Measuring Method of Capacitance to Ground in Resonant Grounding System Based on Transient Information after Arc Extinguishing
Xue Yongduan1, Li Guang1, Xu Bingyin2
1. College of New Energy China University of Petroleum (East China) Qingdao 266580 China; 2. College of Electronics and Electrical Engineering Shandong University of Technology Zibo 255000 China
Abstract Accurate measurement of capacitance to ground of the system involves a series of problems such as capacity allocation of arc suppression coil, compensation adjustment, control of residual current at fault point, etc. By using the equivalent circuit of single-phase grounding fault in resonant grounding system, the electrical characteristics of the fault point after arc extinguishing are analyzed. It is found that the transient process after arc extinguishing is the underdamped series resonance process between the inductance of arc suppression coil and the capacitance to ground. The system detuning degree can be calculated by the parameters of resonance frequency and damping factor. Then the capacitance or capacitance current of the system can be calculated according to compensation inductance, which includes zero-sequence inductance of arc suppression coil and grounding transformer. The error of this method is related to the error of resonance frequency, damping factor and compensation inductance. But it mainly depends on the error of compensation inductance. The validity and accuracy of the method are verified by simulation and field data. As a passive measurement method, this method needs no special equipment or adjustment of the operation status of existing equipment, it has high security and provides a new idea for capacitive current measurement of resonant grounding system.
Xue Yongduan,Li Guang,Xu Bingyin. Measuring Method of Capacitance to Ground in Resonant Grounding System Based on Transient Information after Arc Extinguishing[J]. Transactions of China Electrotechnical Society, 2020, 35(7): 1521-1528.
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2020, Vol. 35 
