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High frequency characterization of the semi-conducting screens of medium voltage XLPE cables
KTH, Superseded Departments, Electrical Systems.
KTH, Superseded Departments, Electric Power Systems.
ABB.
2002 (English)In: Electrical Insulation and Dielectric Phenomena, 2002 Annual Report Conference on, Cancun, 2002, 887-890 p.Conference paper, Published paper (Refereed)
Abstract [en]

In this study, a high frequency measurement technique to characterize the semi-conducting materials of the medium voltage XLPE cables in the frequency range of 30 kHz to 500 Mhz has been developed. The influence of the experimental set-up and the sample preparation methods are investigated. A dielectric response model is then developed for the semiconducting materials and this is incorporated into a model for the whole cable. The propagation characteristics obtained from the cable model are then compared with those obtained from measurements carried out on the actual XLPE cables.

Place, publisher, year, edition, pages
Cancun, 2002. 887-890 p.
Keyword [en]
Capacitance, Dielectric materials, Electric admittance, Electric potential, Permittivity, Semi-conducting screens, Electric cables
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-25302DOI: 10.1109/CEIDP.2002.1048937OAI: oai:DiVA.org:kth-25302DiVA: diva2:357228
Conference
2002 IEEE Conference on Electrical Insulation and Dielectric Phenomena; Cancun; 20 October 2002 through 24 October 2002
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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