CN216625276U - A high-voltage circuit breaker opening and closing coil protection device - Google Patents

Abstract

The utility model discloses a high-voltage circuit breaker opening and closing coil protection device, and relates to the field of high-voltage circuit breakers. At present, partial breaker opening and closing coil protection devices are arranged on the market and are connected in series in a secondary circuit, and if the protection devices break down, the circuit breakers can be abnormally stopped. The high-precision clamp type direct current measurement device comprises a high-precision clamp type direct current measurement unit, a data acquisition and processing unit, a power supply module, an output protection node and an output alarm node, wherein the clamp type direct current measurement unit is sleeved on a control loop to realize non-contact induction measurement, the clamp type direct current measurement unit is connected with the data acquisition and processing unit, the output protection node is connected in series on the control loop, and the data acquisition and processing unit is connected with the output protection node and the output alarm node. Through non-contact measurement, when the protection device breaks down, a circuit breaker control circuit is still complete, and the abnormal shutdown condition of the circuit breaker caused by the failure of the circuit breaker can be effectively solved.

Description

A high-voltage circuit breaker opening and closing coil protection device

technical field

The utility model relates to the field of high-voltage circuit breakers, in particular to a high-voltage circuit breaker opening and closing coil protection device.

Background technique

The opening and closing action of the high-voltage circuit breaker mainly relies on the tripping of the opening and closing coil excitation driving iron core to release the energy of the mechanism.

In reality, the opening and closing of circuit breakers are often burnt due to refusal to act or auxiliary contact failures, because the opening and closing coils are designed for short-term energization. Generally, the resistance of the opening and closing coil is tens to hundreds of ohms, and the coil diameter is small and the number of turns is large. Under normal circumstances, the coil charging time does not exceed 5s. When the current in the secondary circuit cannot be cut off normally, the coil will be charged with electricity for a long time, which will generate a lot of heat, causing the coil to burn out.

The indirect cause of the electromagnet burning is the refusal of the circuit breaker to operate, mainly including: the failure of the electromagnet itself, the improper adjustment of the mechanism stroke, the abnormal locking function of the mechanism, the switching of the auxiliary circuit breaker is not in place, the opening and closing, opening and closing when the energy is not stored. Gate circuit voltage is low, etc. The direct reason is that the coil passes a large current for a long time, which causes the coil to overheat and burn.

At present, there are some circuit breaker opening and closing coil protection devices on the market, all of which are used in series in the secondary circuit. If the protection device itself fails, it will cause the circuit breaker to be disabled abnormally.

Utility model content

The technical problem to be solved and the technical task proposed by the utility model are to perfect and improve the existing technical scheme, and to provide a high-voltage circuit breaker opening and closing coil protection device, so as to improve the protection ability of the circuit breaker opening and closing coil to be Purpose. To this end, the present invention adopts the following technical solutions.

A high-voltage circuit breaker opening and closing coil protection device includes a high-precision clamp-type DC measurement unit, a data acquisition and processing unit, a power supply module, an output protection node and an output alarm node, and the clamp-type DC measurement unit is sleeved in a control loop In order to realize non-contact inductive measurement, the clamp-type DC measurement unit is connected with the data acquisition and processing unit to provide measurement data, the output protection node is normally closed, and is connected to the control loop in series. The processing unit is connected with the output protection node to output control signals to realize the opening and closing operations of the output protection node, the data acquisition and processing unit is connected with the output alarm node to output the alarm signal, and the power module is connected with the data acquisition and processing unit to provide power.

In this device, only the output protection node is connected in series in the control circuit of the circuit breaker. Through the non-contact measurement method of the high-precision clamp-type DC measurement unit, the measurement unit is not directly connected in series in the secondary circuit. When the protection device fails, the circuit breaker The control loop is still intact and does not affect the operation of the circuit breaker itself, which can effectively solve the abnormal deactivation of the circuit breaker caused by the refusal of the circuit breaker, or even the opening and closing coils of the circuit breaker are burned, and effectively improve the opening and closing coils of the circuit breaker. protection capability.

As a preferred technical means: the power module is provided with a DC or 220v AC input interface. DC or AC input can be connected according to actual needs, 220v AC is relatively easy to obtain, and the cost is low. The DC power supply can be used in particularly important circuit breakers, and the power module converts the input voltage into the working voltage required by the data acquisition and processing unit.

As a preferred technical means: the output alarm node is connected to a remote monitoring system. It is convenient for remote monitoring. When the protection device fails or loses power, it can realize remote alarm.

As a preferred technical means: the output alarm node is normally open. When the protection device fails or loses power, the alarm is closed.

As a preferred technical means: the data acquisition and processing unit is provided with a delay automatic reset module. The purpose of the delay is to ensure that the closing holding relay or the opening holding relay has no current to return, and the automatic reset is to ensure the possibility of the circuit breaker operating again.

As a preferred technical means: the data acquisition and processing unit is connected with a manual reset button. In the case that the automatic reset is invalid due to the charge blockage in the microcircuit or integrated circuit part of the device, manual reset can be used.

Beneficial effect: In this device, only the output protection node is connected in series in the control circuit of the circuit breaker. Through the non-contact measurement method of the high-precision clamp-type DC measurement unit, the measurement unit is not directly connected in series in the secondary circuit. When the protection device fails , the control circuit of the circuit breaker is still intact and does not affect the operation of the circuit breaker itself, which can effectively solve the abnormal deactivation or even opening of the circuit breaker caused by the refusal of the circuit breaker, and the burning of the closing coil. The protection capability of the closing coil.

Description of drawings

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

FIG. 2 is a schematic diagram of the connection of the present invention in the circuit breaker control circuit.

In the figure: 1. Clamp-type DC measurement unit; 2. Data acquisition and processing unit; 3. Power supply module; 4. Output protection node; 5. Output alarm node.

Detailed ways

The technical solutions of the present utility model will be further described in detail below with reference to the accompanying drawings.

As shown in Figure 1, a high-voltage circuit breaker opening and closing coil protection device includes a high-precision clamp-type DC measurement unit 1, a data acquisition and processing unit 2, a power module 3, an output protection node 4 and an output alarm node 5. The clamp type The DC measurement unit 1 is sleeved on the control loop to realize non-contact inductive measurement, the clamp-type DC measurement unit 1 is connected with the data acquisition and processing unit 2 to provide measurement data, and the output protection node 4 is normally closed, connected in series on the control loop , the data acquisition and processing unit 2 is connected to the output protection node 4 to output control signals to realize the opening and closing operations of the output protection node 4, the data acquisition and processing unit 2 is connected to the output alarm node 5 to output alarm signals, and the power module 3 is connected to the data acquisition The processing unit 2 is connected to provide power.

In order to obtain power relatively easily, the power module 3 is provided with a 220v AC input interface. DC or AC input can be connected according to actual needs. 220v AC is relatively easy to obtain and has a low cost. The power module 3 converts the input voltage into the working voltage required by the data acquisition and processing unit 2 . In addition, different from this example, in a circuit breaker that is particularly important, the power supply module 3 can also use a DC power input module instead of an AC power input module.

In order to realize the remote alarm, the output alarm node 5 is connected to the remote monitoring system. It is convenient for remote monitoring and duty, and when the protection device fails or loses power, it can realize remote alarm.

In this example, the output alarm node 5 is normally open. When the protection device fails or loses power, the alarm is closed.

In order to ensure the possibility of the circuit breaker operating again, the data acquisition and processing unit 2 is provided with a delayed automatic reset module. The purpose of the delay is to ensure that the closing holding relay or the opening holding relay has no current to return, and the automatic reset is to ensure the possibility of the circuit breaker operating again.

In order to realize manual reset, the data acquisition and processing unit 2 is connected with a manual reset button. In the case that the automatic reset is invalid due to the charge blockage in the microcircuit or integrated circuit part of the device, manual reset can be used.

As shown in Figure 2, the circuit breaker control circuit, TQ is the opening coil, HC is the closing coil, DL is the auxiliary node of the circuit breaker, JDT, JDH respectively represent the local opening and closing, YTJ is the remote trip, including remote control Switching and protection tripping, YHJ is remote closing, including remote closing and protection reclosing, TBJ is trip holding relay, HBJ is closing holding relay.

Connect the protection device to the opening and closing control circuit of the circuit breaker.

When the circuit breaker is in normal operation, only a small current flows through the opening or closing circuit, and the protection device will not act. When the circuit breaker operates or acts, its operating current is greater than the starting current value of the device. If the current duration is 2 seconds and is greater than the set value of the protection device for 500 milliseconds, it is judged that the circuit breaker refuses to operate, and the protection device acts instantaneously to cut off the control. circuit to protect the circuit breaker opening or closing coil.

During operation, the clamp-type DC measurement unit 1 is responsible for collecting the current of the circuit breaker opening and closing control loop, and transmits it to the data acquisition and processing unit 2 for its judgment and selection.

The data collection and processing unit 2 makes a comprehensive judgment according to the collected data, and makes an action or no action according to a preset logic.

When the data acquisition and processing unit 2 determines that the circuit breaker refuses to act, it will act immediately, and the output protection node 4 will be disconnected, thereby disconnecting the circuit breaker control circuit, protecting the opening and closing coils, and preventing them from being damaged due to overheating. In order to prevent the protection device from acting repeatedly because the fault is not isolated, the protection node returns according to the set delay.

When the protection device fails due to itself, or the power supply loses power, the output alarm node 5 is closed, and the data acquisition and processing unit 2 is triggered to output an alarm signal to a remote computer monitoring system to realize remote monitoring of unattended stations.

In this device, only the output protection node 4 is connected in series in the control circuit of the circuit breaker. Through the non-contact measurement method of the high-precision clamp-type DC measurement unit 1, the measurement unit is not directly connected in series in the secondary circuit. When the protection device fails, the The control circuit of the circuit breaker is still intact and does not affect the operation of the circuit breaker itself. It can effectively solve the abnormal shutdown or even opening of the circuit breaker caused by the refusal of the circuit breaker, and the burning of the closing coil, effectively improving the opening and closing of the circuit breaker. The protection capability of the brake coil.

A high-voltage circuit breaker opening and closing coil protection device shown in Figures 1-2 above is a specific embodiment of the present utility model, which has already reflected the substantial characteristics and progress of the present utility model. Under the inspiration of the utility model, equivalent modifications in terms of shape and structure are included in the protection scope of this scheme.

Claims (6)

1. The utility model provides a high voltage circuit breaker divide-shut brake coil protection device which characterized in that: comprises a high-precision clamp type direct current measuring unit (1), a data acquisition processing unit (2), a power supply module (3), an output protection node (4) and an output alarm node (5), the clamp type direct current measuring unit (1) is sleeved on a control loop to realize non-contact induction measurement, the clamp type direct current measuring unit (1) is connected with the data acquisition and processing unit (2) to provide measuring data, the output protection node (4) is normally closed and is connected in series with the control loop, the data acquisition and processing unit (2) is connected with the output protection node (4) to output a control signal to realize the opening and closing operation of the output protection node (4), the data acquisition processing unit (2) is connected with the output alarm node (5) to output alarm signals, the power module (3) is connected with the data acquisition and processing unit (2) to provide power.

2. The opening and closing coil protection device for the high-voltage circuit breaker according to claim 1, characterized in that: the power supply module (3) is provided with a direct current or 220v alternating current input interface.

3. The opening and closing coil protection device for the high-voltage circuit breaker according to claim 2, characterized in that: the output alarm node (5) is connected to a remote monitoring system.

4. The opening and closing coil protection device for the high-voltage circuit breaker according to claim 3, characterized in that: the output alarm node (5) is normally open.

5. The opening and closing coil protection device for the high-voltage circuit breaker according to claim 1, characterized in that: the data acquisition and processing unit (2) is provided with a time delay automatic reset module.

6. The opening and closing coil protection device for the high-voltage circuit breaker according to claim 5, wherein: the data acquisition and processing unit (2) is connected with a manual reset button.

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