Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Measurement technique for high frequency characterization of semi-conducting materials in extruded cables
KTH, Superseded Departments, Electrical Systems.
KTH, Superseded Departments, Electric Power Systems.
ABB.
Vattenfall.
2004 (English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 11, no 3, 471-480 p.Article in journal (Refereed) Published
Abstract [en]

Knowledge on the dependence of wave propagation characteristics on material properties and cable design is important in establishing diagnostic methods for cable insulation. In this study, a high frequency measurement technique to characterize the semi-conducting screens in medium voltage cross-linked polyethylene (XLPE) cables has been developed. The frequency ranges from 30 kHz to 500 MHz. The influence of the experimental set-up, sample preparation methods, pressure and temperature are investigated. A dielectric function is developed for the semiconducting screens and this is incorporated into a high frequency model for the cable. The propagation characteristics obtained from the high frequency cable model are compared with those obtained from measurements made on the same cables.

Place, publisher, year, edition, pages
2004. Vol. 11, no 3, 471-480 p.
Keyword [en]
semi-conducting screen, semicon, geometric capacitance, admittance, complex permittivity, dielectric function, propagation constant, attenuation, high frequency cable model, scattering parameters, cross-linked polyethylene, XLPE, cables
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-23514DOI: 10.1109/TDEI.2004.1306725ISI: 000222131200009Scopus ID: 2-s2.0-3142685105OAI: oai:DiVA.org:kth-23514DiVA: diva2:342212
Note
QC 20100525 QC 20111026Available from: 2010-08-10 Created: 2010-08-10 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

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Mugala, GavitaEriksson, Roland
By organisation
Electrical SystemsElectric Power Systems
In the same journal
IEEE transactions on dielectrics and electrical insulation
Other Electrical Engineering, Electronic Engineering, Information Engineering

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 87 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf