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Numerical modelling of needle-grid electrodes for negative surface corona charging system

Numerical modelling of needle-grid electrodes for negative surface corona charging system
Numerical modelling of needle-grid electrodes for negative surface corona charging system
Surface potential decay measurement is a simple and low cost tool to examine electrical properties of insulation materials. During the corona charging stage, a needle-grid electrodes system is often used to achieve uniform charge distribution on the surface of the sample. In this paper, a model using COMSOL Multiphysics has been developed to simulate the gas discharge. A well-known hydrodynamic drift-diffusion model was used. The model consists of a set of continuity equations accounting for the movement, generation and loss of charge carriers (electrons, positive and negative ions) coupled with Poisson’s equation to take into account the effect of space and surface charges on the electric field. Four models with the grid electrode in different positions and several mesh sizes are compared with a model that only has the needle electrode. The results for impulse current and surface charge density on the sample clearly show the effect of the extra grid electrode with various positions.
1742-6588
12011
Zhuang, Yuan
fd738637-e5e3-4c0a-ad8e-e011ab0b1314
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Rotaru, Mihai
c53c5038-2fed-4ace-8fad-9f95d4c95b7e
Zhuang, Yuan
fd738637-e5e3-4c0a-ad8e-e011ab0b1314
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Rotaru, Mihai
c53c5038-2fed-4ace-8fad-9f95d4c95b7e

Zhuang, Yuan, Chen, George and Rotaru, Mihai (2011) Numerical modelling of needle-grid electrodes for negative surface corona charging system. Journal of Physics: Conference Series, 310, 12011.

Record type: Article

Abstract

Surface potential decay measurement is a simple and low cost tool to examine electrical properties of insulation materials. During the corona charging stage, a needle-grid electrodes system is often used to achieve uniform charge distribution on the surface of the sample. In this paper, a model using COMSOL Multiphysics has been developed to simulate the gas discharge. A well-known hydrodynamic drift-diffusion model was used. The model consists of a set of continuity equations accounting for the movement, generation and loss of charge carriers (electrons, positive and negative ions) coupled with Poisson’s equation to take into account the effect of space and surface charges on the electric field. Four models with the grid electrode in different positions and several mesh sizes are compared with a model that only has the needle electrode. The results for impulse current and surface charge density on the sample clearly show the effect of the extra grid electrode with various positions.

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Published date: 12 August 2011
Organisations: Electronics & Computer Science, EEE

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Local EPrints ID: 272669
URI: http://eprints.soton.ac.uk/id/eprint/272669
ISSN: 1742-6588
PURE UUID: 020ddfe1-b7b1-4d4e-8fce-bb4d8967a386

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Date deposited: 16 Aug 2011 08:38
Last modified: 09 Dec 2019 20:08

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