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Diagnosis of moisture in oil/paper distribution cables-part I: Estimation of moisture content using frequency-domain spectroscopy
KTH, Superseded Departments, Electric Power Systems.
2004 (English)In: IEEE Transactions on Power Delivery, ISSN 0885-8977, E-ISSN 0885-8877, Vol. 19, no 1, 9-14 p.Article in journal (Refereed) Published
Abstract [en]

Dielectric spectroscopy (dielectric response measurements) has been applied for nondestructive estimation of humidity in oil-paper cable insulation. The experiments have been based upon two field-aged cables, 20 and 50 years old. Paper samples from these cables have been characterized and subjected to environments with different relative humidity. Dielectric loss and capacitance have been measured in a frequency range 1 MHz to 1 kHz and related to the moisture content determined by Karl Fisher titration. A method has been verified where the moisture content is correlated to the minimum value of loss tangent (tan 6). A number of field measurements have been performed where the method has been applied to estimate the moisture content in the distribution cables.

Place, publisher, year, edition, pages
2004. Vol. 19, no 1, 9-14 p.
Keyword [en]
dielectric response, Karl Fischer titration, mass impregnated cable, moisture content, oil paper insulation, transformers, insulation
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-23078DOI: 10.1109/tpwrd.2003.820417ISI: 000187886300002ScopusID: 2-s2.0-0346238593OAI: diva2:341776
QC 20100525 QC 20111101Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2011-11-01Bibliographically approved

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