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Dependence of XLPE insulated power cable wave propagation characteristics on design parameters
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
Vattenfall.
2007 (English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 14, no 2, 393-399 p.Article in journal (Refereed) Published
Abstract [en]

Propagation losses occur in medium voltage power cables as pulses propagate through them. Since cables have many components, these can make different contributions to the propagation losses. The relative contributions of the conductors, insulation and semi-conducting screens to the propagation characteristics of the cable are analyzed. The propagation characteristics of the cables are studied by a developed "approximate" model providing analytical expressions that can quantify the contributions to the losses by the different parts of the conductor and dielectric system. The model is compared with an "exact" model and is tested on four cables. © 2007 IEEE.

Place, publisher, year, edition, pages
2007. Vol. 14, no 2, 393-399 p.
Keyword [en]
Attenuation, Dielectric, High frequency, Insulation, Phase velocity, Propagation characteristics, Semi-conducting screens, Series impedance, Shunt admittance, Dielectric materials, Electric insulation, Electric potential, Parameter estimation, Electric cables
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-25308DOI: 10.1109/TDEI.2007.344619ISI: 000245598900017Scopus ID: 2-s2.0-34147119069OAI: oai:DiVA.org:kth-25308DiVA: diva2:357234
Note
Tidigare titel: Modelling XLPE Insulated Power Cable Wave Propagation Characteristics(20101015) QC 20101015Available from: 2010-10-15 Created: 2010-10-15 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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