Electrical Performance of Porcelain Surge Arrester in 22 kV Distribution System under Contaminated Conditions

Wichet Thipprasert,Prakasit Sritakaew

doi:10.4236/jpee.2015.35007

Abstract

Stability and reliability of distribution system are able to be improved by many protective devices including insulators, relay and surge arrester (SA). SA is used for protection of lightning and switching surge in Provincial Electricity Au-thority (PEA). This paper presents an experimental investigation of 22 kV distribution SA electrical performances under pollution conditions according to IEC 60507. The experimental results of leakage currents more than 6 mA at Equiva-lent Salt Deposit Density (ESDD) 0.6 mg/cm2 at nominal voltage. These data will be useful to be guideline for solving problems and reducing power loss from leakage current on the surface of SAs as a result of surface dirt and pollution. Moreover, it will be useful to select or design suitable SAs for using in places with salt conditions, high rainfall, high wind speeds and high humidity.

Highlights

Electric power is an important ingredient for the industry and all round development of a country
In this paper to study of leakage current and temperature absorption of porcelain surge arrester under polluted condition using spraying method [2]-[5]
The third basic phenomenon related to Metal Oxide Surge Arresters (MOSAs) operating in polluted conditions is the temperature rise that may occur due to the uneven voltage distribution created by surface leakage currents

Summary

Introduction

Electric power is an important ingredient for the industry and all round development of a country. In the past in pollution research of MOSAs, a lot of attention was paid to the coupling in of currents at the flanges of a multi-unit arrester with the porcelain housings non-uniformly polluted. Adiabatic heating due to leakage current and dry band arcing causing flashover on the housing and imbalance in heat energy distribution with absorption in varistors, leads to Stress degradation and thermal runaway. In this paper to study of leakage current and temperature absorption of porcelain surge arrester under polluted condition using spraying method [2]-[5]. To guideline for solving problems above, in this work to study Evaluation of Leakage Current Measurement of Porcelain Surge Arrester for Site Pollution Severity Assessment testing by setup the artificial pollution chamber based on IEC 60507

Properties of MOASs in Polluted Conditions

Test Setup

Test Procedures

Test Results of Porcelain Surge Arrester