Abstract

The High Impedance Fault (HIF) is abnormal event occurred in distribution system feeder whenever the cable downed on the tree, sod, towers and any objects have high impedance which produced little current passes through the cable. So; the protective devices cannot identifying this lightly current because it allocated only for detecting high faulty current (low impedance fault). This situation caused dangerously cases to the human and environment like shocking and firing. The Capacitor Bank (CB) and Nonlinear Load (NL) have waveform nearby to HIF waveform. So; this study proposed technique has ability to recognize between the HIF, CB, NL and other normal working have same waveform. The MATLAB/Simulink is used to simulate distribution feeder associated with HIF model, CB, NL and Linear Load (LL).The signals extracted by simulation decomposed by Wavelet Transform (WT) in order to extract the HIF signals and other feeder incidents. Power Spectrum (PS) technique has been used to identify HIF and differentiate it from any usual cases on feeder.

Keywords:

Distribution system, HIF, MATLAB/Simulink, PS, WT,

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Competing interests

The authors have no competing interests.

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