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

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...

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. Accurate, and even cause a huge risk of large-scale blackout accidents. In the actual power grid operation, accidents caused by multi-point grounding of the secondary circuit occur from time to time. Therefore, the on-site staff urgently needs a device that can easily detect the multi-point grounding of the secondary circuit.

Images