Case Studies Reducing The Impact of Lightning On Distribution System by Down Conductor Improvement
Arnon Songsang ¹ Nattachote Rugthaichareoncheep ^1* and Att Phayomhom ^2
1 Department of Electrical Engineering, Faculty of Engineering Rajamangala University of Technology Phra Nakhon, Bangkok.
² Metropolitan Electricity Authority Pleonchit Road, Lumpini, Patumwan, Bangkok.

Abstract

This paper presents the study on reducing the lightning impact in distribution systems by down conductor improvement and the interference of lightning on power quality by impulse surface flashover on suspension insulators. This causes the induced voltages in distribution systems. The paper also presents a technique of attachment on external down conductor connecting between overhead ground wires and ground rods to reduce the back flashovers. The study has been done by ATP-EMTP simulation in 69 kV system of Metropolitan Electricity Authority (MEA).The results show that the external down conductor can reduce the pole top voltages and back flashover in distribution systems.