On-site diagnostics of medium-voltage underground cross-linked polyethylene cables

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TypeArticle
Journal titleIEEE Electrical Insulation Magazine
ISSN0883-7554
Volume27
Issue4
Pages3444; # of pages: 11
SubjectCrosslinked polyethylene; Diagnostic measurement; Insulation life; Medium-voltage underground power cable; Polarization and depolarization currents; Polymeric insulation; Cables; DC power transmission; Depolarization; Electric insulation; Plant extracts; Polarization; Power amplifiers; Thermoplastics; Underground cables; Polyethylenes
AbstractThe on-site diagnostics of medium-voltage underground cross-linked polyethylene cables were investigated. The measurement instrumentation, equipped with a portable generator and power amplifier for obtaining clean 60-Hz power and dc voltage up to -10 kV, can be fitted into a mid-size van. The connections to remote terminals, as far as 100 m from the van, are made by coaxial cable. The HF components of the depolarization current can have amplitudes of the order of amperes and a very short decay time, of the order of microseconds. The low-frequency components are of the order of picoamperes but of a much longer duration, of the order of tens of seconds. The increase of depolarization current magnitude with the poling time is an indication of the presence of slow dipolar polarization processes such as those involving hydrated ionic contaminants often found in water trees. The dependence of the depolarization current on the dc charging time indicated a significant population of water trees in the tested cables.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21271644
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Record identifier32171f1f-61b3-4563-bed2-09ded6c6510f
Record created2014-03-24
Record modified2016-05-09
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