Present State and Development Prospect on the Protective Relaying Under High Resistance Earth Faults in Transmission Systems

송전계통 고저항 지락사고 보호기술 현황 및 개발전망

This paper describes the present state and development prospect on the protective relaying under high resistance earth faults in transmission systems. Especially it is difficult to detect the fault accompanied with high resistance contary to low resistance. In the complicated power system if the detection is failed, power failure will be occured in large area. New technology with respect to such a problem must be developed. This paper introduces research and development trend in home and abroad.