Identification Method for Intermittent Arc Grounding Faults in Substation Protective Relays
Traditional intermittent arc grounding fault identification methods mainly utilize electrical quantities for analy-sis,which are easily affected by interference signals such as system operation status and load changes,leading to low ac-curacy in fault identification.To solve the above problems,it is necessary to first analyze the characteristics of grounding faults,extract transient quantities of intermittent arc grounding fault signals based on fault characteristics,locate the arc grounding fault section through transient quantities containing arc grounding information,determine the fault location,and then judge the grounding fault according to transient energy changes,achieving fault identification of intermittent arc grounding.The experimental results show that compared with wavelet transform and Fourier transform methods,the i-dentification method for intermittent arc grounding faults in substation protective relays studied in this work can accurately identify the location and duration of faults with higher recognition accuracy,and is hence of high applicative value.
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