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Partial Discharge Testing of Insulator using MATLAB Simulink

Author(s):

Bhushan P Gaurkar , SHRI SAI COLLEGE OF ENGINEERING & TECHNOLOGY, BHADRAWTI; Umesh G Bonde, SHRI SAI COLLEGE OF ENGINEERING & TECHNOLOGY, BHADRAWTI

Keywords:

PD, HV rotating machine, MATLAB Simulink

Abstract

In high voltage electrical power system, variety of solid, liquid and gaseous materials are used for insulation purpose to protect the incipient failure inside the power equipment. Among these the solid insulation is widely used for high voltage power equipment in electrical power system. Most of insulating materials are not perfect in all respect and contains always some impurities. The presence of air bubble (void) is one of such impurities in insulating materials and highly undesirable for such type of insulation which causes a local weak zone inside the insulator. Insulation of the power equipment gradually degrades inside the insulator due to collective effect of electrical, chemical and thermal stress. Due to the high voltage stress the weak zone inside the insulator causes the partial discharge (PD) which is known as local electrical breakdown. As a result the insulation properties of such materials are enormously degrades its quality due to the PD. The established model of the flashover of an insulator, whose surface is covered with a moist, conducting layer of pollution, envisages that it develops from the formation and bridging of a dry band by a partial-arc pre-discharge. This pre-discharge is assumed to possess arc characteristics, so that the electric field across the dry band will fall as the partial arc current increases. Observations of insulators which are only lightly polluted, however, show that pre-discharges are of low luminosity and rich in ultraviolet, and resemble the spark leader inception and extension sequence in air gaps. This is because the current limitation by low values of surface-layer conductance can inhibit the transition to an arc at the pre-discharge stage. An alternative model using simplified voltage-current equations is developed to represent these spark properties rather than an arc characteristic. In this work, the simulation of PD activity due to presence of a small cylindrical and cubical void inside the solid insulation material of high voltage power equipment is studied with the MATLAB Simulink platform.

Other Details

Paper ID: IJSRDV5I60547
Published in: Volume : 5, Issue : 6
Publication Date: 01/09/2017
Page(s): 1150-1154

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