PROTECTIVE RELAY SYSTEM OF POWER SUPPLY SYSTEM AND PROTECTING METHOD OF POWER SUPPLY SYSTEM

摘要

PROBLEM TO BE SOLVED: To properly protect a power supply system with a simple configuration without requiring much cost.;SOLUTION: A protective relay system of a power supply system arranged in a power station applies a first voltage of a generator to a primary winding of a transformer, fetches a second voltage acquired by converting the first voltage from the secondary wiring of the transformer, and transmitting the fetched second voltage via a breaker. The protective relay system has a first voltage transformer for detecting the first voltage applied to the primary winding, a second voltage transformer for detecting the second voltage fetched from the secondary winding, and a protective relay device for tripping the breaker if the difference in potential between the first voltage detected in the first voltage transformer and the second voltage detected in the second voltage transformer exceeds a predetermined threshold.;COPYRIGHT: (C)2007,JPO&INPIT