PROTECTIVE RELAY SYSTEM FOR SUBSTATION PROTECTION

摘要

Disclosed is a protective relay system for protecting a transformation facility. The protective relay system of the present invention comprises: a power conversion device which receives power from grid power or a power supply unit and converts the power to output the power to a load device; a first blocking unit which blocks a distribution line of an input terminal of the power conversion device; a second blocking unit which blocks a distribution line of an output terminal of the power conversion device; and a protection relay device which measures each of the amount of power of the input terminal and the amount of power of the output terminal of the power conversion device, detects an abnormal state and a fault by using a measurement result, and controls blocking of the distribution lines of the first and second blocking units. The present invention detects the amount of power inputted and outputted to a transformation facility, which is a subject to be protected, such as a power conversion device, an inverter, a power storage device, and the like, simultaneously in real time. When a dangerous state is detected, the input or output of the transformation facility is blocked in advance. Thus, it is possible to prevent accidents or malfunction of transformation facilities.