배전 계통의 최적 적응형 과전류 계전기 보호협조 방안

The Protection coordination of overcurrent relay in power system plays an important role to protect and operate the system under different fault condition in a distribution system. This paper proposes a protection coordination of overcurrent relay (OCR) when a fault occur in a power system, how the primary and secondary protection relays coordinate with each other to keep the system secure.