Journal of Shandong University(Engineering Science) ›› 2020, Vol. 50 ›› Issue (5): 99-106.doi: 10.6040/j.issn.1672-3961.0.2020.024

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Faulty phase and line selection method based on the feature extraction of the phase current in the selected frequency band

ZHANG Hejun1, WANG Peng2, XU Kai3, SHI Fang3   

  1. 1. State Grid Corporation of China, Beijing 100031, China;
    2. State Grid Henan Power Electric Power Research Institute, Zhengzhou 450052, Henan, China;
    3. School of Electrical Engineering, Shandong University, Jinan 250061, Shandong, China
  • Published:2020-10-19

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Abstract: In order to improve the accuracy of the faulty phase and faulty line selection, a method of faulty phase selection and faulty line selection is proposed based on the wavelet analysis of the three phase transient current signal. The fault phase was identified by the difference of transient current correlation between faulty phase and healthy phase. Then the transient current of each line was decomposed and reconstructed by wavelet packet, the reconstruction coefficient ratio is calculated for each line based on the transient current energy in the selected frequency band, and the ratio difference was used to identify the faulty line. A 10 kV distribution network consisting of overhead-cable hybrid line was built in PSCAD software, several simulation cases were used to verify the correctness of the proposed scheme considering different neutral grounded mode and fault resistance.

Key words: fault line selection, three-phase transient current, wavelet packet decomposition, single phase to ground fault, selected frequency band

CLC Number: 

  • TM72
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[2] ZHANG Feng1, LIANG Jun1, GAO Hong-mei2, PAN Meng3. Adaptive fault line selection method based on  a multi-scale frequency signal in non-solid earthed network [J]. JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE), 2012, 42(2): 118-123.
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