Operating Characteristic of a User Defined Distance Relay Model in PSS/E during Voltage Instability

전압 불안정시 PSS/E 사용자 정의모델로 구현된 거리계전기 응동 특성

This paper presented a method to develop a relay model by the user-written model function of PSS/E. As for the voltage instability, although generator current limiters, transformer's tap-changers and dynamic loads have been considered as the dominant components, the protection system is also very important because it may influence the system's dynamic behaviour. Hence a distance relay model implemented with the suggested method was added, and then the operating characteristics of the distance relay under the voltage instability condition were investigated.