GCB secondary element state detection device

Abstract

A kind of GCB secondary element state detection device, a kind of GCB secondary element state detection device, it includes excitation signal unit, contact signal unit, central control unit, host computer analysis display unit;Excitation signal unit is electrically connected with AC / DC power supply;Contact signal unit is electrically connected with isolated power supply;Central control unit is electrically connected with host computer analysis display unit, contact signal unit, excitation signal unit, four-way signal conversion acquisition unit and eight-way signal conversion acquisition unit respectively.Not to be disassembled verification, complete performance of the relay to be detected is reflected, reduce unplanned power outage time;Based on the action parameter of commonly used relay, the power parameters of the verification device are designed, one-key measurement of all parameters of the relay is realized, and the detection requirements of various relays in secondary circuit of switch type equipment mechanism are covered.

Description

Technical Field

[0001] This utility model belongs to the field of offline detection technology of generator outlet circuit breaker body status, and relates to a GCB secondary component status detection device. Background Technology

[0002] The generator circuit breaker (GCB), installed between the generator and the main transformer, plays a crucial control and protection role in hydropower stations. GCB failures primarily occur in three areas: the operating mechanism, the arc-extinguishing chamber, and secondary components. Currently, GCB overhaul cycles are mainly determined based on operating time, cumulative breaking coefficient, and cumulative number of operations. Before overhauls, there are no effective means to comprehensively assess its condition. With the deepening implementation of condition-based maintenance, it is necessary to conduct in-depth research on GCB offline condition monitoring technology to obtain more comprehensive detection characteristics and test data reflecting its health status, thereby enabling effective assessment of the GCB's condition and providing technical support for its operation and maintenance.

[0003] GCB secondary components are key parts in control circuits, including relay coils, energy storage motor windings, and opening / closing coils. Operating under harsh conditions of high heat, high humidity, vibration, dust, and electromagnetic interference, GCB secondary components are affected by factors such as harsh electromagnetic environments, severe outdoor atmospheric conditions, and mechanical stress. Over long-term operation, the relay contacts may oxidize or ablate, causing changes in relay operating voltage, operating time, and contact resistance, resulting in unreliable operation and severely impacting the reliability of switching equipment.

[0004] Currently, non-dedicated instruments such as "relay protection calibrators" and "mechanical characteristic testers" are commonly used in field inspections of relays. These instruments can only measure a limited number of parameters, such as operating time and operating voltage. Furthermore, existing operating time and voltage measuring devices are limited in their application to different types of relays and lack specific optimization for relay operating characteristics and detection features. When measuring operating characteristics, the opening and closing states of relay contacts are determined using either switching or fixed potential methods to obtain operating characteristic parameters. This approach does not fully reflect the opening and closing process of the contacts, cannot adequately evaluate the opening and closing performance of the contacts, and cannot test the characteristics of the relay coil and the contact performance of the contacts. Consequently, it cannot fully reflect the overall performance of the relay and lacks scientific state evaluation parameters and methods. There is a lack of longitudinal and lateral data available for analysis and comparison to determine whether the relay's operation is reliable. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a GCB secondary component status detection device that can perform verification without disassembly, fully reflect the overall performance of the relay being tested, and reduce unplanned power outage time.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a GCB secondary component status detection device, which includes an excitation signal unit, a contact signal unit, a central control unit, and a host computer analysis and display unit; the excitation signal unit is electrically connected to an AC / DC power supply; the contact signal unit is electrically connected to an isolation power supply; the central control unit is electrically connected to the host computer analysis and display unit, the contact signal unit, the excitation signal unit, the four-channel signal conversion and acquisition unit, and the eight-channel signal conversion and acquisition unit, respectively.

[0007] The AC / DC power supply and the four-channel signal conversion and acquisition unit are all connected to the excitation source signal terminal.

[0008] The isolated power supply and the eight-channel signal conversion and acquisition unit are both connected to the contact signal terminals.

[0009] The excitation signal unit is used to excite the relay coil, and the switching control adopts MOSFET control.

[0010] The AC / DC power supply is an AC / DC output turbulent signal power supply. The DC voltage source is adjustable from 0 to 250V with a maximum resistive current of 100mA. The DC current source is adjustable from 0 to 4A with an open voltage of 10V.

[0011] The signal output control of the contact signal unit is completed by the central control unit, which transforms, conditions and collects the voltage between the contacts and the current flowing through the contacts.

[0012] The isolated power supply consists of eight isolated 6V channels, namely a 600Ω current-limiting / 10mA constant voltage source and a 6V / 1A constant current source.

[0013] The main beneficial effects of this utility model are as follows: By optimizing the size and reducing the weight of the relay detection device, the device body is miniaturized and lightweight, offering advantages such as portability, intelligent operation, user-friendly interface, and flexible output modes.

[0014] Based on commonly used relay operating parameters, the power supply parameters of the calibration device are designed to achieve one-click measurement of all relay parameters, covering the testing requirements of various relays in the secondary circuit of switchgear.

[0015] Based on the research on secondary circuit relays of switchgear, the function will be extended to transformer secondary circuit relays, relay protection system relays, and even all relays in the entire station, so as to realize the universality of relay testing for one machine and the entire station.

[0016] Based on the measurement results, parameters such as the relay's operating voltage, operating time, contact resistance, and coil insulation status can be obtained, enabling comprehensive detection and evaluation of the secondary relay's operating characteristics, contact characteristics, and secondary coil insulation status. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a structural diagram of the present invention.

[0019] Figure 2 This is a simplified diagram of the AC / DC power supply of this utility model.

[0020] Figure 3 This is a sample diagram of the contact signal test of this utility model.

[0021] The diagram is labeled as follows: Excitation signal unit 1; Contact signal unit 2; Central control unit 3; Host computer analysis and display unit 4; AC / DC power supply 5; Isolation power supply 6; Four-channel signal conversion and acquisition unit 7; Eight-channel signal conversion and acquisition unit 8; Excitation source signal terminal 9; Contact signal terminal 10. Detailed Implementation

[0022] like Figures 1-3 A GCB secondary component status detection device includes an excitation signal unit 1, a contact signal unit 2, a central control unit 3, and a host computer analysis and display unit 4. The excitation signal unit 1 is electrically connected to an AC / DC power supply 5. The contact signal unit 2 is electrically connected to an isolation power supply 6. The central control unit 3 is electrically connected to the host computer analysis and display unit 4, the contact signal unit 2, the excitation signal unit 1, a four-channel signal conversion and acquisition unit 7, and an eight-channel signal conversion and acquisition unit 8, respectively.

[0023] In the preferred embodiment, both the AC / DC power supply 5 and the four-channel signal conversion and acquisition unit 7 are connected to the excitation source signal terminal 9.

[0024] In the preferred embodiment, both the isolation power supply 6 and the eight-channel signal conversion and acquisition unit 8 are connected to the contact signal terminal 10.

[0025] In the preferred embodiment, the excitation signal unit 1 is used to excite the relay coil, and the switching control adopts MOSFET control. Using MOSFET control improves the reliability of output switching and avoids signal interference.

[0026] In the preferred embodiment, the AC / DC power supply 5 is an AC / DC output induced current signal power supply. The DC voltage source has an adjustable output of 0–250V and a maximum resistive current of 100mA. The DC current source has an adjustable output of 0–4A and an open-circuit voltage of 10V. The DC voltage source is used to excite the relay voltage coil, and the DC current source is used to excite the relay current coil.

[0027] In the preferred embodiment, the signal output control of the contact signal unit 2 is completed by the central control unit 3, which transforms, conditions and collects the voltage between the contacts and the current flowing through the contacts.

[0028] In the preferred embodiment, the isolated power supply 6 consists of eight isolated 6V sources, namely a 600Ω current-limiting / 10mA constant voltage source and a 6V / 1A constant current source.

[0029] The above technical solution employs a quick-connection method to enable in-operation relay testing without disconnecting the relays. It also performs full-circuit testing on critical functional circuits of electrical equipment, including alarms, interlocks, hydraulic pressure, and pneumatic pressure circuits.

[0030] This invention addresses the problem that in actual relay performance testing, the use of non-dedicated instruments to inspect relays lacks specific optimization for relay operating characteristics and testing features, resulting in insufficient testable parameters and a limited range of relay types supported by existing measuring devices. It supports non-disassembly calibration, fully reflecting the overall performance of the relay under test and reducing unplanned power outage time.

[0031] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The embodiments and features described in this application can be arbitrarily combined without conflict. The protection scope of this utility model should be defined as the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A GCB secondary component status detection device, characterized in that: It includes an excitation signal unit (1), a contact signal unit (2), a central control unit (3), and a host computer analysis and display unit (4); the excitation signal unit (1) is electrically connected to an AC / DC power supply (5); the contact signal unit (2) is electrically connected to an isolation power supply (6); the central control unit (3) is electrically connected to the host computer analysis and display unit (4), the contact signal unit (2), the excitation signal unit (1), the four-channel signal conversion and acquisition unit (7), and the eight-channel signal conversion and acquisition unit (8), respectively.

2. The GCB secondary component status detection device according to claim 1, characterized in that: The AC / DC power supply (5) and the four-channel signal conversion and acquisition unit (7) are both connected to the excitation source signal terminal (9).

3. The GCB secondary component status detection device according to claim 1, characterized in that: The isolation power supply (6) and the eight-channel signal conversion and acquisition unit (8) are both connected to the contact signal terminal (10).

4. The GCB secondary component status detection device according to claim 1, characterized in that: The excitation signal unit (1) is used to excite the relay coil, and the switching control adopts MOSFET control.

5. The GCB secondary component status detection device according to claim 1, characterized in that: The AC / DC power supply (5) is an AC / DC output turbulent signal power supply. The DC voltage source is adjustable from 0 to 250V, with a maximum resistive current of 100mA. The DC current source is adjustable from 0 to 4A, with an opening voltage of 10V.

6. The GCB secondary component status detection device according to claim 1, characterized in that: The signal output control of the contact signal unit (2) is completed by the central control unit (3), which transforms, conditions and collects the voltage between the contacts and the current flowing through the contacts.

7. The GCB secondary component status detection device according to claim 1, characterized in that: The isolated power supply (6) consists of eight isolated 6V channels, namely a 600Ω current-limiting / 10mA constant voltage source and a 6V / 1A constant current source.

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