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access icon openaccess Dynamics of surface charge and electric field distributions on basin-type insulator in GIS/GIL due to voltage polarity reversal

This is an open access article published by the IET and CEPRI under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 19/08/2019, Accepted 07/02/2020, Revised 30/01/2020, Published 12/02/2020

In this study, a simulation model of surface charge accumulation has been established. The model considers three accumulation ways, i.e. electrical conduction within the gas, through insulator volume and along the insulator surface. The generation, diffusion, drift and recombination of charge carriers are also taken into account. Based on it, the influence of polarity reversal, reversal time on surface charge and electric field distribution on a basin-type insulator are studied. The polarity of the surface charges and the direction of the electric field change after the voltage polarity reversal. When the preload voltage is equal to reversal voltage, the surface charge and the electric field distributions at steady state before and after voltage polarity reversal are all the same with opposite sign, and not affected by the reversal time. However, the time to reach the steady state varies with different reversal time. The steady-state surface charge and electric field increased with the rise of reversal voltage. The transient normal and tangential electric field would not exceed the value of the steady state, which means voltage polarity reversal has no additional influence on insulation performance. This research can provide guidance to the design and manufacture of DC GIS/GIL.

Inspec keywords: insulators; surface charging; electric fields; gas insulated switchgear; gas insulated transmission lines; electrical conductivity

Other keywords: electrical conduction; voltage polarity reversal; surface charge accumulation; steady state; charge carriers; basin-type insulator; steady-state surface charge; insulator surface; electric field change; different reversal time; electric field distribution; tangential electric field; reversal voltage

Subjects: Power line supports, insulators and connectors; Switchgear

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