Journal of Shandong University(Engineering Science) ›› 2021, Vol. 51 ›› Issue (1): 76-86.doi: 10.6040/j.issn.1672-3961.0.2020.416

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Earth fault protection method based on frequency band power factor

LIU Yuanlong1,2,LIU Weisheng2,WANG Pengwei3*,WU Bin4,ZHANG Hengxu1,XU Bingyin3   

  1. 1. School of Electrical Engineering, Shandong University, Jinan 250100, Shandong, China;
    2. State Grid Shandong Electric Power Company, Jinan 250061, Shandong, China;
    3. College of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, Shandong, China;
    4. Tai'an Power Supply Company, State Grid Shandong Electric Power Company, Taian 271000, Shandong, China
  • Online:2021-02-20 Published:2021-03-01

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Abstract: This paper proposed a method to calculate an active power coefficient of the zero-sequence signal in the frequency band below 80 Hz. The coefficient was defined the ratio of active to apparent power within a fixed time window. This method identified the fault direction through the polarity and absoluted value of the coefficient. Digital simulation and actual fault recordings data had verified the feasibility of the proposed method, which could trip reliably for high impedance faults, and avoid the current transformer error.

Key words: low current earth fault, active power coefficient, frequency band, intermittent fault, zero-sequence current transformer

CLC Number: 

  • TM771
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