Condition assessment of XLPE insulated cables using isothermal relaxation current technique

Oyegoke, Bolarin S., Foottit, Elfrith, Birtwhistle, David, Lyall, James S., & Wickramasuriya, Prasanna B. (2006) Condition assessment of XLPE insulated cables using isothermal relaxation current technique. In Mercure, H. (Ed.) Power Engineering Society General Meeting, 2006, 18-22 June 2006, Montreal, Canada.


The isothermal relaxation current (IRC) method of assessing the condition of power cable insulation has been in use for more than 10 years. The method is based on a relaxation model of the thermal release of carriers from traps. An empirical aging factor often called A-factor determined from IRC analysis is investigated using measured depolarization currents from laboratory and field aged cables. Measurement results presented here indicate that calculation of A-factor depends on how well the software of the measuring system in IRC test set is able to approximate the measured depolarization current data. It is found that wrong approximation of measured data may result especially when the current decay is not monotonically decaying with time. For a better use of this equipment it is propose that the user make use of the raw depolarization current data instead of the A-factor output from the test system.

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ID Code: 9339
Item Type: Conference Paper
Refereed: No
Additional URLs:
Keywords: XLPE insulation, condition monitoring power cable insulation
ISBN: 1424404932
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2006 IEEE
Copyright Statement: Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Deposited On: 04 Sep 2007 00:00
Last Modified: 29 Feb 2012 13:23

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