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Study of a guarded electrode system in the dc conductivity measurement of insulating liquid

Study of a guarded electrode system in the dc conductivity measurement of insulating liquid
Study of a guarded electrode system in the dc conductivity measurement of insulating liquid
The design and choice of an electrode system is important in dc conductivity measurement of insulating liquid. In this paper, the electric field distribution of an electrode system which consists of two parallel circular metallic electrodes and a guard electrode has been studied using Comsol Multiphysics software. A new parameter, which is not yet involved in current standards, the edge radius, has been mentioned in the literature formerly and is currently discussed in a CIGRE working group. In this paper, the influence of this parameter has been investigated by means of field calculation. As seen from the simulating result, there are regions in the vicinity of the edges of the guard and measuring electrode that are under high electric field. If the edges of these two electrodes are sharp, the maximum electric field in the test cell will be much higher than the average field between the measuring electrode and the high voltage electrode. An empirical equation has been proposed to calculate this maximum field. The classic correction expression for an effective radius has been re-evaluated with the edge radius being taken into account. Experimental work has been performed to confirm this conclusion. Three kinds of mineral oils with different ageing times have been tested under the dc field using a guarded electrode system and the electric strengths of these oils have been estimated. A recommendation has been made to current standards in insulating liquid measurement
1361-6501
075005-[8pp]
Zhou, Y.
a5398d19-1c29-40ca-9c74-72a1fa2db5e6
Miao, Hao
0deb94c3-b94e-41d8-9c2e-032a0d0c0887
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Wilson, Gordon
fd02d259-a5b6-44ce-be29-47073c552c5b
Paul, Jarman
81bfdeca-5373-4e2c-a34f-507ca17d7b93
Zhou, Y.
a5398d19-1c29-40ca-9c74-72a1fa2db5e6
Miao, Hao
0deb94c3-b94e-41d8-9c2e-032a0d0c0887
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Wilson, Gordon
fd02d259-a5b6-44ce-be29-47073c552c5b
Paul, Jarman
81bfdeca-5373-4e2c-a34f-507ca17d7b93

Zhou, Y., Miao, Hao, Chen, G., Wilson, Gordon and Paul, Jarman (2014) Study of a guarded electrode system in the dc conductivity measurement of insulating liquid. Measurement Science and Technology, 25, 075005-[8pp]. (doi:10.1088/0957-0233/25/7/075005).

Record type: Article

Abstract

The design and choice of an electrode system is important in dc conductivity measurement of insulating liquid. In this paper, the electric field distribution of an electrode system which consists of two parallel circular metallic electrodes and a guard electrode has been studied using Comsol Multiphysics software. A new parameter, which is not yet involved in current standards, the edge radius, has been mentioned in the literature formerly and is currently discussed in a CIGRE working group. In this paper, the influence of this parameter has been investigated by means of field calculation. As seen from the simulating result, there are regions in the vicinity of the edges of the guard and measuring electrode that are under high electric field. If the edges of these two electrodes are sharp, the maximum electric field in the test cell will be much higher than the average field between the measuring electrode and the high voltage electrode. An empirical equation has been proposed to calculate this maximum field. The classic correction expression for an effective radius has been re-evaluated with the edge radius being taken into account. Experimental work has been performed to confirm this conclusion. Three kinds of mineral oils with different ageing times have been tested under the dc field using a guarded electrode system and the electric strengths of these oils have been estimated. A recommendation has been made to current standards in insulating liquid measurement

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Published date: 23 May 2014
Organisations: Faculty of Physical Sciences and Engineering

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Local EPrints ID: 364662
URI: http://eprints.soton.ac.uk/id/eprint/364662
ISSN: 1361-6501
PURE UUID: 98d15b7d-d425-402e-b512-918b1aebde62

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Date deposited: 09 Jun 2014 08:48
Last modified: 25 Nov 2019 20:43

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Contributors

Author: Y. Zhou
Author: Hao Miao
Author: G. Chen
Author: Gordon Wilson
Author: Jarman Paul

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