Research and development of high-precision distribution network single-phase ground fault detection and location system
Liu Hongwen1, Guo Hui2, Wang Ke1, Xu Yu2, Yu Qinxue2
1. Electric Power Research Institute of Yunnan Power Grid Co., Ltd, Kunming 650217; 2. Department of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049
Abstract：In order to solve the difficulties in location of small current grounding faults in distribution network, a new single-phase ground fault detection and location system for distribution network lines is designed and developed. The principle of fault detection and location of the system is to obtain the zero-mode voltage through the Karenbuaer phase-mode transformation and use the zero-mode voltage to judge whether the fault has occurred, and use the B-type traveling wave method to measure the fault. The system first uses the capacitor divider to extract the fault transient voltage signal. After simple analysis and processing of the data by the DSP, the fault information is summarized into the upper computer through the IoT communication module, and the upper computer analyzes and compares the data uploaded by each detecting device. The fault line selection is realized, and the nanosecond timing module is used to synchronously time the system, which can improve the measurement accuracy of the line wave arrival time of the line monitoring device to the nanosecond level, thereby improving the accuracy of the traveling wave distance measurement.
刘红文, 郭辉, 王科, 徐雨, 于钦学. 高精度配网单相接地故障检测与定位系统研发[J]. 电气技术, 2020, 21(1): 60-66.
Liu Hongwen, Guo Hui, Wang Ke, Xu Yu, Yu Qinxue. Research and development of high-precision distribution network single-phase ground fault detection and location system. Electrical Engineering, 2020, 21(1): 60-66.
2020, Vol. 21 
