The Research and Application Based on Removable High-Precision DC Weak Current Sensor

Author:

Wang Peng1,Wang Song Nan2,Chen Ji Xin3,Ren Ming Xin3,Huang Hai Bo3,Yang Chun3,Qu Lin Kui,Shi Chun Xiang3,Zhou Fang3

Affiliation:

1. Northeast Dianli University

2. Zhuhai Power Supply Company

3. TieLing Power Supply Company

Abstract

sensor used in DC ground fault detection system according to measurement method can be divided into low frequency AC signal detecting and DC signal detecting of leakage current . It greatly affect the accuracy of the earth fault signal because of the existence of capacitance in the detecting of low frequency AC signal and it doesnt have online measurement DC current sensor in the market when we want to measure load leakage current. Caliper DC ammeter cant meet the requirements in DC system ground fault diction in terms of resolution, accuracy, range, on-line installation and on-line measurement.

Publisher

Trans Tech Publications, Ltd.

Subject

General Engineering

Reference7 articles.

1. Zhang Ciheng. Problem existing on DC System grounding fault monitoring device[J], Electric Power, 1996, 27(7): 64-66(in Chinese).

2. Wang Ruixiang, Liu Feng, Xiong Xiaofu, et al. On-line insulation monitoring of substation DC power supply[J], Electric Power Automation Equipment, 2009(12): 65-67(in Chinese).

3. Wang peng, Li Huashun, Wang Ning, Qu Linkui, Yu yin. Study on Tracking Derivative based method for DC System Grounding Fault Detection [J], International Symposium on System Engineering and Computer Simulation(SECS-2013).

4. Fei Wanmin, Zhang Yanli, Wu Zhaolin. New measuring principle of DC system grounding resistance value in electric power system [J], Automation of Electric Power systems, 2001, 25(6): 54-56(in Chinese).

5. Li Donghui, Shi Lintong. An overall scheme to detect grounding fault in DC system of power plants and substations[J], Power System Technology, 2005, 29(1): 56-59(in Chinese).

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