Restudy of Fault Current Distribution Ratio with Grounding Type of Normal Joint Box in Underground Transmission Systems

지중송전계통에서 보통접속함의 접지방식에 따른 고장전류분류율 재검토

Receltly, Underground transmission system is getting increased. Therefore the design of grounding system becomes very important to discharge overcurrent of lightning and fault through earth and reduce sheath induced voltage and sheath circulation current. This paper describes fault current distribution ratio for grounding line with grounding types of normal joint box and sheath grounding resistor at line-to-ground fault of cable.