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A Study on the Lightning Overvoltage Analysis and Lightning Surge Protection Methods in 22.9kV Underground Distribution Systems  

김상국 (원광대학 전기공학과)
정채균 (원광대학 전기공학)
이종범 (원광대학 전기공학)
박왈서 (원광대학 전기공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers A / v.53, no.8, 2004 , pp. 454-460 More about this Journal
Abstract
The effects of surge arresters for protection of transmission systems against direct lightning strokes have already been reviewed using Electromagnetic Transients Program(EMTP). Distribution lines are spanned in much larger area than transmission lines, and therefore, are more susceptible to lightning strokes. We have modelled the 22.9kV underground distribution cable systems that have arresters and grounding wires. And this paper analyzes the overvoltages on underground distribution cable systems when direct lightning strokes strike on the overhead grounding wire using EMTP. Then we investigated that (1) the effects of lightning stroke according to underground distribution cable length (2) voltages at the riser pole and at the cable terminal according to installation of arrester. This study will provide insulation coordination methods for reasonable systems design in 22.9kV underground distribution cable systems.
Keywords
Insulation Coordination; Underground Distribution Systems; Lightning Surge; Arrester;
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