ANALYSIS ON NEUTRAL GROUNDING OF DISTRIBUTION SYSTEM

In distribution systems the following grounding ways, i.e., non grounding, arc suppression coil grounding and resistance grounding, are often applied. Because each grounding way has its own features, therefore, it is necessary to carry out technical economical comparison before selection for the particular case. For low voltage transmission lines consisting of overhead lines and cables it is still disputed to select whether arc suppression grounding or resistance grounding. According to the concrete case of 10kV feeders in the two substations at new district of Suzhou and based on the analyses on power supply reliability, switching surge overvoltage, interference to telecommunication lines, protective relaying and personal safety, the selection is that to adopt resistance grounding for 10kV system of the two substation is suitable.