Portable multipoint grounding detector

Abstract

The invention discloses a portable multipoint grounding detector used for detecting that whether multipoint grounding exists in a mutual inductor common loop or not. The portable multipoint grounding detector comprises a constant flow source used for outputting current to the neutral conductor of the mutual inductor common loop, a current transducer used for detecting the grounding current of the common grounding point of the mutual inductor common loop and outputting a grounding current value, a voltage transducer used for detecting the voltage to ground of the common grounding point of the mutual inductor common loop and outputting a voltage to ground value, a keyboard used for receiving a setting parameter set by a user and a CPU used for receiving the grounding current value, the voltage to ground value and the setting parameter. According to the invention, whether the multipoint grounding exists in the mutual inductor common loop or not can be detected rapidly and conveniently, and when detection is conducted, both time and labor are saved, and the effect is relatively good.

Description

technical field [0001] The present application relates to the field of electric power technology, and more specifically, relates to a portable multi-point grounding detector. Background technique [0002] According to the provisions of the "Safety Regulations on Electric Work Sites" and the reliability requirements of relay protection and automatic devices, the common circuit of transformers must have only one reliable grounding point. In general, there are many devices connected to the common circuit of transformers in substations, and it is easy to cause multi-point grounding in the public circuit of transformers due to human factors or aging lines, which will lead to abnormal protection actions, and in severe cases, large-scale power outages will occur. [0003] At present, electric power maintenance personnel mainly check the multi-point grounding of the common circuit of the transformer by measuring the zero-sequence current of the neutral line or the secondary voltage ...

AI Technical Summary

Problems solved by technology

In general, there are many devices connected to the common circuit of transformers in substations, and it is easy to cause multi-point grounding in the common circuit of transformers due to human reasons or aging lines, which will lead to abnormal protection actions, and in severe cases, large-scale power outages will occur.

[0003] At present, electric power maintenance personnel mainly check the multi-point grounding of the common circuit of the transformer by measuring the zero-sequence current of the neutral line or the secondary voltage drop of the transformer. There is no special detection equipment, and the detection is time-consuming and laborious, and the effect is relatively poor.

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