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During the loop closing operation, excessive loop current may occur because of the amplitude and phase difference of the busbar voltage on both sides of the loop point, causing overcurrent protection or quick-break protection maloperation. This paper takes the loop closing operation of 10 kV hybrid grounding model of arc suppression coil and low resistance in Hangzhou as an example, use ATP-EMTP software to build the simulation model. The factors affecting the size of the loop current are tested, and the specific conditions for the loop closing operation are determined. The conclusions have great significances for promoting the automatic loop closing operation of 10kV distribution network. The conclusions have great significances for promoting the automatic loop closing operation of 10kV hybrid grounding distribution network.

Research on loop closing operation of hybrid grounding system based on distribution automation