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During the development of the high-voltage power grid, the emergence of electromagnetic loop in the network is inevitable. To ensure the normal operation of the grid, it needs to deal with the problems brought by electromagnetic loop with scientific methods. In this paper, the impacts of the electromagnetic loop have been discussed from several aspects such as heat stability, transient stability, short-circuit current levels, reactive power and voltage control; an open-loop principle of UHV three-level electromagnetic loop were put forward and its correctness has been proved by the simulation results of the actual grid. The study can provide some suggestions for the new emerging electromagnetic loop problems in the future period of rapid UHV development.

The Operation Characteristics and open-loop method of 1000/500/220kV Three-level Electromagnetic Loop Network