Application of Neutral Point Earthed Method in Medium Voltage Power Grid

The neutral point earthed method of power system is not only a technical issue ,but also an economic issue. The paper compares ZhongHua Power Supply Company of HongKong with Yancheng Power Supply Company of JiangSu, the two representative power supply companies that adopt the different neutral point earthed methods, in the way of issue character, research aim, developing history, internal overvoltage, cable network, operation speciality and economic benefit to analyse and demonstrate. Trying to find out the best project to accord with the fact of power system.