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Measuring system for phase resolved partial discharge detection at low frequencies
KTH, Superseded Departments, Electrical Systems.
1999 (English)In: 11th International symposium on high voltage engineering, 1999, 5.228-5.231 p.Conference paper, Published paper (Other academic)
Place, publisher, year, edition, pages
1999. 5.228-5.231 p.
Series
IEE conference publication, ISSN 0537-9989
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-13116ISBN: 0-85296-719-5 (print)OAI: oai:DiVA.org:kth-13116DiVA: diva2:320953
Conference
International Symposium on High Voltage Engineering
Note
QC 20100527Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2010-05-27Bibliographically approved
In thesis
1. Partial Discharges Studied with Variable Frequency of the Applied Voltage
Open this publication in new window or tab >>Partial Discharges Studied with Variable Frequency of the Applied Voltage
2001 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This thesis concerns partial discharge (PD) diagnostics withvariable frequency of applied voltage in the frequency range 1mHz - 400 Hz. The exploration of a new type of spectroscopythat combines partial discharge analysis and dielectricresponse is demonstrated. A question addressed is if and howthe PD activity varies with the frequency of the appliedvoltage. The nature of an existing frequency dependence couldbe useful in the classification of different defects and tojudge the degree of progressive ageing.

A Variable-Frequency Phase Resolved Partial DischargeAnalysis (VF-PRPDA) technique is developed for the appliedvoltage frequency range 1 mHz - 400 Hz. The VF-PRPDA techniqueis combined with a system for high voltage dielectricspectroscopy that allows simultaneous measurements. TheVF-PRPDA technique is used for studying the frequencydependence of PD. The PD activity is for example measured byintegrated measures like total charge per cycle and totalnumber of discharges per cycle. Statistical measures like mean,standard deviation, skewness, kurtosis etc. are applied tomeasure the frequency dependence of the phasedistributions.

High voltage dielectric spectroscopy is supplemented withharmonic analysis for studying non-linear dielectric responsecurrents.

The VF-PRPDA technique is demonstrated on defined objectslike point-plane gaps and artificial voids, but also on aninsulated stator bar and a paper insulated cable. Surfacedischarges on insulating surfaces are studied in an environmentwith a controlled relative humidity and temperature. Theadsorption of moisture on the insulating surface alters thesurface conductivity of the surface and the frequencydependence of the PD activity.

The influence of temperature upon the PD activity is studiedfor a oil paper insulated cable.

The results of the measurements show that the partialdischarge activity in general is frequency dependent over thefrequency range 1 mHz - 400 Hz. The reasons behind thefrequency dependence are linked to surface- and bulk-conducting mechanisms, frequency dependent field distributionsand statistical effects of the supply of start electrons.

An algorithm is developed that relates the phase resolved PDcurrent measured with the PRPDA technique to the non-linearcurrent measured with dielectric spectroscopy. The algorithm isexperimentally verified by simultaneous measurements of PRPDAand dielectric spectroscopy on defined objects. The resultsexplain the contribution of PD to the apparent capacitance andloss. Moreover, the harmonics of the fundamental currentcomponent yield information about, for example, polaritydependent discharge sources.

Keywords:diagnostic methods, partial discharges, phaseresolved, variable frequency, dielectric spectroscopy,dielectric response, harmonics, insulation

Place, publisher, year, edition, pages
Stockholm: KTH, 2001. xiv, 163 p.
Series
Trita-EEA, 0102
Keyword
diagnostic methods, partial discharges, phase resolved, variable frequency, dielectric spectroscopy, dielectric response, harmonics, insulation
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-3207 (URN)
Public defence
2001-09-14, 00:00 (English)
Note
QC 20100527 NR 20140805Available from: 2001-09-07 Created: 2001-09-07 Last updated: 2010-05-27Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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Output format
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