基于串级法的电气回路接地故障监测方法研究  

Research on ground fault monitoring method of electrical circuit based on cascade method

作　　者：赵文祎 耿军伟[1,3] 王伟勇 陈波[1,5] 严晗 ZHAO Wenyi;GENG Junwei;WANG Weiyong;CHEN Bo;YAN Han(State Grid Beijing Electric Power Corporation Economic and Technical Research Institute,Beijing 100000,China;University of Southampton,Southampton SO171BJ,United Kingdom;China Three Gorges University,Yichang 443002,China;Hohai University,Nanjing 210098,China;Shandong University,Jinan 250100,China;Tsinghua University,Beijing 100091,China)

机构地区：[1]国网北京市电力公司经济技术研究院,北京100000 [2]英国南安普顿大学,南安普顿SO171BJ [3]三峡大学,湖北宜昌443002 [4]河海大学,江苏南京210098 [5]山东大学,山东济南250100 [6]清华大学,北京100091

出　　处：《电子设计工程》2023年第3期114-117,122,共5页Electronic Design Engineering

摘　　要：使用注入低频交流信号、漏电流监测的故障监测方法缺少对电容的监测,使电压波形与实际波形变化幅度不一致,导致故障监测精准度较低。基于此,提出了基于串级法的电气回路接地故障监测方法研究。根据串级法监测电路接地故障监测原理,设计接地电阻串级监测的示意图,对直流系统正、负极对地绝缘电阻进行监测。判定接地支路,计算电流,确定正弦输入信号。使用二维滤波算法缩小误差,依据接地电阻判定接地支路故障情况,实现对地电容的监测。由实验结果可知,该方法电压变化趋势为0 V-300 V-0 V,与实际电压仿真波形一致,监测结果精准。The fault monitoring method of injecting low-frequency AC signal and leakage current monitoring lacks capacitance monitoring,which makes the variation amplitude of voltage waveform inconsistent with the actual waveform,resulting in low fault monitoring accuracy. Therefore,the research on electrical circuit grounding fault monitoring method based on cascade method is proposed. According to the grounding fault monitoring principle of series monitoring circuit,the schematic diagram of cascade monitoring of grounding resistance is designed to monitor the positive and negative insulation resistance to ground of DC system. Determine the grounding branch,calculate the current and determine the sinusoidal input signal. The two-dimensional filtering algorithm is used to reduce the error,determine the fault of the grounding branch according to the grounding resistance,and realize the monitoring of the grounding capacitance. The experimental results show that the voltage variation trend of this method is0 V-300 V-0 V,which is consistent with the actual voltage simulation waveform and has accurate monitoring results.

关 键 词：串级法 电气回路 接地故障 监测 跟踪监测 

分 类 号：TN713[电子电信—电路与系统]