Comparison on space charge and voltage distribution of high voltage insulator subjected to different contamination levels

N A Samuri,N A M Jamail,M A M Piah,Nordiana Azlin Binti Othman,H Rosli

doi:10.11591/eei.v8i3.1585

Abstract

This paper presents the study of space charge distribution on high voltage (HV) insulators under different levels of contamination. Two types of HV insulators were used in this work particularly glass and porcelain insulators. A string of 4-unit glass and porcelain insulators with 33 kV of lines voltage was designed and simulated using QuickfieldTM software. Four levels of contamination layer with different thickness have been applied on the surface of insulators to observe the effect of space charge distribution. Simulation results show that different types of insulators used at transmission lines give different effects on charge and voltage distribution. It is also found that the amplitude of charge for a single porcelain insulator is much higher compared to a single glass insulator. Similarly for a string of 4-unit insulators, the voltage distribution along the creepage distance of porcelain insulators is much higher compared to glass insulators under all contamination levels.

Highlights

High voltage (HV) insulators glass and porcelain play a significant role in electric power transmission system
The high voltage string insulators with four units of glass and porcelain were simulated on voltage distribution, and it is shown that the higher chances of breakdown at glass insulator
The electric stress at glass insulator for all contamination levels are higher than porcelain insulator

Summary

INTRODUCTION

High voltage (HV) insulators glass and porcelain play a significant role in electric power transmission system. An inherent nature of insulator that tends to accumulate the trapped electrical charges within the insulation material has led the space charge existence. The presence of space charge at any region of insulator is certainly distort the original electric field distribution and may result in the enhancement of local electric fields to the highest level over a long period of time. This situation would leads to the premature failure. This paper proposes a study on the voltage and space charge distribution on HV glass and porcelain insulators subjected to different levels of contamination

MODELLING DESIGN

RESULTS AND ANALYSIS

CONCLUSION