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High frequency characterization of medium voltage cables using time domain Reflectometry techniques
KTH, Superseded Departments, Electrical Systems.
KTH, Superseded Departments, Electrical Systems.
2001 (English)In: 17th Nordic Insulation Symposium(NORD-IS 01), Stockholm, Sweden, 2001, 211-218 p.Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
2001. 211-218 p.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-25298OAI: oai:DiVA.org:kth-25298DiVA: diva2:357216
Conference
17th Nordic Insulation Symposium(NORD-IS 01), Stockholm, Sweden, 11/6-13/6
Note
QC 20101015Available from: 2010-10-15 Created: 2010-10-15 Last updated: 2010-10-18Bibliographically approved
In thesis
1. High frequency characteristics of medium voltage XLPE power cables
Open this publication in new window or tab >>High frequency characteristics of medium voltage XLPE power cables
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The response of a cable can be used to analyze the variation of the material characteristics along its length. For diagnosis of possible ageing, it is necessary to know how cable design, material properties and cable insulation ageing affects the wave propagation. A cable model has therefore been worked out based upon the high frequency properties of the cable insulation and conductor systems. The high frequency characteristics of the semi-conducting screens, new and water-tree aged cross-linked polyethylene (XLPE) insulation have been determined by two measuring techniques. Semi-conducting screens have a great influence on the attenuation of cables at high frequencies.

A dielectric function based on an empirical formula is fitted to the measured characteristics of the semi-conducting screens. The dielectric function is used in the cable model set-up to predict the propagation constant of the cables.

The high frequency characteristics of the water-tree degraded XLPE insulation obtained from measurements are related to the water content of the water trees of the samples. An effective materials model is developed to estimate the water content of the water trees and the conductivity of the water.

The propagation constant from the cable model is compared to the propagation constant obtained from measurements made on cables. Using approximate high frequency cable models, the relative contributions of the conductor and insulation systems to the attenuation and phase velocity of the cables are analyzed.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. 93 p.
Series
Trita-ETS, ISSN 1650-674X ; 2005:17
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-560 (URN)91-7178-215-X (ISBN)
Public defence
2005-12-20, Sal D2, Lindstedtsvägen 5, Stockholm, 10:15
Opponent
Supervisors
Note
QC 20101018Available from: 2005-12-14 Created: 2005-12-14 Last updated: 2010-10-18Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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More styles
Language
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  • Other locale
More languages
Output format
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