Analysis of Lightning Overvoltage with Earth of Overhead Grounding Wire and Installation Types of Arrester in Double Circuits Distribution Systems

2회선 배전계통에서 가공지선 접지 및 피뢰기 설치환경에 따른 뇌과전압 해석

This paper analyses the lightning overvoltage with earth of grounding wire and installation types of arresters in double circuits distribution systems. First, the model for analysis is selected severer case between upper line and lower line when the direct lightning surge strikes on the overhead grounding wire. The lightning overvoltage is variously calculated with earth distance between overhead grounding wires. This paper also analyses the effect of the installation distance between arrestors and the earth resistance of overhead grounding wire. From these results, authors examine the rationality of BIL that is applied in distribution system.