The present invention relates to a protection relay device for protection of a power system to which FACTS is applied and a power system protection method using the same. In more detail, in consideration of the operation of the FACTS (Flexible AC Transmission System) put into the real system, a protection relay device for the protection of the power system to which FACTS is applied, which can effectively protect the power system in the event of a failure, and the power system using the same It's about protection. The present invention provides a protection relay device for protection of a power system to which a Flexible AC Transmission System (FACTS) is applied, wherein the current value and voltage value of the power system and the operation mode information of the FACTS are received when a failure of the power system occurs. data input unit; a failure point determination unit for determining a failure point of the power system using the current and voltage values and the operation mode information; and a control signal generator for generating a control signal for the operation of the circuit breaker applied to the power system according to the determined failure point and transmitting the generated control signal to the circuit breaker. According to the present invention, the power system protection can be performed by reflecting the change of the power system according to the operation mode of the FACTS in real time, thereby increasing the reliability of the power system protection.
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