A Study on the Operational Characteristic of Distance Relay According to Power System Condition

계통조건에 의한 거리계전기의 응동특성에 관한 연구

This paper presents the reach accuracy of a distance relay for protection of transmission line according to power system conditions. The apparent impedance of distance relay is considerably affected by source impedance, load current, power factor, fault point and resistance etc. For protective coordination on the variables power system parameters, trip characteristics of distance relay at sending and receiving terminal are discussed.