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Extraction of the High Frequency Power Cable Characteristics from S-parameter Measurements
KTH, Superseded Departments, Electrical Systems.
KTH, Superseded Departments, Electrical Systems.
KTH, Superseded Departments, Electrical Systems.
KTH, Superseded Departments, Electrical Systems.
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2004 (English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 11, no 3, 461-470 p.Article in journal (Refereed) Published
Abstract [en]

A technique is developed for extraction of the wave propagation properties of power cables from S-parameter measurements. The method extracts the complex propagation constant and the characteristic impedance, as well as the LCRG Telegrapher's Equation parameters. The extraction process is developed after clarifying the effect of the connection between the measurement port and the power cable. It is concluded that treating the connection solely as a characteristic impedance change could lead to considerable errors in the parameter extraction. Furthermore, the method corrects for electrical lengths, which are not accounted for by the standard Network Analyzer calibration. The extraction is demonstrated for a medium voltage crosslinked polyethylene (XLPE) cable over the frequency range 300 kHz to 300 MHz. The results are compared to a time domain short pulse propagation method for cable characterization. Both measurement methods are evaluated against a cable model.

Place, publisher, year, edition, pages
2004. Vol. 11, no 3, 461-470 p.
Keyword [en]
Attenuation measurement, Cross linked polyethylene insulation, Parameter estimation, Power cables, Scattering parameters
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-5121DOI: 10.1109/TDEI.2004.1306724ISI: 000222131200008Scopus ID: 2-s2.0-3142739324OAI: oai:DiVA.org:kth-5121DiVA: diva2:7905
Note
QC 20100914Available from: 2005-05-18 Created: 2005-05-18 Last updated: 2017-12-04Bibliographically approved
In thesis
1. Techniques for Localization of Insulation Degradation along Medium-Voltage Power Cables
Open this publication in new window or tab >>Techniques for Localization of Insulation Degradation along Medium-Voltage Power Cables
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Time Domain Reflectometry (TDR) has been used for localization of transmission line discontinuities in diverse applications. Various challenges have to be addressed when applying TDR for localization of insulation degradation in power cables. The dominant problem is that TDR detects reflections coming from insulation changes, but it also records reflections related to geometrical irregularities along the cable length and, in some cases, surrounding medium variations. It is realized that one can compare TDR measurements before and after changes have occurred or have been induced in the aged sections. Thus the signals from the deteriorated insulation can be distinguished from other reflections that are constant.

The measurement technique to localize water-treeing in cross-linked polyethylene (XLPE) insulation is based on the voltage nonlinearity of water trees. TDR measurements have been performed before, after and during the application of high AC voltages. The high stresses affect the cable characteristic impedance and speed of wave propagation in the water-treed region. The possibility to detect local changes in the velocity of wave propagation has been presented as a technique for localization of insulation ageing. Localization of impedance changes related to water treeing and water ingress in mass impregnated paper insulated cables has also been achieved.

To characterize the power cables in the high frequency domain two parameter extraction methods have been developed. The first one uses TDR measurements and analyses short pulse propagation along the cable. The second one is based on the S-parameter measurements in the frequency domain. The methods extract the complex propagation constant and the characteristic impedance, as well as the LCRG Telegrapher's Equation parameters for the frequencies between 300 kHz and 300 MHz.

The dependence of the high frequency power cables properties on the metallic screen design and cable surrounding medium has been studied. The cable characteristics are modeled using time- and frequency-domain numerical simulations. This is required due to the complex spiralized structure of the outer metallic screen. It is established that this screen design causes a dependence of the cable characteristics on the surrounding medium.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. xii, 114 p.
Series
Trita-ETS, ISSN 1650-674X ; 2005:03
Keyword
Electrical power technology, Attenuation measurement, cross-linked polyethylene insulation, discontinuities, localization, mass-impregnated insulation, numerical analysis, parameter estimation, power cable metallic screen, scattering parameters, time domain reflectometry, velocity measurements, water treeing, Elkraftteknik
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-207 (URN)91-7178-044-0 (ISBN)
Public defence
2005-05-27, E1, Lindstedtsvägen 3, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20101012Available from: 2005-05-18 Created: 2005-05-18 Last updated: 2010-10-12Bibliographically approved

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