High resistance single-phase grounding line selection in resonant grounding systemsbased on correlation detection
DOI：10.19783/j.cnki.pspc.220005
Key Words:distribution networks  resonant grounding systems  single phase grounding (SPG)  single phase grounding line selection  correlation detection  cross correlation function
Author NameAffiliation
LIU Jian 1. State Grid Shaanxi Electric Power Research Institute, Xi'an 710100, China
2. School of Automation, Xi'an University of Technology, Xi'an 710048, China
3. Hebei Xuhui Electric Co., Ltd., Shijiazhuang 050035, China 
CHEN Xizi 1. State Grid Shaanxi Electric Power Research Institute, Xi'an 710100, China
2. School of Automation, Xi'an University of Technology, Xi'an 710048, China
3. Hebei Xuhui Electric Co., Ltd., Shijiazhuang 050035, China 
ZHANG Zhihua 1. State Grid Shaanxi Electric Power Research Institute, Xi'an 710100, China
2. School of Automation, Xi'an University of Technology, Xi'an 710048, China
3. Hebei Xuhui Electric Co., Ltd., Shijiazhuang 050035, China 
LI Ruigui 1. State Grid Shaanxi Electric Power Research Institute, Xi'an 710100, China
2. School of Automation, Xi'an University of Technology, Xi'an 710048, China
3. Hebei Xuhui Electric Co., Ltd., Shijiazhuang 050035, China 
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Abstract:To improve the level of limitation of high resistance single-phase grounding line selection in resonant grounding systems, a single-phase grounding line selection approach based on correlation detection is proposed. The compensation current of an arc suppression coil is modulated with a low-frequency square wave. The signal characteristics of fault and healthy lines after modulation are analyzed. The zero-sequence current of each line divided by the amplitude of zero sequence voltage enveloping is used for demodulation and correlation detection. A single-phase grounding line selection criterion based on a cross-correlation function is constructed and the influence of the selection of low-frequency modulated square wave frequency on line selection effect is analyzed and discussed. Simulation and experiments are carried out, the results of which show that it can accurately select the single-phase grounding line with a large high grounding resistance. This work is supported by the National Natural Science Foundation of China (No. U1766208).
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