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Electric Field in Polymeric Cable due to Space Charge Accumulation under DC and Temperature Gradient

Electric Field in Polymeric Cable due to Space Charge Accumulation under DC and Temperature Gradient
Electric Field in Polymeric Cable due to Space Charge Accumulation under DC and Temperature Gradient
When power cables are loaded under high voltage direct current (HVDC), an accumulation of space charge and a radial distribution of temperature gradient are developed across the insulation material. Such existence and accumulation of space charge within the insulating material poses a threat to the reliability of the operation of dc power cables. The electric field of a practical dc power cable is affected by the conductivity of the material, which is a function of both temperature and electric field. This causes difficulties in identifying the electric field distribution. In this paper, a method of determining the electric field distribution in dc power cables was proposed by considering the influence of space charge on the conductivity of the insulating material under different temperatures. Commercial 11 kV ac cross-linked polyethylene (XLPE) power cables were used and the space charge in these cables under dc conditions was measured using a modified pulsed electroacoustic (PEA) system with an attached current transformer. Therefore, a replica of a power cable under load conditions is obtained, which allows an investigation of the formation, migration and accumulation of space charge in a power cable with and without temperature gradients across the insulating material. COMSOL Multiphysics software package was used to accurately determine the electric field distribution in the dc power cable with consideration of the influence of electric field on the conductivity of the insulating material. The numerical modelling is based on the hopping conduction mechanism and its parameters were obtained from experiments carried out on the XLPE insulation material.
Space charge, electric fields, XLPE insulated power cable, conductivity, temperature gradient.
1070-9878
596-606
Choo, Wilson
24ec08eb-d40d-48df-a4f0-63d31c025485
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Swingler, Steve
4f13fbb2-7d2e-480a-8687-acea6a4ed735
Choo, Wilson
24ec08eb-d40d-48df-a4f0-63d31c025485
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Swingler, Steve
4f13fbb2-7d2e-480a-8687-acea6a4ed735

Choo, Wilson, Chen, George and Swingler, Steve (2011) Electric Field in Polymeric Cable due to Space Charge Accumulation under DC and Temperature Gradient. IEEE Transactions on Dielectrics & Electrical Insulation, 18 (2), 596-606.

Record type: Article

Abstract

When power cables are loaded under high voltage direct current (HVDC), an accumulation of space charge and a radial distribution of temperature gradient are developed across the insulation material. Such existence and accumulation of space charge within the insulating material poses a threat to the reliability of the operation of dc power cables. The electric field of a practical dc power cable is affected by the conductivity of the material, which is a function of both temperature and electric field. This causes difficulties in identifying the electric field distribution. In this paper, a method of determining the electric field distribution in dc power cables was proposed by considering the influence of space charge on the conductivity of the insulating material under different temperatures. Commercial 11 kV ac cross-linked polyethylene (XLPE) power cables were used and the space charge in these cables under dc conditions was measured using a modified pulsed electroacoustic (PEA) system with an attached current transformer. Therefore, a replica of a power cable under load conditions is obtained, which allows an investigation of the formation, migration and accumulation of space charge in a power cable with and without temperature gradients across the insulating material. COMSOL Multiphysics software package was used to accurately determine the electric field distribution in the dc power cable with consideration of the influence of electric field on the conductivity of the insulating material. The numerical modelling is based on the hopping conduction mechanism and its parameters were obtained from experiments carried out on the XLPE insulation material.

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Published date: March 2011
Keywords: Space charge, electric fields, XLPE insulated power cable, conductivity, temperature gradient.
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 272130
URI: http://eprints.soton.ac.uk/id/eprint/272130
ISSN: 1070-9878
PURE UUID: 53b2207b-656f-4fc5-ac8a-b6c894a0b7d9

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Date deposited: 29 Mar 2011 08:37
Last modified: 02 Dec 2019 21:00

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Contributors

Author: Wilson Choo
Author: George Chen
Author: Steve Swingler

University divisions

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