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Faulty Feeder Detection Under High Impedance Faults Based on Harmonics of Calculated Fault Currents in Resonant Grounding Network
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DOI：10.1109/TPWRD.2025.3647127.png)
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Abstract
En 中文
The identification of faulty feeders under high impedance faults (HIF) presents significant challenges due to weak fault currents and the difficulty in capturing transient components. Instead of relying on transient features, this paper proposes a faulty-feeder detection method for HIFs based on the harmonic characteristics of the calculated fault currents, and it is effective throughout the HIFs duration, which are immune from the fault triggering time. Firstly, the fault characteristics under HIFs are analyzed considering the nonlinear arcs, revealing that harmonic currents predominantly presented in the faulty feeder can be utilized for identification. Secondly, the fault currents at the fault points are calculated by subtracting the capacitive currents from the faulty-feeder zero-sequence currents (ZSC), significantly enhancing the nonlinear features in the ZSCs, whereas the calculated currents for healthy feeders essentially remain as capacitive currents with few arc-related distortions. A two-step fundamental component shift method is then developed to extract harmonic currents from these calculated fault currents. Thirdly, the energy proportion and kurtosis value are applied to describe the fault features of the extracted harmonics. Finally, a comprehensive detection scheme integrating harmonic energy and kurtosis criterion is proposed. Various test verifications demonstrate the feasibility and reliability of the proposed method.
Keywords:
Harmonic analysis
Feature extraction
Fault diagnosis
Fault currents
Distortion
Transient analysis
Capacitance
Impedance
Kurtosis
Distortion measurement
Capacitive currents
harmonic currents
high impedance faults
faulty-feeder detection
fault triggering time
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