Division test method and tester for multi-point grounding of common loop

A multi-point grounding and tester technology, applied in the direction of instruments, measuring electricity, measuring devices, etc., can solve the problems of burning shielding layer, inaccurate measuring devices, incorrect actions of protection devices, etc., achieve friendly and intuitive interface, simple and convenient operation , Simple and convenient operation

Inactive Publication Date: 2011-02-09
王道龙
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the on-site personnel do not have special equipment to judge, it is very difficult to find out whether multi-point grounding occurs, and the hidden danger of multi-point grounding in the secondary circuit will burn the shielding layer, cause incorrect action of the protection device and incorrect measurement device. A

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  • Division test method and tester for multi-point grounding of common loop
  • Division test method and tester for multi-point grounding of common loop

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Embodiment Construction

[0019] combine figure 1 As shown, a common circuit multi-point grounding shunt test method, which includes the following steps:

[0020] A. A branch circuit consisting of a constant-current current source 1 and an AC ammeter 2 connected in series between the measured N line 4 and the grounding points A and B;

[0021] B. Connect a clamp-on ammeter 3 to the N line 4 to be measured, and measure the current of the N line branch;

[0022] C. Turn on the constant current source 1, adjust the output current of the constant current source, and record the current I1 of the AC ammeter and the current I2 of the clamp ammeter;

[0023] D. Compare the magnitude of the current I1 of the AC ammeter and the current I2 of the clamp ammeter. If the current I2 of the clamp ammeter < the current I1 of the AC ammeter, it means that there are multi-point grounding and bypass current I3, then it can be determined that the N line has two or more points Point grounding phenomenon; if clamp-type amm...

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Abstract

The invention discloses a test method and tester for multi-point grounding of a common loop. The invention has the following beneficial effects: connecting a constant-current source and an alternating current ammeter in parallel between an N wire to be tested and a ground point and using a clip-on ammeter to measure the branch current of the N wire to be tested and the ground point to change the current value of the constant-current source and comparing the current of the alternating current ammeter I1 with the current of the clip-on ammeter I2 to judge whether the N wire to be tested undergoes multi-point grounding. The method and the tester can directly detect whether the common loop undergoes multi-point grounding without exiting from the original ground point, and are simple and convenient to operate and friendly and intuitive in interface. The method and the tester can be widely applied to power field operation and detection.

Description

technical field [0001] The invention relates to a test method for multi-point grounding of a common circuit. The invention also relates to a public circuit multi-point grounding tester. Background technique [0002] At present, the conventional method to check the multi-point grounding of the PT secondary circuit is through the PT secondary voltage drop test and the N line zero-sequence current measurement. Since the on-site personnel do not have special equipment to judge, it is very difficult to find whether multi-point grounding occurs or not, and the hidden danger of multi-point grounding of the secondary circuit will burn the shielding layer, cause the incorrect action of the protection device and the inaccuracy of the metering device. Accurate, even causing a huge risk of large-scale power outages. In the actual power grid operation, accidents caused by multi-point grounding of the secondary circuit occur frequently. Therefore, the field workers urgently need a device...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R31/02G01R15/14
Inventor 王道龙谢春扬王伟
Owner 王道龙
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