High impedance ground fault detection based on time-frequency characteristics and SVM
Zhang Junqi1, Yang Fan2, Guo Moufa1
1. College of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350116; 2. State Grid Nanping Electric Power Supply Company, Nanping, Fujian 353000;
Abstract：When the high impedance ground fault (HIF) occurs, the grounding resistance of the fault point is high, and it is often accompanied by arc extinction and restriking. The fault current is very small and strongly random. Detection of HIF is generally difficult by the conventional over-current protection devices, because they cannot draw enough current to operate the devices. In this paper, a new HIF detection method that uses LCD band-pass filter and support vector machine (SVM) is presented. Using this method, HIF can be discriminated from transients such as capacitor switching, load switching, inrush current. LCD band-pass filter is used for obtaining the time-frequency matrices of current waveforms of the bus line. The feature vectors are the standard deviation of each frequency band, and SVM is used for classification.
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2018, Vol. 19 
