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Comparing two measurement techniques for high frequency characterization of power cable semi-conducting and insulating materials
KTH, School of Electrical Engineering (EES).
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
Vattenfall.
2006 (English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 13, no 4, 712-716 p.Article in journal (Refereed) Published
Abstract [en]

Understanding the high frequency characteristics of the materials that make up medium voltage extruded cables is important in establishing diagnostics schemes based on electromagnetic pulse propagation methods. Two measurement techniques have been developed and used to characterize the high frequency material properties of semi-conducting screens and cross linked polyethylene (XLPE) insulation up to 100 MHz. The experimental details, parameter extraction and limitations of the two measurement techniques are presented.

Place, publisher, year, edition, pages
2006. Vol. 13, no 4, 712-716 p.
Keyword [en]
complex permittivity, scattering parameters, insulation, semi-conducting, two-port, one-port, high frequency, measurements, characterization
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-15913DOI: 10.1109/TDEI.2006.1667728ISI: 000239705700004Scopus ID: 2-s2.0-33748323309OAI: oai:DiVA.org:kth-15913DiVA: diva2:333955
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically 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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