Abstract
After a large number of distributed electricity energy has been accessed to network, the system structure and operating characteristics of the distribution network will be greatly changed. The multigrounding of the micro-grid system was discussed from the provisions of the relevant electrical standards and the view of practical point. It is clear that PE wire is the repeated grounding instead of N repeated grounding in the TN system of micro-grid, and multigrounding problems that should be attention were described in TN-S and TT systems of micro-grid.
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