DEVICE FOR DETECTING OPEN PHASE OF CONNECTION LINE OF STANDBY TRANSFORMER IN NUCLEAR POWER PLANT BY USING ROGOWSKI COIL

摘要

Disclosed is a device for detecting an open phase of a connection line of a standby transformer in a nuclear power plant by using a Rogowski coil. The open phase detection device, according to the present invention, comprises: a Rogowski coil provided to a neutral line of a Y connection at the primary side of the standby transformer used in a nuclear power plant; an open phase detection unit for determining the generation of an open phase at the primary side and generating a warning signal if a current induced in the Rogowski coil is maintained at a value higher than a preset reference value for a time longer than a preset reference time in a state where a circuit breaker at the secondary side of the standby transformer is open; and a main control unit for displaying the warning to an administrator according to the warning signal provided by the open phase detection part.