Novel circuit breaker vacuum arc-extinguishing chamber contact wear on-line monitoring device

Abstract

The utility model discloses a novel on-line monitoring device for contact abrasion of a vacuum arc-extinguishing chamber of a circuit breaker. Comprising an A-phase displacement sensor, a B-phase displacement sensor, a C-phase displacement sensor, an A-phase displacement sensor signal conditioning circuit, a B-phase displacement sensor signal conditioning circuit, a C-phase displacement sensor signal conditioning circuit, an A-phase vibration sensor, a B-phase vibration sensor, a C-phase vibration sensor, a microprocessor module, a power supply module and an opening command input module. A closing command input module; and a communication module. According to the utility model, the vibration sensor is arranged at the lower end of the connecting rod of the circuit breaker to judge the just-open point and the just-close point, and the displacement sensor is arranged between the connecting rod and the chassis to monitor the relative total stroke of the moving and static contacts of the circuit breaker, so as to obtain the opening distance and the over travel of the moving and static contacts of the circuit breaker and judge the wear condition of the moving and static contacts of the circuit breaker according to the change of the over travel.

Description

Technical Field

[0001] The utility model relates to an on-line monitoring device for contact wear of a new type of circuit breaker vacuum interrupter, belonging to the technical field of power equipment monitoring. Background Technique

[0002] During the actual use of a high-voltage circuit breaker, the contacts of the circuit breaker vacuum interrupter are often worn under the mechanical force of the opening and closing springs. When the contacts of the circuit breaker vacuum interrupter are severely worn, the over-travel will decrease. The decrease in over-travel will lead to a reduction in the contact area of the interrupter contacts, thereby increasing the contact resistance. When the circuit breaker conducts a large current, due to the increase in resistance, heat will be generated at the contact of the contacts, ultimately leading to the burning of the circuit breaker. For an operating circuit breaker, due to the limitations of the circuit breaker's use environment, it is currently impossible to achieve on-line monitoring of the contact wear of the circuit breaker vacuum interrupter. Content of the Utility Model

[0003] In order to overcome the above deficiencies, the utility model proposes an on-line monitoring device for contact wear of a new type of circuit breaker vacuum interrupter to solve the above problems.

[0004] The utility model aims to provide an on-line monitoring device capable of real-time monitoring of the contact wear of a circuit breaker vacuum interrupter. Through vibration and displacement sensing technologies, it can accurately judge the contact wear state, provide a scientific basis for the maintenance and replacement of the circuit breaker, and ensure the safe and stable operation of the power grid.

[0005] The technical solution of the utility model is as follows:

[0006] An on-line monitoring device for contact wear of a new type of circuit breaker vacuum interrupter includes a phase A displacement sensor, a phase B displacement sensor, a phase C displacement sensor, a phase A displacement sensor signal conditioning circuit, a phase B displacement sensor signal conditioning circuit, a phase C displacement sensor signal conditioning circuit, a phase A vibration sensor, a phase B vibration sensor, a phase C vibration sensor, a microprocessor module, a power supply module, a tripping command input module, a closing command input module, and a communication module;

[0007] The output ends of the phase A displacement sensor, the phase B displacement sensor, and the phase C displacement sensor are respectively connected to the input ends of the phase A displacement sensor signal conditioning circuit, the phase B displacement sensor signal conditioning circuit, and the phase C displacement sensor signal conditioning circuit; the output ends of the phase A displacement sensor signal conditioning circuit, the phase B displacement sensor signal conditioning circuit, and the phase C displacement sensor signal conditioning circuit are respectively connected to the corresponding input A / D ports of the microprocessor module;

[0008] The output ends of the phase A vibration sensor, the phase B vibration sensor, and the phase C vibration sensor are respectively connected to the corresponding I / O ports of the microprocessor module;

[0009] The output terminals of the opening command input module and the closing command input module are respectively connected to the corresponding input I / O ports of the microprocessor module;

[0010] The output terminal of the power supply module is connected to the corresponding power supply terminal of the microprocessor module;

[0011] The input terminal of the communication module is connected to the corresponding communication interface of the microprocessor module.

[0012] Preferably, the above-mentioned A-phase displacement sensor, B-phase displacement sensor, and C-phase displacement sensor respectively adopt 10Ω slide wire resistors. The length of the slide wire resistor is 50mm. The slide wire resistor is fixed on the breaker base, and the handle of the slide wire resistor is driven by the breaker connecting rod to move up and down during opening and closing.

[0013] Preferably, the above-mentioned A-phase displacement sensor signal conditioning circuit, B-phase displacement sensor signal conditioning circuit, and C-phase displacement sensor signal conditioning circuit adopt a resistor voltage division circuit. A 10kΩ slide wire displacement sensor and a 10kΩ standard resistor are connected in series, and a 3.3VDC voltage is applied across them. The change in the resistance value of the 10kΩ slide wire displacement sensor is converted into a changing voltage signal, and the change in the resistance value of the 10kΩ slide wire displacement sensor corresponds one-to-one with the displacement.

[0014] Preferably, the above-mentioned A-phase vibration sensor, B-phase vibration sensor, and C-phase vibration sensor all adopt LDTO-028K cantilever beam structure thin film vibration sensors. One end leads out a signal through a terminal, and the other end is fixed with a mass block. It is a vibration sensor that can generate high sensitivity at low frequencies. When in use, it is installed at the lower end of the breaker pull rod. When the moving and static contacts are separated instantaneously during breaker opening and closing, a vibration signal is generated, which will cause the LDTO-028K cantilever beam structure thin film vibration sensor to deviate from the mechanical natural axis. The bending can generate high stress in the piezoelectric polymer, thereby generating a high voltage output.

[0015] Preferably, the above-mentioned microprocessor module adopts an STM32 microprocessor chip.

[0016] Preferably, the above-mentioned opening command input module and closing command input module both adopt non-contact switches, which are introduced by the breaker opening and closing auxiliary contacts.

[0017] Preferably, the above-mentioned power supply module adopts a 110 - 220VAC / DC switching power supply module to output 5VDC voltage, and then a 5VDC to 3.3V voltage conversion module.

[0018] Preferably, the above-mentioned communication module adopts an RS485 module for remote transmission of monitoring data information.

[0019] The beneficial effects of the present utility model are:

[0020] 1. Online monitoring of the contact wear condition of the vacuum interrupter of the circuit breaker is realized, improving the reliability and safety of power grid operation.

[0021] 2. Through vibration and displacement sensing technologies, the contact wear state can be accurately judged, providing a scientific basis for the maintenance and replacement of the circuit breaker.

[0022] 3. The device has a simple structure, is easy to install, and is easy to integrate into the existing power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the system block diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present utility model will be further described below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model and should not be used to limit the protection scope of the present utility model.

[0025] As Figure 1 shown, a novel on-line monitoring device for contact wear of the vacuum interrupter of a circuit breaker includes a phase A displacement sensor, a phase B displacement sensor, a phase C displacement sensor, a phase A displacement sensor signal conditioning circuit, a phase B displacement sensor signal conditioning circuit, a phase C displacement sensor signal conditioning circuit, a phase A vibration sensor, a phase B vibration sensor, a phase C vibration sensor, a microprocessor module, a power supply module, a tripping command input module, a closing command input module, and a communication module;

[0026] The output ends of the phase A displacement sensor, the phase B displacement sensor, and the phase C displacement sensor are respectively connected to the input ends of the phase A displacement sensor signal conditioning circuit, the phase B displacement sensor signal conditioning circuit, and the phase C displacement sensor signal conditioning circuit; the output ends of the phase A displacement sensor signal conditioning circuit, the phase B displacement sensor signal conditioning circuit, and the phase C displacement sensor signal conditioning circuit are respectively connected to the corresponding A / D ports of the input ends of the microprocessor module;

[0027] The output ends of the phase A vibration sensor, the phase B vibration sensor, and the phase C vibration sensor are respectively connected to the corresponding I / O ports of the microprocessor module;

[0028] The output ends of the tripping command input module and the closing command input module are respectively connected to the corresponding I / O ports of the input ends of the microprocessor module;

[0029] The output end of the power supply module is connected to the corresponding power supply end of the microprocessor module;

[0030] The input end of the communication module is connected to the corresponding communication interface of the microprocessor module.

[0031] Preferably, the above-mentioned A-phase displacement sensor, B-phase displacement sensor, and C-phase displacement sensor respectively adopt 10Ω slide wire resistors. The length of the slide wire resistor is 50mm. The slide wire resistor is fixed on the circuit breaker base, and the handle of the slide wire resistor is driven by the circuit breaker connecting rod to move up and down when the circuit breaker is switched on and off.

[0032] Preferably, the above-mentioned signal conditioning circuits of the A-phase displacement sensor, B-phase displacement sensor, and C-phase displacement sensor adopt resistor voltage division circuits. A 10kΩ slide wire displacement sensor and a 10kΩ standard resistor are connected in series, and a 3.3VDC voltage is applied across them. The change in the resistance value of the 10kΩ slide wire displacement sensor is converted into a changing voltage signal, and the change in the resistance value of the 10kΩ slide wire displacement sensor corresponds one-to-one with the displacement.

[0033] Preferably, the above-mentioned A-phase vibration sensor, B-phase vibration sensor, and C-phase vibration sensor all adopt LDTO-028K cantilever beam structure thin film vibration sensors. One end leads out a signal through a terminal, and the other end is fixed with a mass block. It is a vibration sensor that can generate high sensitivity at low frequencies. When in use, it is installed at the lower end of the circuit breaker pull rod. At the moment when the circuit breaker is switched on and off, when the moving and static contacts are separated instantaneously to generate a vibration signal, it will cause the LDTO-028K cantilever beam structure thin film vibration sensor to deviate from the mechanical natural axis, and the bending can generate high stress in the piezoelectric polymer, thereby generating a high voltage output.

[0034] Preferably, the above-mentioned microprocessor module adopts an STM32 microprocessor chip.

[0035] Preferably, the above-mentioned opening command input module and closing command input module both adopt non-contact switches, which are introduced by the auxiliary contacts of the circuit breaker for opening and closing.

[0036] Preferably, the above-mentioned power supply module adopts a 110 - 220VAC / DC switching power supply module to output 5VDC voltage, and then a 5VDC to 3.3V voltage conversion module.

[0037] Preferably, the above-mentioned communication module adopts an RS485 module for remote transmission of monitoring data information.

[0038] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. An on-line monitoring device for contact wear of a new type of vacuum interrupter of a circuit breaker, characterized in that, It includes a phase-A displacement sensor, a phase-B displacement sensor, a phase-C displacement sensor, a phase-A displacement sensor signal conditioning circuit, a phase-B displacement sensor signal conditioning circuit, a phase-C displacement sensor signal conditioning circuit, a phase-A vibration sensor, a phase-B vibration sensor, a phase-C vibration sensor, a microprocessor module, a power supply module, a trip command input module, a close command input module, and a communication module; The output terminals of the phase-A displacement sensor, the phase-B displacement sensor, and the phase-C displacement sensor are respectively connected to the input terminals of the phase-A displacement sensor signal conditioning circuit, the phase-B displacement sensor signal conditioning circuit, and the phase-C displacement sensor signal conditioning circuit; the output terminals of the phase-A displacement sensor signal conditioning circuit, the phase-B displacement sensor signal conditioning circuit, and the phase-C displacement sensor signal conditioning circuit are respectively connected to the corresponding A / D ports of the input terminals of the microprocessor module; The output terminals of the phase-A vibration sensor, the phase-B vibration sensor, and the phase-C vibration sensor are respectively connected to the corresponding I / O ports of the microprocessor module; The output terminals of the trip command input module and the close command input module are respectively connected to the corresponding I / O ports of the input terminals of the microprocessor module; The output terminal of the power supply module is connected to the corresponding power supply terminal of the microprocessor module; The input terminal of the communication module is connected to the corresponding communication interface of the microprocessor module.

2. The on-line monitoring device for contact wear of the vacuum interrupter of a new type of circuit breaker according to claim 1, characterized in that, The phase-A displacement sensor, the phase-B displacement sensor, and the phase-C displacement sensor respectively adopt 10Ω slide wire resistors. The length of the slide wire resistor is 50mm. The slide wire resistor is fixed on the circuit breaker base, and the handle of the slide wire resistor is driven to move up and down by the circuit breaker connecting rod during opening and closing.

3. The on-line monitoring device for the contact wear of the vacuum interrupter of a new type of circuit breaker according to claim 1, characterized in that, The phase-A displacement sensor signal conditioning circuit, the phase-B displacement sensor signal conditioning circuit, and the phase-C displacement sensor signal conditioning circuit adopt a resistance voltage division circuit. A 10kΩ slide wire displacement sensor and a 10kΩ standard resistor are connected in series, and a 3.3VDC voltage is applied across their two ends. The change in the resistance value of the 10kΩ slide wire displacement sensor is converted into a changing voltage signal, and the change in the resistance value of the 10kΩ slide wire displacement sensor corresponds one-to-one with the displacement.

4. The on-line monitoring device for contact wear of the vacuum interrupter of a new type of circuit breaker according to claim 1, characterized in that, The phase-A vibration sensor, the phase-B vibration sensor, and the phase-C vibration sensor all adopt LDTO-028K cantilever beam structure thin film vibration sensors. One end leads out a signal through a terminal, and the other end is fixed with a mass block.

5. The on-line monitoring device for the contact wear of the vacuum interrupter of a new type of circuit breaker according to claim 1, characterized in that, The microprocessor module adopts an STM32 microprocessor chip.

6. The on-line monitoring device for the contact wear of the vacuum interrupter of a novel circuit breaker according to claim 1, characterized in that, The trip command input module and the close command input module both adopt non-contact switches, which are introduced by the auxiliary contacts of the circuit breaker during opening and closing.

7. The on-line monitoring device for the contact wear of the vacuum interrupter of a new type of circuit breaker according to claim 1, characterized in that The power supply module adopts a 110 - 220VAC / DC switching power supply module to output 5VDC voltage, and then a 5VDC to 3.3V voltage conversion module.

8. The on-line monitoring device for the contact wear of the vacuum interrupter of a new type of circuit breaker according to claim 1, characterized in that The communication module adopts an RS485 module for remotely transmitting the monitored data information.

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