The analysis of specific grounding fault and Petersen on ARC grounding out arc

10KV–35KV Medium Voltage Distribution Network neutral point grounding modes choice is a systems engineering. When ARC grounding fault happens, neutral through Petersen coil can carry out effective blow has always been a focus. By arc grounding in the neutral through Petersen coil process, Results are as long as proper control of relative roughness. Neutral through Arc - suppression coil grounding ways to better control of ARC grounding fault without affecting the reliability of power supply. Study on small current earth fault line selection and field failure data of monitoring and control system of records. Analysis of intermittent arc grounding and unbalanced current grounding and development of grounding and the cause of formation of ring earth fault and fault phenomenon and zero - sequence voltage and current situation. Description of single - phase to ground fault in small current grounding system is a complex one, development and the process of change. Only attaches importance to this process is enough to improve the reliability and accuracy of line selection.