| The difference among three neutral grounding modes is discussed and the merits and demerits of these modes are compared. The capacitance current in 10kV side of Dongjiao substation of Huaian city is calculated and compared with the actual circumstance. Simulated calculation is performed to analyze the regular over-voltage in distribution network,. At the same time, the limit of over-voltage in different neutral grounding modes has been taken into account.The paper also compared three neutral grounding modes from the stability of electricity power supply, electric facilities, the level of insulation, the disturbance of communication, the protection system and the safety of operator. According to the actual circumstance of Dongjiao substation, the selection of grounding modes is via Peterson coil which mainly consists of an auto-tuned Peterson coil. The capability and out-of-resonance of Peterson coil are calculated.
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