OPT2 When the optocoupler circuit signal is 0, the output of the second contact J2 is abnormal; when the OPT1 optocoupler circuit signal is 1, the OPT2 optocoupler circuit signal is 1, the output OPT1 optocoupler circuit and the OPT2 optocoupler circuit are abnormal; The control command is that the first contact J1 is disconnected and the second contact J2 is closed: when the OPT1 optocoupler circuit and OPT2 optocoupler circuit signals are both 0, the output of the second contact J2 or the tripping plate is abnormal; when the OPT1 optocoupler circuit signal is 0, When the OPT2 optocoupler circuit signal is 1, the output of the first contact J1 and the second contact J2 is abnormal; when the OPT1 optocoupler circuit signal is 1, the OPT2 optocoupler circuit signal is 0, the output second contact J2 is normal; when the OPT1 optocoupler circuit signal is If it is 1, the OPT2 optocoupler circuit signal is 1, and the output OPT1 optocoupler loop and OPT2 optocoupler loop are abnormal; The control command is that the first contact J1 is closed and the second contact J2 is open: when the OPT1 optocoupler circuit and OPT2 optocoupler circuit signals are both 0, the output of the first contact J1 is abnormal; when the OPT1 optocoupler circuit signal is 0, OPT2 optocoupler When the loop signal is 1, the output first contact J1 is normal; when the OPT1 optocoupler loop signal is 1, the OPT2 optocoupler loop signal is 0, the output first contact J1 and the second contact J2 are abnormal; when the OPT1 optocoupler loop signal is 1, The OPT2 optocoupler circuit signal is 1, and the output OPT1 optocoupler loop and OPT2 optocoupler loop are abnormal. 12. A method for monitoring the control loop of a substation circuit breaker according to claim 10, characterized in that: when the TWJ optocoupler loop signal is 0, the output OPT1 optocoupler loop, OPT2 optocoupler loop is abnormal or the first contact J1, the first The second contact J2 is abnormally closed; when the TWJ optocoupler circuit signal is 1, the output can perform a self-check procedure. 13. A method for monitoring the control loop of a substation circuit breaker according to claim 11 or 12, characterized in that: the control command is that the first contact J1 and the second contact J2 are both closed: the trip control loop is in a working state, and the output exits from the automatic control circuit. inspection procedure. 14. A method for monitoring the control loop of a substation circuit breaker according to claim 10, wherein the control command is that both the second contact J3 and the fourth contact J4 are disconnected: when the OPT3 optocoupler loop, the OPT4 optocoupler loop signal All are 0, the output of the third contact J3 and the fourth contact J4 is normal; when the OPT3 optocoupler circuit signal is 0, the OPT4 optocoupler circuit signal is 1, the output third contact J3 is abnormal; when the OPT3 optocoupler circuit signal is 1, OPT4 When the optocoupler circuit signal is 0, the output fourth contact J4 is abnormal; when the OPT3 optocoupler circuit signal is 1, the OPT4 optocoupler circuit signal is 1, the output OPT3 optocoupler circuit and the OPT4 optocoupler circuit are abnormal; The control command is that the third contact J3 is opened and the fourth contact J4 is closed: when the OPT3 optocoupler circuit and OPT4 optocoupler circuit signals are both 0, the fourth contact J4 or the closing pressure plate is abnormal; when the OPT3 optocoupler circuit signal is 0 , the OPT4 optocoupler circuit signal is 1, the output of the third contact J3 and the fourth contact J4 is abnormal; when the OPT3 optocoupler circuit signal is 1, the OPT4 optocoupler circuit signal is 0, the output fourth contact J4 is normal; when the OPT3 optocoupler circuit is normal The signal is 1, the signal of the OPT4 optocoupler circuit is 1, and the output OPT3 optocoupler loop and OPT4 optocoupler loop are abnormal; The control command is that the third contact J3 is closed and the fourth contact J4 is disconnected: when the OPT3 optocoupler circuit and OPT4 optocoupler circuit signals are both 0, the output of the third contact J3 is abnormal; when the OPT3 optocoupler circuit signal is 0, OPT4 optocoupler When the loop signal is 1, the output third contact J3 is normal; when the OPT3 optocoupler loop signal is 1, the OPT4 optocoupler loop signal is 0, the output third contact J3 and the fourth contact J4 are abnormal; when the OPT3 optocoupler loop signal is 1, The OPT4 optocoupler circuit signal is 1, and the output OPT3 optocoupler loop and OPT4 optocoupler loop are abnormal. 15. A method for monitoring the control loop of a substation circuit breaker according to claim 10, characterized in that: when the HWJ optocoupler loop signal is 0, the output OPT3 optocoupler loop, OPT4 optocoupler loop is abnormal or the third contact J3, the first optocoupler loop is abnormal. The four-contact J4 is abnormally closed; when the HWJ optocoupler circuit signal is 1, the output can perform a self-check procedure. 16. A method for monitoring a control loop of a substation circuit breaker according to claim 14 or 15, wherein the control command is that the third contact J3 and the fourth contact J4 are closed: the closing control loop is in a working state, and the output exits Self-check procedure.

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