Voltage grading design of UHV surge arresters using 3D transient capacitive-resistive field simulations

Abstract

Numerical analysis of UHV gapless metal-oxide surge arresters have been performed utilizing capacitive-resistive coupling transient electric field simulations. The calculations are performed in 3D and for 3-phase installations. Two types of voltage grading methods for surge arresters have been studied, with grading rings and with external grading capacitors. The results show that important advantages like a shorter and lighter arrester with improved protection performance is possible to obtain using external grading capacitors instead of grading rings.

Design technique for leakage current reduction in surge arrester using gravitational search algorithm and imperialist competitive algorithm

“…However, many factors can cause the degradation of surge arresters and reduction in the stability of the arrester which is caused by non-uniformity of the voltage distribution (Illias et al, 2012). The non-uniform voltage distribution can be solved by adding grading rings to the surge arrester to reduce the effect of stray capacitance (Jinliang et al, 2006a;Sjöstedt et al, 2010). A possible factor of surge arrester degradation is moisture ingress due to weakening of the housing sealing, which can lead to internal discharges (Zeinoddini-Meymand et al, 2013).…”