Evaluation of Distance Relay Operation Characteristic with the Reduction Devices Installed in Underground Power Cable Systems

시스순환전류 저감장치 설치시 거리계전기 응동 특성 평가

This paper analyses the operation characteristic of distance relay when the single line to ground occurs in underground power cable systems that reduction device of sheath circulating current is installed. To apply that reduction device to actual system, the change of line impedance calculated at relay point is also analysed by the connection type of SVLs and fault location, fault inception angle with the installation of reduction device of reactor or not.