Computational Study of 400 kV Transmission Lines Against Lightning with Line Terminating Matrix

摘要

The main object of this paper is to analyse the impact of tower type (geometry of the tower) against lightning by studying one of its major factors, self and mutual impedances by taking geometry of the practical 400 kV, D/c, 2 ground wire tower in Hyderabad, Telangana, India.This paper also focuses to present PSCAD/EMTDC based transient multiconductor modelling of a three phase double circuit for analysing transmission line performance during lightning of say 100 kA, 8/20μs as well as recovery of the string voltage at the tower with the placement of transmission line arresters, when back flashover was triggered into one of the phases of a chosen tower. A comparison was made with respect to tower footing resistance ranging from 10Ω to 100Ω by varying arc horn gap length which is considered to be an important factor in this model as arrester can perform well in a high tower footing resistance area.