Improved condition assessment of XLPE insulated cables using the isothermal relaxation current technique
Oyegoke, Bolarin S. (2006) Improved condition assessment of XLPE insulated cables using the isothermal relaxation current technique. In Sauers, I. (Ed.) IEEE Conference on Electrical Insulation and Dielectric Phenomena, 2006, 15-18 Oct 2006, Kanas City, Missouri, USA.
Well-known procedures using the isothermal relaxation current method (IRC) use an empirically-derived ageing factor (the A-factor) to estimate the condition of cables. The A-factor is calculated from plots of the product of instantaneous value of IRC and the time to that value from the start of the current, against the log of time. A-factors are computed from a standard formula using constants determined from curve fits of measured depolarization currents. From measurements of the breakdown strength of samples of real and degraded cables it has been found that A-factors do not provide reliable estimates of XLPE cable condition. However, if semi-conducting material of the cable insulation is known and cables are classified according to semi-conducting material type it is possible to get better correlation between conditions of cables as indicated by A-factors and AC breakdown voltage. This paper contains a novel analysis of result from previous researcher and also includes result from tests on other cables. The refined procedure is found to give reasonable value of A-factor for all cable tested.
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|Item Type:||Conference Paper|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering|
|Copyright Owner:||Copyright 2006 IEEE|
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|Deposited On:||11 Sep 2007 00:00|
|Last Modified:||03 Mar 2011 05:42|
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