Explosion-proof electrical switch major loop contact performance detection system

Abstract

The utility model relates to an explosion-proof electrical switch major loop contact performance detection system, which is characterized in that a power supply end cable passes through an input signal detector and is connected with a terminal L1, and the output end of the input signal detector is connected with a signal preprocessing device; one end of the load end cable penetrates through the output signal detector and is connected with the terminal W, one output end of the output signal detector is connected with the signal preprocessing device, and the other output end of the output signal detector is connected with the simulation load; the output end of the signal preprocessing device is connected with the input end of the signal comprehensive processing platform, and the output end of the signal comprehensive processing platform is connected with the fault display. Design is simple, operation is convenient, and faults can be accurately judged. The device overcomes the defects that missing detection occurs during visual inspection or wrench detection and a plurality of bolts are not easy to detect, and is suitable for detecting the contact performance of the main loop of the explosion-proof electrical switch after assembly or maintenance.

Description

Technical Field

[0001] The utility model belongs to the technical field of explosion-proof electrical switches, and in particular relates to a main circuit contact performance detection system for explosion-proof electrical switches. Background Art

[0002] The vacuum contactor or vacuum circuit breaker is the main component of the explosion-proof switch. After being connected with cables, terminals, protective devices, etc., it forms the main circuit of the explosion-proof electrical switch, and the power is sent to the load through this circuit. The contact performance of the main circuit of the explosion-proof electrical switch affects the safety performance of the explosion-proof electrical switch. The main circuit contact performance inspection after the explosion-proof electrical switch is assembled or repaired is an important item of factory inspection. By checking that the bolts fastening the main electrical circuit are in a tight state, it is prevented that the temperature rise caused by poor contact will damage the equipment. At present, the main circuit contact performance test is judged by visual inspection, using tools such as wrenches to check whether the fastening bolts are tightened, or using a contact resistance meter to test the contact resistance of the main circuit. This inspection method has certain limitations for the detection of the contact performance of the main circuit of the explosion-proof electrical switch, and is inefficient. Summary of the invention

[0003] The purpose of the utility model is to eliminate the shortcomings and disadvantages of the existing contact performance test and to provide a practical, reliable, safe and easy-to-operate test system that can quickly test the contact performance of the main electrical circuit of an explosion-proof electrical switch.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: a contact performance detection system for the main circuit of an explosion-proof electrical switch, the power supply end of the explosion-proof electrical switch has three wiring terminals L1, L2, and L3, and the load end has three wiring terminals U, V, and W, characterized in that: the power supply end cable passes through the input signal detector and is connected to the terminal L1, the terminal L2 and L3 are connected by a cable, and the output end of the input signal detector is connected to the signal preprocessing device; one end of the load end cable passes through the output signal detector and is connected to the terminal W, the terminal U and V are connected by a cable, one output end of the output signal detector is connected to the signal preprocessing device, and the other output end is connected to the simulated load; the output end of the signal preprocessing device is connected to the input end of the signal comprehensive processing platform, and the output end of the signal comprehensive processing platform is connected to the fault display;

[0005] The signal preprocessing device is composed of a first filter, a first current-voltage converter, a second filter, a second current-voltage converter, a signal processor, a signal output device and an isolator: the signal processor is provided with two input terminals, which are respectively connected to the output terminal of the first current-voltage converter and the output terminal of the second current-voltage converter, the input terminal of the first current-voltage converter is connected to the output terminal of the first filter, and the input terminal of the first filter is connected to the output terminal of the input signal detector; the input terminal of the second current-voltage converter is connected to the output terminal of the second filter, and the input terminal of the second filter is connected to the output terminal of the output signal detector; the output terminal of the signal processor is connected to the input terminal of the signal output device, and the output terminal of the signal output device is connected to the input terminal of the isolator;

[0006] The signal comprehensive processing platform consists of a signal processor and a display driving unit; the output end of the isolator is connected to the input end of the signal processor, the output end of the signal processor is connected to the input end of the display driving unit, and the output end of the display driving unit is connected to the fault display.

[0007] A through hole is provided in the middle of the input signal detector and the output signal detector; the power end cable passes through the input signal detector through the through hole and is connected to the terminal L1, and one end of the load end cable passes through the output signal detector through the through hole and is connected to the terminal W.

[0008] The signal comprehensive processing platform has pre-stored standard signals inside.

[0009] The utility model has the following beneficial effects: simple design, convenient operation, and accurate fault judgment. It solves the defects of missed inspection and difficult inspection of multiple bolts during visual inspection or wrench inspection, and is suitable for testing the contact performance of the main circuit of explosion-proof electrical switches after assembly or maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the utility model;

[0011] Figure 2 This is a schematic diagram of the structure of the explosion-proof electrical switch of the utility model;

[0012] In the figure: 1-explosion-proof electrical switch, 2-signal preprocessing device, 21-first filter, 22-first current-voltage converter, 23-second filter, 24-second current-voltage converter, 25-signal processor, 26-signal output device, 27-isolator, 3-signal comprehensive processing platform, 31-signal processor, 32-display drive unit, 4-input signal detector, 5-output signal detector, 6-simulated load, 7-fault display. DETAILED DESCRIPTION

[0013] See Figure 1-2, a contact performance detection system for the main circuit of an explosion-proof electrical switch, wherein the power supply end of the explosion-proof electrical switch 1 has three wiring terminals L1, L2, and L3, and the load end has three wiring terminals U, V, and W, characterized in that: the power supply end cable passes through the input signal detector 4 and is connected to the terminal L1, the terminal L2 and L3 are connected by a cable, and the output end of the input signal detector 4 is connected to the signal preprocessing device 2; one end of the load end cable passes through the output signal detector 5 and is connected to the terminal W, the terminal U and V are connected by a cable, one output end of the output signal detector 5 is connected to the signal preprocessing device 2, and the other output end is connected to the simulated load 6; the output end of the signal preprocessing device 2 is connected to the input end of the signal comprehensive processing platform 3, and the output end of the signal comprehensive processing platform 3 is connected to the fault display 7;

[0014] The signal preprocessing device 2 is composed of a first filter 21, a first current-voltage converter 22, a second filter 23, a second current-voltage converter 24, a signal processor 25, a signal output device 26 and an isolator 27: the signal processor 25 is provided with two input terminals, which are respectively connected to the output terminal of the first current-voltage converter 22 and the output terminal of the second current-voltage converter 24, the input terminal of the first current-voltage converter 22 is connected to the output terminal of the first filter 21, and the input terminal of the first filter 21 is connected to the output terminal of the input signal detector 4; the input terminal of the second current-voltage converter 24 is connected to the output terminal of the second filter 23, and the input terminal of the second filter 23 is connected to the output terminal of the output signal detector 5; the output terminal of the signal processor 25 is connected to the input terminal of the signal output device 26, and the output terminal of the signal output device 26 is connected to the input terminal of the isolator 27;

[0015] The signal integrated processing platform 3 is composed of a signal processor 31 and a display driving unit 32; the output end of the isolator 27 is connected to the input end of the signal processor 31, the output end of the signal processor 31 is connected to the input end of the display driving unit 32, and the output end of the display driving unit 32 is connected to the fault display 7.

[0016] A through hole is provided in the middle of the input signal detector 4 and the output signal detector 5; the power end cable passes through the input signal detector 4 through the through hole and is connected to the terminal L1, and one end of the load end cable passes through the output signal detector 5 through the through hole and is connected to the terminal W.

[0017] The signal comprehensive processing platform 3 has standard signals pre-stored therein.

[0018] Detection method: Before detection, the front end of the power input terminal L1 is connected to the power end with a cable, the rear end of the power input terminal L1 is connected to the front end of the vacuum contactor or vacuum circuit breaker with a cable, the U end and the V end of the vacuum contactor or vacuum circuit breaker are connected with a cable, the power input terminal L2 and the power input terminal L3 are connected with a cable, and the W end of the vacuum contactor or vacuum circuit breaker is connected to the simulated load 6 with a cable.

[0019] During the detection, the standard power supply voltage and current are adjusted, the power supply is turned on, the explosion-proof electrical switch 1 is closed, the vacuum contactor or vacuum circuit breaker is energized, and the power flows in from the power supply introduction terminal L1 of the explosion-proof switch 1, flows into V, L2, and L3 through U, and flows out from W to the simulated load 6. At this time, the signal of the input signal detector 4 is filtered by the first filter 21 and converted by the first current-voltage converter 22, and then processed by the signal processor 25. At the same time, the signal output by the output signal detector 5 is filtered by the second filter 23 and converted by the second current-voltage converter 24, and then processed by the signal processor 25, and finally output by the signal output device 26, and enters the signal comprehensive processing platform 3 after being isolated by the isolator 27.

[0020] The processed signal is compared and judged with the standard signal, and then the signal is output to the fault display 7. When the main circuit fasteners are not tightened according to the standard, the contact resistance increases, the current is significantly higher than the normal current, and the signal passing through the input signal detector 4 and the output signal detector 5 is significantly increased. The signal passes through the signal preprocessing device 2 and the signal comprehensive processing platform 3 and is output to the fault display 7.

[0021] After the inspection is completed, turn off the power supply and remove the explosion-proof electrical switch 1 from the inspection system.

Claims

1. A system for detecting contact performance of a main circuit of an explosion-proof electrical switch, wherein the power supply end of the explosion-proof electrical switch (1) has three wiring terminals L1, L2, and L3, and the load end has three wiring terminals U, V, and W, and the system is characterized in that: The power supply end cable passes through the input signal detector (4) and is connected to the terminal L1, the terminals L2 and L3 are connected by a cable, and the output end of the input signal detector (4) is connected to the signal preprocessing device (2); one end of the load end cable passes through the output signal detector (5) and is connected to the terminal W, the terminals U and V are connected by a cable, one output end of the output signal detector (5) is connected to the signal preprocessing device (2), and the other output end is connected to the simulated load (6); the output end of the signal preprocessing device (2) is connected to the input end of the signal comprehensive processing platform (3), and the output end of the signal comprehensive processing platform (3) is connected to the fault display (7); The signal preprocessing device (2) is composed of a first filter (21), a first current-voltage converter (22), a second filter (23), a second current-voltage converter (24), a signal processor (25), a signal output device (26) and an isolator (27): the signal processor (25) is provided with two input terminals, which are respectively connected to the output terminal of the first current-voltage converter (22) and the output terminal of the second current-voltage converter (24); the input terminal of the first current-voltage converter (22) is connected to the output terminal of the first filter (21), and the input terminal of the first filter (21) is connected to the output terminal of the input signal detector (4); the input terminal of the second current-voltage converter (24) is connected to the output terminal of the second filter (23), and the input terminal of the second filter (23) is connected to the output terminal of the output signal detector (5); the output terminal of the signal processor (25) is connected to the input terminal of the signal output device (26), and the output terminal of the signal output device (26) is connected to the input terminal of the isolator (27); The signal integrated processing platform (3) is composed of a signal processor (31) and a display driving unit (32); the output end of the isolator (27) is connected to the input end of the signal processor (31), the output end of the signal processor (31) is connected to the input end of the display driving unit (32), and the output end of the display driving unit (32) is connected to the fault display (7).

2. The explosion-proof electrical switch main circuit contact performance detection system according to claim 1, characterized in that: The input signal detector (4) and the output signal detector (5) are both provided with through holes in the middle; the power supply end cable passes through the input signal detector (4) through the through hole to be connected to the terminal L1, and one end of the load end cable passes through the output signal detector (5) through the through hole to be connected to the terminal W.

3. The explosion-proof electrical switch main circuit contact performance detection system according to claim 1, characterized in that: The signal comprehensive processing platform (3) has standard signals pre-stored inside.

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