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Trapping parameters and their relation to insulation status of XLPE cables

Trapping parameters and their relation to insulation status of XLPE cables
Trapping parameters and their relation to insulation status of XLPE cables
Space charge issues have raised many attentions in recent years, especially in high voltage direct current (HVDC) application. Space charge accumulation in insulation system will give rise to acceleration of ageing and even cause premature failure of the material. However, from another angle, space charge might be also considered as a diagnostic
tool of ageing for insulation materials. In this paper, a trapping-detrapping model has been developed to estimate
trapping parameters of cross-linked polyethylene (XLPE) cable sections, which were taken from different HVAC operation conditions of 12 years and 8 years. The results reveal that, for both cable sections, samples from the inner location have the greatest trap density and the deepest trap depth. Additionally, breakdown strength tests and FTIR (Fourier- transform infrared) measurements on those samples have been carried out. From FTIR measurement results, the degree of oxidation among three layers could be found by the carbonyl index values. The oxidation degree of aged cable at the outer layer is higher than that at the other two layers probably because of the most sufficient contact with oxygen. Also, it has been noticed that the results from these measurements show some correlations with the estimated trapping parameters, especially for breakdown strength.
1003-6520
1154-1166
Liu, Ning
b4cdf4f9-bc5e-46c5-bd88-ed4d29074a85
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Xu, Yang
61510c27-6d1e-4d23-aded-65e5469bef1d
Liu, Ning
b4cdf4f9-bc5e-46c5-bd88-ed4d29074a85
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Xu, Yang
61510c27-6d1e-4d23-aded-65e5469bef1d

Liu, Ning, Chen, George and Xu, Yang (2015) Trapping parameters and their relation to insulation status of XLPE cables. High Voltage Engineering, 41 (4), 1154-1166. (doi:10.13336/j.1003-6520.hve.2015.04.013).

Record type: Article

Abstract

Space charge issues have raised many attentions in recent years, especially in high voltage direct current (HVDC) application. Space charge accumulation in insulation system will give rise to acceleration of ageing and even cause premature failure of the material. However, from another angle, space charge might be also considered as a diagnostic
tool of ageing for insulation materials. In this paper, a trapping-detrapping model has been developed to estimate
trapping parameters of cross-linked polyethylene (XLPE) cable sections, which were taken from different HVAC operation conditions of 12 years and 8 years. The results reveal that, for both cable sections, samples from the inner location have the greatest trap density and the deepest trap depth. Additionally, breakdown strength tests and FTIR (Fourier- transform infrared) measurements on those samples have been carried out. From FTIR measurement results, the degree of oxidation among three layers could be found by the carbonyl index values. The oxidation degree of aged cable at the outer layer is higher than that at the other two layers probably because of the most sufficient contact with oxygen. Also, it has been noticed that the results from these measurements show some correlations with the estimated trapping parameters, especially for breakdown strength.

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Published date: 30 April 2015
Organisations: EEE

Identifiers

Local EPrints ID: 380080
URI: http://eprints.soton.ac.uk/id/eprint/380080
ISSN: 1003-6520
PURE UUID: 563b7b72-8b79-4b9c-abf2-13b4f44ae2a1

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Date deposited: 03 Sep 2015 10:52
Last modified: 07 Oct 2019 18:27

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