Circuit breaker control loop broken line fault point positioning device and use method thereof

Abstract

The invention discloses a circuit breaker control loop broken line fault point positioning device and a use method thereof, and the device comprises at least one voltage collection module, and also comprises a centralized control module, a waveform detection module and a display module. Wherein one side of the voltage acquisition module is connected with a control loop, the other side of the voltage acquisition module is connected with the centralized control module, the centralized control module is connected with the display module, and the centralized control module receives voltage acquired by the voltage acquisition module, performs A / D conversion and logic judgment and then displays a result through the display module; the waveform detection module is connected with the control loop and sends multiple paths of waveforms to the control loop, the waveform detection module detects and receives the sent waveforms and then outputs a detection result through the centralized control module, and the detection result is displayed through the display module; the range of the fault point is determined by analyzing the voltage value and the harmonic signal of the wiring point of the control loop at the protection screen, so that an operator can conveniently inform a corresponding team to overhaul, and the workload is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of disconnection detection of a circuit breaker control circuit, and in particular relates to a circuit breaker control circuit disconnection fault point positioning device and a use method thereof. Background Art

[0002] The circuit breaker control circuit is an important part of the relay protection function, which can directly affect the safety and reliability of the power grid operation. If the relay protection control circuit is broken, the circuit breaker will not be able to open and close normally, resulting in protection jump or even grid paralysis.

[0003] Due to the complex structure of the control circuit of the circuit breaker, including all components from the operating power supply to the circuit breaker's opening and closing coils, such as fuses, control switches, contacts and coils of intermediate relays, there are many factors that may cause line breakage failures, such as loose terminals from the protection screen to the tripping and closing coils, damage to the opening / closing coils, damage to the secondary cables from the protection screen to the terminal box and the mechanism box, and the remote / local handle being cut to the local position at the mechanism box. During maintenance, different faults are assigned to different maintenance teams according to their fault locations. However, when problems occur in the control circuit, the operating personnel cannot quickly locate the scope of the fault point, and can only notify the primary side maintenance team and the secondary side maintenance team to arrive at the site to handle the problem at the same time. In the context of increasingly sophisticated maintenance work, clear division of responsibilities, and increasingly heavy work at the State Grid Corporation, if only one side of the primary or secondary side fails, and two teams deal with the same problem at the same time, it will lead to a waste of human resources and increase the workload of maintenance personnel.

[0004] Therefore, in order to solve the above problems, it is necessary to develop a circuit breaker control circuit disconnection fault point locating device and a method for using the same. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a circuit breaker control circuit break fault point locating device and its use method. By analyzing the voltage value and harmonic signal of the control circuit connection point at the protection screen, the range of the fault point is determined, which is convenient for the operating personnel to notify the corresponding team to carry out maintenance and reduce the workload.

[0006] The objective of the present invention is achieved as follows: A device for locating a fault point of a circuit breaker control circuit disconnection, comprising at least one voltage acquisition module, and also comprising a centralized control module, a waveform detection module and a display module; wherein one side of the voltage acquisition module is connected to the control circuit, and the other side of the voltage acquisition module is connected to the centralized control module, and the centralized control module is connected to a display module, and the centralized control module receives the voltage collected by the voltage acquisition module and performs A / D conversion and logic judgment, and then displays the result through the display module; the waveform detection module is connected to the control circuit, and sends multiple waveforms to the control circuit, and the waveform detection module outputs the detection result through the centralized control module after receiving the waveform detection sent, and displays it through the display module.

[0007] Furthermore, it also includes a power supply module, and the power supply module adopts a 220V AC power supply.

[0008] Furthermore, the centralized control module adopts an ICL7106 centralized control chip, and the display module adopts an LCD liquid crystal display.

[0009] Furthermore, the voltage acquisition module is set to two, including a first voltage acquisition module and a second voltage acquisition module, wherein one side of the first voltage acquisition module is connected to the control loop through wiring point 1 and wiring point 2, one side of the second voltage acquisition module is connected to the control loop through wiring point 3 and wiring point 4, and the other sides of the first voltage acquisition module and the second voltage acquisition module are respectively connected to the input end of the centralized control module.

[0010] Furthermore, the waveform detection module includes a signal transmitting circuit and a signal receiving circuit, the signal transmitting circuit is connected to the control loop through wiring point 3 and wiring point 4, the signal receiving circuit is connected to the control loop through wiring point 2, and the signal receiving circuit is connected to the centralized control module; the signal transmitting circuit sends waveforms of different shapes to the control loop through wiring point 3 and wiring point 4 for detection, and the signal receiving circuit receives the waveform through wiring point 2 and sends it to the centralized control module.

[0011] Furthermore, the detection waveform signal emitted by the waveform detection module is a harmonic signal different from the fundamental wave.

[0012] Furthermore, it also includes an insulating shell, on which is provided a display screen, an opening and closing indicator, a voltage detection switch, a waveform detection switch and a wiring point plug-in port, the wiring point plug-in port includes wiring point 1, wiring point 2, wiring point 3, wiring point 4 and a grounding plug-in port, and a power plug-in port is also provided on one side of the insulating shell.

[0013] A method for using a device for locating a disconnection fault point of a circuit breaker control circuit, comprising the following steps: (1) Voltage detection: ① Disconnect the connection between the protection screen and the mechanism box, and measure the voltage value of the connection point 1 to the connection point 4 close to the protection screen; ② When the circuit breaker is closed, if the connection point 1 is positive, the connection point 2 is negative, the connection point 3 is positive, and the connection point 4 is negative, the alarm will be “normal voltage output”, otherwise it will be “abnormal voltage output, fault on the protection side”; ③ When the circuit breaker is in open position, if the connection point 1 is positive, the connection point 2 is negative, the connection point 3 is negative, and the connection point 4 is positive, the alarm will be “normal voltage output”, otherwise the alarm will be “abnormal voltage output, fault on the protection side”; (2) Waveform detection: ① Disconnect the connection between the protection screen and the mechanism box, send waveforms of different shapes through wiring points 3 and 4, and detect and receive through wiring point 2; ② If the received waveform is consistent with the wiring point 4, and the waveform of the wiring point 3 is not received, it will report "the control circuit is normal", otherwise it will report "the control circuit is abnormal, the fault point is on the mechanism side".

[0014] Due to the adoption of the above technical scheme, the beneficial effects of the present invention are as follows: by providing a voltage detection module, four voltages can be detected simultaneously, and the centralized control module can be used to independently determine whether the control circuit voltage is normal, and by providing a waveform detection module, it has a multi-channel harmonic emission and detection function, and the detection result has high reliability, and can automatically identify the general range of the fault point according to the detection result. The operating personnel do not need to have a high level of corresponding control circuit theoretical knowledge to quickly determine the fault location, and can help the operating personnel distinguish which maintenance team the fault point belongs to, so that the operating personnel can notify the corresponding team for maintenance, thereby reducing the workload of another team. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a principle block diagram of the present invention.

[0016] Figure 2 It is a circuit schematic diagram of the voltage acquisition module and the centralized control module in the present invention.

[0017] Figure 3 It is a schematic diagram of control circuit wiring in the present invention.

[0018] Figure 4 It is a front view and a side view of the insulating housing in the present invention. Implementation

[0019] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0020] like Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, a circuit breaker control circuit break fault point locating device includes at least one voltage acquisition module, a centralized control module, a waveform detection module and a display module, and also includes a power module. The power module adopts a 220V AC power supply. Preferably, the centralized control module adopts an ICL7106 centralized control chip, and the display module adopts an LCD liquid crystal display.

[0021] Among them, one side of the voltage acquisition module is connected to the control loop, and the other side of the voltage acquisition module is connected to the centralized control module. The centralized control module is connected to a display module. The centralized control module receives the voltage collected by the voltage acquisition module and performs A / D conversion and logic judgment, and then displays the result through the display module; specifically, the voltage acquisition module is set to two, including a first voltage acquisition module and a second voltage acquisition module, wherein, specifically as Figure 2 and Figure 3 As shown, one side of the first voltage acquisition module is connected to the control loop through wiring point 1 and wiring point 2, and one side of the second voltage acquisition module is connected to the control loop through wiring point 3 and wiring point 4. The other sides of the first voltage acquisition module and the second voltage acquisition module are respectively connected to the input end of the centralized control module.

[0022] Among them, the waveform detection module is connected to the control loop and sends multiple waveforms to the control loop. After receiving the waveform detection, the waveform detection module outputs the detection result through the centralized control module and displays it through the display module; specifically, the waveform detection module includes a signal transmitting circuit and a signal receiving circuit, the signal transmitting circuit is connected to the control loop through wiring point 3 and wiring point 4, the signal receiving circuit is connected to the control loop through wiring point 2, and the signal receiving circuit is connected to the centralized control module; the signal transmitting circuit sends waveforms of different shapes to the control loop through wiring point 3 and wiring point 4 for detection, and the signal receiving circuit receives the waveform through wiring point 2 and sends it to the centralized control module; preferably, the detection waveform signal emitted by the waveform detection module is a harmonic signal different from the fundamental wave, which is easy to identify.

[0023] Among them, Figure 4 As shown, it also includes an insulating shell, on which a display screen, an opening and closing indicator, a voltage detection switch, a waveform detection switch and a wiring point plug-in port are provided. The wiring point plug-in port includes wiring point 1, wiring point 2, wiring point 3, wiring point 4 and a grounding plug-in port. A power plug-in port is also provided on one side of the insulating shell.

[0024] A method for using a device for locating a disconnection fault point of a circuit breaker control circuit, comprising the following steps: (1) Voltage detection: ① Disconnect the connection between the protection screen and the mechanism box, and measure the voltage value of the connection point 1 to the connection point 4 close to the protection screen; ② When the circuit breaker is closed, if the connection point 1 is positive, the connection point 2 is negative, the connection point 3 is positive, and the connection point 4 is negative, the alarm will be “normal voltage output”, otherwise it will be “abnormal voltage output, fault on the protection side”; ③ When the circuit breaker is in open position, connection point 1 is positive, connection point 2 is negative, connection point 3 is negative, connection point 4 is positive, and "voltage output is normal" is reported; otherwise, "voltage output is abnormal, the fault is on the protection side" is reported.

[0025] (2) Waveform detection: ① Disconnect the connection between the protection screen and the mechanism box, send waveforms of different shapes through wiring points 3 and 4, and detect and receive through wiring point 2; ② If the received waveform is consistent with the wiring point 4, and the waveform of the wiring point 3 is not received, it will report "the control circuit is normal", otherwise it will report "the control circuit is abnormal, the fault point is on the mechanism side".

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific implementation modes of the present invention can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A device for locating a disconnection fault point of a circuit breaker control circuit, characterized in that: It includes at least one voltage acquisition module, and also includes a centralized control module, a waveform detection module and a display module; wherein, one side of the voltage acquisition module is connected to the control loop, and the other side of the voltage acquisition module is connected to the centralized control module, and the centralized control module is connected to the display module. The centralized control module receives the voltage collected by the voltage acquisition module and performs A / D conversion and logic judgment, and then displays the result through the display module; the waveform detection module is connected to the control loop, and sends multiple waveforms to the control loop. After receiving the waveform detection, the waveform detection module outputs the detection result through the centralized control module, and displays it through the display module.

2. A circuit breaker control circuit disconnection fault point locating device according to claim 1, characterized in that: It also includes a power supply module, which uses a 220V AC power supply.

3. A circuit breaker control circuit disconnection fault point locating device according to claim 1, characterized in that: The centralized control module adopts the ICL7106 centralized control chip, and the display module adopts an LCD liquid crystal display.

4. A circuit breaker control circuit disconnection fault point locating device according to claim 1, characterized in that: The voltage acquisition module is set to two, including a first voltage acquisition module and a second voltage acquisition module, wherein one side of the first voltage acquisition module is connected to the control loop through wiring point 1 and wiring point 2, one side of the second voltage acquisition module is connected to the control loop through wiring point 3 and wiring point 4, and the other sides of the first voltage acquisition module and the second voltage acquisition module are respectively connected to the input end of the centralized control module.

5. A circuit breaker control circuit disconnection fault point locating device according to claim 1, characterized in that: The waveform detection module includes a signal transmitting circuit and a signal receiving circuit, the signal transmitting circuit is connected to the control loop through wiring point 3 and wiring point 4, the signal receiving circuit is connected to the control loop through wiring point 2, and the signal receiving circuit is connected to the centralized control module; the signal transmitting circuit sends waveforms of different shapes to the control loop through wiring point 3 and wiring point 4 for detection, and the signal receiving circuit receives the waveform through wiring point 2 and sends it to the centralized control module.

6. A circuit breaker control circuit disconnection fault point locating device according to claim 1, characterized in that: The detection waveform signal emitted by the waveform detection module is a harmonic signal different from the fundamental wave.

7. A device for locating a disconnection fault point of a circuit breaker control circuit according to any one of claims 1 to 6, characterized in that: It also includes an insulating shell, on which is provided a display screen, an opening and closing indicator, a voltage detection switch, a waveform detection switch and a wiring point plug-in port. The wiring point plug-in port includes wiring point 1, wiring point 2, wiring point 3, wiring point 4 and a grounding plug-in port. A power plug-in port is also provided on one side of the insulating shell.

8. A method for using a device for locating a disconnection fault point in a circuit breaker control circuit, characterized in that: The following steps are involved: (1) Voltage detection: ① Disconnect the connection between the protection screen and the mechanism box, and measure the voltage value of the connection point 1 to the connection point 4 close to the protection screen; ② When the circuit breaker is closed, if the connection point 1 is positive, the connection point 2 is negative, the connection point 3 is positive, and the connection point 4 is negative, the alarm will be "normal voltage output", otherwise it will be "abnormal voltage output, fault on the protection side"; ③ When the circuit breaker is in open position, if the connection point 1 is positive, the connection point 2 is negative, the connection point 3 is negative, and the connection point 4 is positive, the alarm will be "normal voltage output", otherwise it will be "abnormal voltage output, fault on the protection side"; (2) Waveform detection: ① Disconnect the connection between the protection screen and the mechanism box, send waveforms of different shapes through wiring points 3 and 4, and detect and receive through wiring point 2; ② If the received waveform is consistent with the wiring point 4, and the waveform of the wiring point 3 is not received, it will report "the control circuit is normal", otherwise it will report "the control circuit is abnormal, the fault point is on the mechanism side".

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