Diagnosis of abnormal temperature rise observed on a 275 kV oil-filled cable surface - a case study
Diagnosis of abnormal temperature rise observed on a 275 kV oil-filled cable surface - a case study
This paper presents a case study on a 275 kV oil-filled cable. The condition assessment and diagnosis are based on analysis of cable surface temperature in relation to its current load and insulation dielectric loss. The work was initiated by a local abnormal temperature rise of 5.2 °C in cable surface temperature, which was observed during a routine inspection. The temperature rise occurred at bend area with a length of approximately one metre in the Blue phase. No PD activity was identified using on-line PD measurement. The relation between cable surface temperature, cable core temperature and cable insulation condition was then simulated based on the thermal model of power cables. According to simulation analysis, poor condition of cable insulation or oil from an oil duct penetrating a region under the cable surface were identified as possible reasons for the problem observed. An in service X-ray scanning technique was employed for further investigation and to aid diagnosis. The X-ray images revealed a slight distortion of the PVC sheath and the presence of multiple voids between cable insulation paper and the lead sheath. It was concluded that an oil leakage from the oil duct to the voids under the cable lead sheath was responsible for the local cable surface temperature rise. The result removed the concern of incipient cable breakdown, and a potential unplanned outage.
547-553
Yi, Huajie
9af48b7f-12bb-407d-83e0-d2339ff9d1ac
Zhou, Chengke
979212f2-4069-41f2-b42d-15c261b7826c
Hepburn, Donald M.
4d6d296f-f2d0-45ca-8ded-93e040f20e11
Kearns, Martin
b6f0aeb2-b3f7-4d8e-9a24-8a0c9279d101
Peers, Graham
010ef951-44f9-411f-a353-92f93257be21
6 March 2019
Yi, Huajie
9af48b7f-12bb-407d-83e0-d2339ff9d1ac
Zhou, Chengke
979212f2-4069-41f2-b42d-15c261b7826c
Hepburn, Donald M.
4d6d296f-f2d0-45ca-8ded-93e040f20e11
Kearns, Martin
b6f0aeb2-b3f7-4d8e-9a24-8a0c9279d101
Peers, Graham
010ef951-44f9-411f-a353-92f93257be21
Yi, Huajie, Zhou, Chengke, Hepburn, Donald M., Kearns, Martin and Peers, Graham
(2019)
Diagnosis of abnormal temperature rise observed on a 275 kV oil-filled cable surface - a case study.
IEEE Transactions on Dielectrics and Electrical Insulation, 26 (2), .
(doi:10.1109/TDEI.2018.007545).
Abstract
This paper presents a case study on a 275 kV oil-filled cable. The condition assessment and diagnosis are based on analysis of cable surface temperature in relation to its current load and insulation dielectric loss. The work was initiated by a local abnormal temperature rise of 5.2 °C in cable surface temperature, which was observed during a routine inspection. The temperature rise occurred at bend area with a length of approximately one metre in the Blue phase. No PD activity was identified using on-line PD measurement. The relation between cable surface temperature, cable core temperature and cable insulation condition was then simulated based on the thermal model of power cables. According to simulation analysis, poor condition of cable insulation or oil from an oil duct penetrating a region under the cable surface were identified as possible reasons for the problem observed. An in service X-ray scanning technique was employed for further investigation and to aid diagnosis. The X-ray images revealed a slight distortion of the PVC sheath and the presence of multiple voids between cable insulation paper and the lead sheath. It was concluded that an oil leakage from the oil duct to the voids under the cable lead sheath was responsible for the local cable surface temperature rise. The result removed the concern of incipient cable breakdown, and a potential unplanned outage.
Text
TDEI-7545 -reference revised-HuajieYi
- Accepted Manuscript
Restricted to Repository staff only
Request a copy
More information
Published date: 6 March 2019
Identifiers
Local EPrints ID: 498565
URI: http://eprints.soton.ac.uk/id/eprint/498565
ISSN: 1070-9878
PURE UUID: e708cb82-58b7-4b5c-a473-9a13c9938333
Catalogue record
Date deposited: 21 Feb 2025 17:31
Last modified: 22 Aug 2025 02:38
Export record
Altmetrics
Contributors
Author:
Huajie Yi
Author:
Chengke Zhou
Author:
Donald M. Hepburn
Author:
Martin Kearns
Author:
Graham Peers
Download statistics
Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.
View more statistics