Diagnosis of abnormal temperature rise observed on a 275 kv oil-filled cable surface: a case study

Huajie Yi, Chengke Zhou, Donald M. Hepburn, Martin Kearns, Graham Peers

Research output: Contribution to journalArticle

6 Downloads (Pure)

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.
Original languageEnglish
Pages (from-to)547-553
Number of pages7
JournalIEEE Transactions on Dielectrics and Electrical Insulation
Volume26
Issue number2
Early online date6 Mar 2019
DOIs
Publication statusPublished - Apr 2019

Fingerprint

Oil filled cables
Cables
Insulation
Temperature
Ducts
Lead
Cable cores
X rays
Dielectric losses
Outages
Polyvinyl chlorides

Keywords

  • oil filled cables
  • cable insulation
  • temperature measurement
  • liquid leak
  • X-ray imaging

Cite this

@article{ec38f9b64e3b4c649366976bb094a2e0,
title = "Diagnosis of abnormal temperature rise observed on a 275 kv oil-filled cable surface: a case study",
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.",
keywords = "oil filled cables, cable insulation, temperature measurement, liquid leak, X-ray imaging",
author = "Huajie Yi and Chengke Zhou and Hepburn, {Donald M.} and Martin Kearns and Graham Peers",
note = "Acceptance in SAN",
year = "2019",
month = "4",
doi = "10.1109/TDEI.2018.007545",
language = "English",
volume = "26",
pages = "547--553",
journal = "IEEE Transactions on Dielectrics and Electrical Insulation",
issn = "1070-9878",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "2",

}

Diagnosis of abnormal temperature rise observed on a 275 kv oil-filled cable surface: a case study. / Yi, Huajie; Zhou, Chengke; Hepburn, Donald M.; Kearns, Martin; Peers, Graham.

In: IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 26, No. 2, 04.2019, p. 547-553.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Diagnosis of abnormal temperature rise observed on a 275 kv oil-filled cable surface: a case study

AU - Yi, Huajie

AU - Zhou, Chengke

AU - Hepburn, Donald M.

AU - Kearns, Martin

AU - Peers, Graham

N1 - Acceptance in SAN

PY - 2019/4

Y1 - 2019/4

N2 - 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.

AB - 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.

KW - oil filled cables

KW - cable insulation

KW - temperature measurement

KW - liquid leak

KW - X-ray imaging

U2 - 10.1109/TDEI.2018.007545

DO - 10.1109/TDEI.2018.007545

M3 - Article

VL - 26

SP - 547

EP - 553

JO - IEEE Transactions on Dielectrics and Electrical Insulation

JF - IEEE Transactions on Dielectrics and Electrical Insulation

SN - 1070-9878

IS - 2

ER -