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International Journal of

Recent Trends in Engineering

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International Journal of Recent Trends in Engineering (IJRTE)

ISSN 1797-9617

Volume 1,  Number 4,  May 2009

Issue on Electrical & Electronics

Page(s): 1-3

A Novel Analysis of Voltage Distribution in Zinc Oxide Arrester using Finite Element method

           R.Karthik

Full text:  PDF

Abstract

Necessity to preserve the continuity of service and electric supply demands special attention towards protection of transmission lines and power apparatus from over voltages.

Lightning arresters are devices used at sub-stations and at line terminations to discharge these over voltages, more particularly lightning surges and switching surges.  The arresters installed today are almost all metal- oxide (MO) arresters without gaps. The distinctive feature of MO resistors is its extremely non-linear voltage characteristics, rendering unnecessary the disconnection of the resistors from the line through serial spark–gaps earlier used with Sic resistors.

“Ref. [1]”The voltage distribution in a zinc oxide arrester under normal operating conditions has been observed to be non-uniform. The disc at the top are subject to higher voltage and hence thermal stresses leading to faster thermal ageing of these highly stressed disc’s, therefore efforts are made to make the voltage distribution as uniform as possible.

Lightning arresters for 110 kV, 220 kV, 380 kV systems were considered on application of maximum continuous operating voltage. For 220 kV, 380 kV system arresters, observation of voltage distribution showed that voltage level to be high at the top discs of the arrester, which will lead to damage of arresters. For stress to be relieved and voltage to be distributed uniformly through out the discs of arrester ‘Grade Rings’ are employed .These grade rings control the voltage distribution from top to bottom of the arrester and uniform voltage distribution is achieved. In this paper an analysis of voltage distribution in lightning Arrester is done with the help of state of art of technology ANSYS7.1 which analysis through analytical method with Finite element as basics

Index Terms

Arrester,Finite Element method,Grade  rings.

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