As one of the most common internal overvoltages in small current grounding system,arc grounding overvoltage poses a great threat to the safe and stable operation of power system,and the generation of arc overvoltage is often accompanied by intermittency.The analysis of transient characteristics and influencing factors of intermittent arc overvoltage can provide a necessary reference for preventing and controlling this phenomenon.For this reason,several different influencing factors are considered,including arc reignition time,arc duration,arc extinction time and arc resistance.By building a simulation platform for ungrounded neutral system,the transient characteristics of intermittent arc grounding overvoltage are analyzed,and the effects of various influencing factors are compared.The results show that the intermittent grounding in ungrounded neural system can produce obvious overvoltage,and the magnitude of overvoltage is mainly affected by the reignition time and arc resistance,while the arc duration and arc extinction time have little influence on the magnitude of overvoltage.
small current grounding systemarc overvoltageintermittencyinfluencing factors
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