Fault line selection method in resonant earthed system based on transient signal correlation analysis under high and low frequencies

被引：0
|
作者：
Tang T. [1 ]
Huang C. [1 ]
Jiang Y. [1 ]
Luo X. [1 ]
Xie X. [1 ]
Liu P. [1 ]
机构：
[1] College of Electrical and Information Engineering, Hunan University, Changsha
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2016年 / 40卷 / 16期
关键词：
Correlation analysis; Distribution network; Fault line selection; Resonant earthed system; Single-phase grounding; Zero sequence current;
D O I：
10.7500/AEPS20151125013
中图分类号：
学科分类号：
摘要：
In order to overcome the inaccurate selection of faulty line of single-phase grounding fault when the phase voltage passes zero in resonant earthed system, a method of correlation analysis is proposed based on zero sequence current of lines and zero sequence voltage of bus both in high and low frequency bands. After the single-phase ground fault appeared in the system, the impedance of the sound line shows capacitance characteristics in the high frequency and the low frequency band. With respect to the impedance of the faulty line, it shows capacitance characteristics in the high frequency band and inductance characteristics in the low frequency band. So, the correlation coefficient of the zero sequence current of the sound lines and the derivative of the bus zero sequence voltage are equal both in the high and the low frequency band, and the difference is zero. Because of the existence of decaying DC component in the faulty line, the correlation coefficient of the zero sequence current of the faulty line and the derivative of the bus zero sequence voltage is very small in the low frequency band, while the correlation coefficient in the high frequency band is large as is the difference. So, the fault line selection criterion can be formed by the characteristics. The method has clear physical meaning, the sensitivity of fault line selection can be improved near the zero-crossing point of the phase voltage, and the fault line selection in other fault conditions also can be achieved accurately. A large number of simulation results show the feasibility of the method. © 2016 Automation of Electric Power Systems Press.
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页码：105 / 111
页数：6
相关论文
共 16 条
  • [1] Shu H., Gao L., Duan R., Et al., A novel Hough transform approach of fault line selection in distribution networks using total zero-sequence current, Automation of Electric Power Systems, 37, 9, pp. 110-116, (2013)
  • [2] Wang Q., Fu Z., An adaptive method for single-phase-to-ground fault line selection based on energy entropy measure, Automation of Electric Power Systems, 36, 5, pp. 17-20, (2012)
  • [3] Xue Y., Guo L., Zhang L., Et al., Selection problems of neutral grounding mode in active distribution networks, Automation of Electric Power Systems, 39, 13, pp. 129-136, (2015)
  • [4] Zeng X., Yin X., Zhang Z., Et al., Study on feeders grounding fault protection based on zero sequence admittance, Proceedings of the CSEE, 21, 4, pp. 5-10, (2001)
  • [5] Zhang W., Zhang B., Hu H., Et al., Application of wavelet packet analysis in phase-to-ground fault detection of distribution networks, Automation of Electric Power Systems, 33, 23, pp. 60-64, (2009)
  • [6] Zhang Y., Chen C., Zhao J., Et al., A new method of locating fault line under single phase to ground fault in distribution network, Power System Technology, 26, 10, pp. 21-24, (2002)
  • [7] Bi J., Dong X., Zhou S., Et al., Fault line selection based on two-phase current travelling wave, Automation of Electric Power Systems, 29, 3, pp. 17-20, (2005)
  • [8] Xue Y., Xu B., Feng Z., Et al., The principle of directional earth fault protection using zero sequence transients non-solid earthed network, Proceedings of the CSEE, 23, 7, pp. 51-56, (2003)
  • [9] Shu H., Xu L., Peng S., Et al., Correlation analysis for faulty feeder detection in resonant earthed system, Electric Power Automation Equipment, 28, 9, pp. 27-32, (2008)
  • [10] Liu Y., Wang J., Ma J., Et al., Comprehensive fault line selection method for resonant grounded system combining wavelet packet transform with fifth harmonic method, High Voltage Engineering, 41, 5, pp. 1519-1525, (2015)
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