CN114023608B - A high voltage circuit breaker and its locking control system - Google Patents

Abstract

The invention relates to a high-voltage circuit breaker and a locking control system thereof, comprising a detection relay, a locking relay and a controller; the coil of the detection relay is connected in series in at least one phase of circuit breaker switching-on loop, and the controller is connected with the auxiliary contact of the detection relay in a sampling way and is used for collecting the times of circuit breaker switching-on signal generation; the controller is also controlled to be connected with a locking relay, and a normally closed contact of the locking relay is used for being connected in series in a closing loop of the circuit breaker; when the controller detects that the switching-on signal of the circuit breaker is generated for a set number of times in a set time period, the normally closed contact of the latching relay is controlled to be opened, and the circuit breaker is latched. The locking control system can set corresponding continuous operation times and interval time according to the parameters of the circuit breaker, so that when the high-voltage circuit breaker configured with the module reaches the times of closing operation in a short time, the closing operation of the high-voltage circuit breaker is locked, and the damage of the circuit breaker is avoided.

Description

A high voltage circuit breaker and its locking control system

Technical Field

The invention relates to a high-voltage circuit breaker and a locking control system thereof, belonging to the technical field of high-voltage electrical appliances.

Background technique

There are many types of operating overvoltages with different characteristics in the power system, and high-voltage circuit breaker operation is the main cause of operating overvoltage. In high-voltage power grids, the overvoltage of closing unloaded lines has become the main operating overvoltage. In particular, the overvoltage is more serious when the unloaded lines of long-distance ultra-high voltage transmission lines are closed. In the power system, line closing is a common operation. In order to limit the overvoltage of closing unloaded lines, in long-distance ultra-high voltage transmission lines, circuit breakers are equipped with parallel resistors as the main measure to limit the overvoltage of closing unloaded lines. The resistance of this parallel resistor to limit the overvoltage of closing unloaded lines is about several hundred ohms. When such lines occasionally fail, there may be multiple reclosing operations. For circuit breakers with closing resistors, due to frequent closing operations, the closing resistors generate a lot of heat in a short period of time. The accumulation of this heat will cause damage to the closing resistors and the entire circuit breaker.

At the same time, circuit breakers from different manufacturers have different structural dimensions and closing resistance values, and the closing resistance has different tolerance to the heat generated after live operation. If the function of limiting the frequent closing operation of high-voltage circuit breakers with closing resistance in a short period of time is placed in the background protection or measurement and control device, because the protection and measurement and control devices need to adapt to high-voltage circuit breakers with different technical parameters from different manufacturers, and the protection and measurement and control device manufacturers and high-voltage circuit breakers belong to different technical directions, the difficulty of technical integration is relatively large, and it is difficult to define the responsibility after problems such as improper parameter settings occur.

Summary of the invention

The object of the present invention is to provide a high voltage circuit breaker and its locking control system, so as to solve the problem that the circuit breaker is damaged due to heat accumulation and the limiting module cannot be installed in the background protection or measurement and control device.

To achieve the above object, the solution of the present invention includes:

A locking control system for a high-voltage circuit breaker of the present invention comprises a detection relay, a locking relay and a controller; the coil of the detection relay is used to be connected in series in a closing circuit of a circuit breaker of at least one phase, the coil of the detection relay is used to be energized when the circuit breaker is closed, so that the auxiliary contact of the detection relay is closed, the controller samples the auxiliary contact of the detection relay, and collects the number of times the circuit breaker closing signal is generated according to the closing signal of the auxiliary contact; the controller also controls the connection of the locking relay, and the normally closed contact of the locking relay is used to be connected in series in the closing circuit of the circuit breaker;

When the controller detects that the circuit breaker closing signal is generated a set number of times within a set time period, it controls the normally closed contact of the locking relay to open and lock the circuit breaker.

The present invention provides a locking control system for a high-voltage circuit breaker, which is connected in series with the circuit breaker. The locking control system can set the corresponding number of continuous operations and interval time according to the circuit breaker's own parameters, so that when the high-voltage circuit breaker equipped with the module reaches the number of closing operations in a short time, the closing operation of the high-voltage circuit breaker is locked to avoid damage to the circuit breaker.

Furthermore, the circuit breaker closing circuit is also connected in parallel with an alarm circuit, in which a normally open contact of a locking relay and an indicator light are connected in series.

When the number of circuit breaker operations reaches the set value within the set time, the circuit breaker is locked and the indicator light is on, indicating that the circuit breaker is currently in the locked state, which is clearer.

Furthermore, a reverse protection circuit is connected in parallel to the detection relay coil to prevent reverse current.

By connecting the protection circuit in parallel, the reverse current and the protection circuit form a loop to protect the circuit.

Furthermore, a power supply module for supplying power to the controller is used to be connected to a main control power supply of a circuit breaker.

The power module is directly connected to the main control power supply of the circuit breaker, which is convenient and fast.

Furthermore, there are three detection relays, which are respectively used to be connected in series to the closing circuits of the three phases of the circuit breaker, and the controller samples the auxiliary contacts of the three detection relays respectively.

When the three-phase circuit breakers cannot operate simultaneously, a detection relay is provided on each circuit breaker closing circuit to detect the number of operations and time of each phase circuit breaker.

A high-voltage circuit breaker of the present invention comprises a circuit breaker closing circuit and a locking control system, wherein the locking control system comprises a detection relay, a locking relay and a controller; a detection relay coil for detecting a circuit breaker closing signal is connected in series to at least one phase closing circuit of the circuit breaker, the detection relay coil is used to be energized when the circuit breaker is closed, so that the auxiliary contact of the detection relay is closed, the controller samples the auxiliary contact connected to the detection relay, and collects the number of times the circuit breaker closing signal is generated according to the closing signal of the auxiliary contact; the controller also controls the connection of the locking relay, and the normally closed contact of the locking relay is connected in series with the circuit breaker closing coil;

When the controller detects that the circuit breaker closing signal occurs a set number of times within the set time, it controls the normally closed contact of the locking relay to open and lock the circuit breaker.

The present invention provides a high-voltage circuit breaker, which includes a locking control system and a circuit breaker. The locking control system is connected in series with the circuit breaker. The locking control system can set corresponding continuous operation times and interval times according to the circuit breaker's own parameters, so that when the high-voltage circuit breaker configured with the module reaches the number of closing operations in a short time, the closing operation of the high-voltage circuit breaker is locked to avoid damage to the circuit breaker.

Furthermore, the circuit breaker closing circuit is also connected in parallel with an alarm circuit, in which a normally open contact of a locking relay and an indicator light are connected in series.

When the number of circuit breaker operations reaches the set value within the set time, the circuit breaker is locked and the indicator light is on, indicating that the circuit breaker is currently in the locked state, which is clearer.

Furthermore, a protection circuit is connected in parallel with the three-phase relay to prevent reverse current.

By connecting the protection circuit in parallel, the reverse current and the protection circuit form a loop to protect the circuit.

Furthermore, a power supply module for supplying power to the controller is used to be connected to a main control power supply of a circuit breaker.

The power module is directly connected to the main control power supply of the circuit breaker, which is convenient and fast.

Furthermore, there are three detection relays, which are respectively used to be connected in series to the closing circuits of the three phases of the circuit breaker, and the controller samples the auxiliary contacts of the three detection relays respectively.

When the three-phase circuit breakers cannot operate simultaneously, a detection relay is provided on each circuit breaker closing circuit to detect the number of operations and time of each phase circuit breaker.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a terminal wiring diagram of a circuit breaker self-defense locking module;

Figure 2 is a schematic diagram of the circuit breaker self-defense locking module;

FIG3 is a schematic diagram of a circuit breaker self-defense locking module in a circuit breaker closing circuit;

Figure 4 is a diagram of the module panel;

Figure 5 is a protection timing diagram of the module.

Detailed ways

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

System Example:

The present invention provides a locking control system for a high-voltage circuit breaker. As shown in FIG1, it is a terminal wiring diagram of a circuit breaker self-defense locking module. The circuit breaker self-defense locking module is installed on a three-phase circuit (phases A, B, and C), wherein A1, B1, and C1 are the positive poles of each phase; A2, B2, and C2 are the negative poles of each phase; port 13 is connected to the positive pole, and port 14 is connected to the negative pole; the line connected between port 13 and port 14 is used to indicate the closing circuit locking. As shown in FIG2, it is a principle block diagram of the circuit breaker self-defense locking module. The circuit breaker self-defense locking module mainly includes a relay and a control module (MCU). The relay coils (KA, KB, and KC) are respectively arranged in the three phases A, B, and C of the three-phase circuit, and two series diodes are also connected in parallel to the positive and negative poles of each relay coil (KA, KB, and KC) to prevent circuit backflow. The control module (MCU) is connected to a 5V power supply for power supply; the MCU also samples and connects the normally open contacts of the three relays KA, KB, and KC respectively. At the same time, the MCU also controls and connects the locking relay. The normally closed contacts of the locking relay are respectively set on each phase of the three-phase circuit. Specifically, the normally closed contacts of the locking relay are respectively connected in series between the circuits where the relay current is output to the negative pole (A2, B2, C2) of each phase, that is, between port 11 and port 12, between port 21 and port 22, and between port 31 and port 32; the normally open contact of the locking relay is set between port 13 and port 14.

As shown in FIG3 , which is a schematic diagram of the circuit breaker self-defense locking module in the circuit breaker closing circuit, the circuit breaker self-defense locking module 1 is arranged upstream of the circuit of the circuit breaker closing circuit 2. Between the circuit breaker self-defense locking module 1 and the positive pole of the circuit, a switch SM0 is arranged on each phase of the three-phase circuit; and an indicator light H1 for indicating that the circuit breaker closing circuit is disconnected is arranged downstream of the connection line between the port 13 and the port 14, and the negative pole of the indicator light H1 is connected to the negative pole of the circuit.

In the circuit breaker closing circuit 2, the circuit breakers of each phase circuit are connected in series between the circuit breaker self-defense locking module 1 of each phase circuit and the negative pole. The circuit breaker of the present invention adopts an air circuit breaker QF, and the closing coils YC1A, YC1B, and YC1C of each phase air circuit breaker are connected in series between A2, B2, and C2 and the negative pole of the circuit. The normally closed contacts QF1A, QF1B, and QF1C of each phase closing coil are respectively connected in series between the closing coils YC1A, YC1B, and YC1C and A2, B2, and C2. The normally closed contacts of anti-trip relays KFA, KFB, KFC are connected in series between the positive poles of QF1A, QF1B, QF1C and A2, B2, C2, and the anti-trip relay coils KFA, KFB, KFC are connected in parallel between A2, B2, C2 and the negative pole of the circuit. At the same time, the normally open contacts of anti-trip relays KFA, KFB, KFC are connected in series in the circuit of the parallel relay coils KFA, KFB, KFC. The normally open contacts of the closing coils QF1A, QF1B, QF1C are connected between port 13 and port 15, and are connected in parallel with the normally open contacts of the anti-trip relays KFA, KFB, KFC.

The power supply connected to the MCU can output a 5V stable power supply to power the entire module; the MCU, as a microprocessing unit, collects data for analysis, determines whether the current high-voltage circuit breaker has reached the number of operations within the set time, and controls the conduction or disconnection of the opening and closing circuit according to the calculation result; KA, KB, and KC, as circuit breaker closing operation measurement units, can measure the closing operation of the circuit breaker and input it to the MCU; the indicator light H1, as a signal output unit, can detect the protection status of the circuit breaker and send a signal; the present invention integrates the circuit breaker self-defense locking module into a module, as shown in Figure 4, which is a module panel diagram, and a setting unit is provided on the module panel to provide an input interface for manually setting the protection time and number of times.

Specifically, when the circuit breaker performs the closing operation, SM0 is closed, the circuit breaker closing coils YC1A, YC1B, and YC1C are energized and activated, and at the same time, the relay coils KA, KB, and KC are energized, and the corresponding relays KA, KB, and KC normally open contacts are closed, and the relay action is input into the MCU, which records the action and current time. The circuit breaker also acts accordingly at the moment the relay acts, so recording the action and time of the relay is equivalent to recording the action and time of the circuit breaker. The MCU only records the current action and current time of the relay, not the duration of the relay.

After SM0 is closed, the circuit breaker closing coils YC1A, YC1B, and YC1C are energized, and the normally closed contacts QF1A, QF1B, and QF1C of the closing coils are disconnected, and the circuit between port 21 and port 52 is disconnected; the normally open contacts of the closing coils QF1A, QF1B, and QF1C connected between port 13 and port 15 are closed, and the anti-trip relay coils KFA, KFB, and KFC are energized, and the normally open contacts of the corresponding anti-trip relays KFA, KFB, and KFC are closed, and the normally closed contacts of the anti-trip relays KFA, KFB, and KFC are opened. At the moment when the circuit between port 21 and port 52 is disconnected, the normally closed contacts QF1A, QF1B, and QF1C of the closing coils are restored to the closed state, and the normally open contacts of the closing coils QF1A, QF1B, and QF1C connected between port 13 and port 15 are restored to the open state. At this time, because the anti-trip relay coils KFA, KFB, and KFC are energized, the normally closed contacts of the anti-trip relays KFA, KFB, and KFC connected between port 21 and port 22 remain in the open state, and the circuit between port 21 and port 52 is still in the disconnected state, but the line where the anti-trip relay coils KFA, KFB, and KFC are located remains in the conducting state, so the normally open contacts of the anti-trip relays KFA, KFB, and KFC remain closed, and the circuit remains in the closed state.

Each time the circuit breaker is actuated, the MCU records it. When the circuit breaker performs the next closing operation, the corresponding closing times and time will be recorded. When the number of circuit breaker actions exceeds the set value within the set time, the circuit breaker self-defense locking module 1 disconnects the normally closed contacts of the locking relay connected to ports 11 and 12, disconnecting the circuit breaker closing circuit to ensure that the circuit breaker cannot be closed within the set time period. At the same time, the normally open contacts of the locking relay connected to ports 13 and 14 are closed, the indicator H1 lights up, and the circuit breaker locking signal is output.

Specifically, as shown in FIG5 , the protection timing diagram of the module is set to close the circuit breaker three times within 40 minutes, and the circuit breaker needs to rest for three hours before it can perform the closing operation. When the circuit breaker starts to operate, the MCU detects that the normally closed contact of the locking relay is closed. When the circuit breaker closes three times within 40 minutes, that is, the MCU detects that the normally closed contact of the locking relay is closed three times, the MCU controls the locking relay coil to disconnect the normally closed contact of the locking relay. After the time of the circuit breaker closing action three times and the time when the normally closed contact of the locking relay remains disconnected accumulates for 3 hours, the normally closed contact of the locking relay resumes the closed state. If the circuit breaker does not operate three times within 40 minutes, the normally closed contact of the locking relay remains closed and does not operate.

The present invention provides a circuit breaker self-defense locking module for protecting a high-voltage circuit breaker with a closing resistor, which can be made into a specific electrical component, and the electrical component is installed in the closing control circuit of the high-voltage circuit breaker. As shown in Figure 4, the first time you press the setting button to set the time, the digital tube starts to flash; press the button representing "plus" or "minus" to set the specific time; then press the confirmation button to confirm the current set time, and the setting time is now completed. Press the setting button again, the digital tube starts to flash; press the button representing "plus" or "minus" to set the specific number of times; then press the confirmation button to confirm the current set number of times, and the setting number is now completed.

The present invention provides a locking control system for a high-voltage circuit breaker. When the number of closing operations of the circuit breaker reaches a set value within a set time, the electrical component disconnects the closing operation circuit of the circuit breaker and locks the closing operation function of the circuit breaker. When the time reaches or exceeds the set value, the closing operation function of the circuit breaker is automatically restored. Thereby protecting the high-voltage circuit breaker with a closing resistor from being damaged. The setting value of the module can be calculated based on the thermal capacity parameter of the closing resistor of the high-voltage circuit breaker. The problem of frequent operation of the existing high-voltage circuit breaker with a closing resistor under energized conditions causing the closing resistor to heat up and be damaged is solved.

In the circuit breaker closing circuit, if the three-phase circuit breakers operate simultaneously, the locking control system only needs to be installed on the locking control circuit of one phase circuit breaker. If the three phases of the circuit breaker closing circuit operate separately, the locking control system needs to be installed on the locking control circuits of the three-phase circuit breakers respectively.

Circuit breaker example:

The high-voltage circuit breaker in this embodiment adopts a locking control system of the high-voltage circuit breaker. The locking control system of the high-voltage circuit breaker has been introduced clearly enough in the system embodiment and will not be described again here.

Claims (10)

1. A locking control system of a high-voltage circuit breaker is characterized by comprising a detection relay, a locking relay and a controller; the coil of the detection relay is used for being connected in series in a breaker closing loop of at least one phase, the coil of the detection relay is used for being electrified when the breaker is closed, so that an auxiliary contact of the detection relay is closed, the controller is connected with the auxiliary contact of the detection relay in a sampling way, and the times of the generation of the closing signal of the breaker is acquired according to the closing signal of the auxiliary contact; the controller is also controlled to be connected with a locking relay, and a normally closed contact of the locking relay is used for being connected in series in a closing loop of the circuit breaker;

and when the controller detects that the switching-on signal of the circuit breaker is generated for a set number of times in a set time period, the normally closed contact of the locking relay is controlled to be opened, and the circuit breaker is locked.

2. The lockout control system of the high voltage circuit breaker according to claim 1, wherein the circuit breaker closing circuit is further connected in parallel with an alarm circuit in which a normally open contact of a lockout relay and an indicator light are connected in series.

3. The latch control system of a high voltage circuit breaker according to claim 2, wherein the detection relay coil is connected in parallel with a reverse protection circuit for preventing reverse current.

4. A latch control system for a high voltage circuit breaker according to claim 3, wherein a power module for powering the controller is adapted to be connected to a main control power supply of the circuit breaker.

5. The latching control system of a high voltage circuit breaker according to claim 4, wherein the number of the detection relays is 3, and the detection relays are respectively connected in series on the switching-on loop of the 3 phases of the circuit breaker, and the controller respectively samples auxiliary contacts connected with the 3 detection relays.

6. The high-voltage circuit breaker is characterized by comprising a circuit breaker closing loop and a locking control system, wherein the locking control system comprises a detection relay, a locking relay and a controller; the detection relay coil is used for being electrified when the circuit breaker is switched on, so that an auxiliary contact of the detection relay is closed, the auxiliary contact of the detection relay is connected with a controller in a sampling way, and the frequency of the generation of the switching-on signal of the circuit breaker is acquired according to the switching-on signal of the auxiliary contact; the controller is also controlled to be connected with the locking relay, and a normally closed contact of the locking relay is connected with a closing coil of the circuit breaker in series;

When the controller detects that the switching-on signal of the circuit breaker is generated for a set number of times within a set time, the normally closed contact of the locking relay is controlled to be opened, and the circuit breaker is locked.

7. The high voltage circuit breaker of claim 6, wherein the circuit breaker closing circuit is further connected in parallel with an alarm circuit having a normally open contact of a latching relay and an indicator light connected in series.

8. The high voltage circuit breaker of claim 7, wherein the detection relay coil is connected in parallel with a reverse protection circuit for preventing reverse current.

9. The high voltage circuit breaker of claim 8, wherein a power module for powering the controller is for connection to a main power supply of the circuit breaker.

10. The high voltage circuit breaker according to claim 9, wherein the number of the detection relays is 3, and the detection relays are respectively connected in series on the switching-on loop of the 3 phases of the circuit breaker, and the controller respectively samples auxiliary contacts connected with the 3 detection relays.