Analysis on effect of neutral grounding via high-resistance to arc grounding overvoltage

摘要

This paper analyzes and compares the advantages and shortcomings of every kind of method on neutral grounding, presents the view of neutrla grounding via high-resistance in 3.3kV power supply. Considering the specialties that line-to-ground capacitance is very small at coalface electric network, the value of neutral grounding resistor may be increased properly, and gives out the formula on selecting value of resistor in details. Experimental results that are gotten in modeling 3.3kV electric network in lab are given out also.