Analysis of Effect on the Transient State According to Common Grounding between Underground Transmission Systems and Distribution Systems

지중송전 및 배전계통의 공통접지에 따른 과도상태 영향 분석

This paper analyses the transient state of underground distribution system against single line to ground fault in underground transmission systems, when underground transmission systems and distribution systems are made of common grounding. Underground transmission systems and distribution systems are modeled by EMTP/ATPDraw. Simulation is carried out considering variation of parameters such as value of common grounding, balance load and unbalance load.