Ambient Temperature Influence on Cable Trifurcating Joint Failures

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CIRED 2019 - 1718.pdf (707.33 KB)

Paper number

1718

Working Group Number

Conference name

CIRED 2019

Conference date

3-6 June 2019

Conference location

Madrid, Spain

Peer-reviewed

Yes

Short title

Convener

Authors

Tee, ShengJi, SP Energy Networks, United Kingdom
Bebbington, Malcolm, SP Energy Networks, United Kingdom
Neilson, David, SP Energy Networks, United Kingdom
Bryans, Russell, SP Energy Networks, United Kingdom
Jones, Matthew, SP Energy Networks, United Kingdom
Fox, Jonathan, SP Energy Networks, United Kingdom

Abstract

A significant volume of 33kV cable trifurcating joint failures has prompted investigations on failure cause. Through analysing historical failure records, the majority of the failures occurred in summer and in the evening/overnight/early morning. Failures appear to occur more frequently due to a combination of a higher absolute ambient temperature and a sustained period of large day/night temperature difference. These are prospective precursors to a relative saturation hysteresis phenomenon that lowers the dielectric strength of the oil-impregnated paper insulation in the joints, increasing the probability of dielectric failures.

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Publisher

AIM

Date

2019-06-03

Published in

CIRED 2019 Conference

Permanent link to this record

https://cired-repository.org/handle/20.500.12455/533
http://dx.doi.org/10.34890/755

ISSN

2032-9644

ISBN

978-2-9602415-0-1