Adaptive undervoltage protection scheme for safety bus in nuclear power plants

다국어 초록 (Multilingual Abstract)

In the event of a short-circuit accident on a 4.16 kV non-safety bus, the voltage is temporarily lowered asbackflow occurs on the safety bus. In such cases, the undervoltage relay of the safety bus shall not pick upthe undervoltage so as not to interfere with the operation of the safety motors. The aim of this study is todevelop an adaptive undervoltage protection scheme for the 4.16 kV safety bus considering the faults onthe 13.8 kV and 4.16 kV non-safety buses connected to secondary windings of the three windingtransformers, UAT and SAT. The result of this study will be the adaptive undervoltage protection schemefor the safety bus of nuclear power plants satisfying functional requirements of the safety related medium voltage motors. The adaptive undervoltage protection scheme can be implemented into an integrated digital protective relay to make user friendly and reliable protection scheme.

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