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An open phase condition (OPC) is defined where power in one (or two) of the three phases of an off-site power source feed is lost for a long duration. Currently, OPC on nuclear power system has been reported from various countries of the world, however, the design vulnerability on power system that the existing protection relay in the power plant cannot detect the fault has been come to the front. Therefore, it is necessary to analyze the design vulnerability of power system for OPC in Korean nuclear power plants having similar power system structure with overseas power plants. In this paper, the occurrence of OPC in a power plant that supplies power to the on-site through SUT among domestic standard nuclear power plants is simulated by ETAP and analyzed the detectability of OPC event by current protection relay. The results of this study can be used as technical background data to improve the protection system of power plants and establish related regulations.

Simulation and detectability analysis of power system open phase condition in Korea’s standard nuclear power plant