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Partial Discharges Studied with Variable Frequency of the Applied Voltage
KTH, Superseded Departments, Electrical Systems.
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 [en]
diagnostic methods, partial discharges, phase resolved, variable frequency, dielectric spectroscopy, dielectric response, harmonics, insulation
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-3207OAI: oai:DiVA.org:kth-3207DiVA: diva2:8984
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
List of papers
1. PD Detection vs. Loss Measurements at High Voltages with variable power frequencies
Open this publication in new window or tab >>PD Detection vs. Loss Measurements at High Voltages with variable power frequencies
1997 (English)In: International Symposium on High Voltage Engineering, 1997, 4.421-4.425 p.Conference paper, Published paper (Other academic)
Series
IEE conference publication, ISSN 0537-9989
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-13111 (URN)
Conference
10th International Symposium on High Voltage Engineering
Note
QC 20100527Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2010-05-27Bibliographically approved
2. Time domain PD-detection vs. dielectric spectroscopy
Open this publication in new window or tab >>Time domain PD-detection vs. dielectric spectroscopy
1997 (English)In: IEEE 1997 Annual Report: IEEE conference proceedings, 1997, 498-503 p.Conference paper, Published paper (Other academic)
Abstract [en]

A theoretically developed relationship between partial discharges and the response from a system for dielectric spectroscopy was experimentally confirmed. The losses caused by the discharges were highest at test voltages with low frequencies. At 0.1 Hz, tanδ tip-up at discharge inception was very difficult to observe. A very clear tip-up could be seen by detection of the third harmonic in the current through the test object. This is much more sensitive to the detection of internal partial discharges than traditional loss measurements, in particular when using low frequency test voltages

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-13112 (URN)10.1109/CEIDP.1997.641120 (DOI)0-7803-3851-0 (ISBN)
Conference
Conference on Electrical Insulation and Dielectric Phenomena
Note
QC 20100527Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2010-05-27Bibliographically approved
3. harmonic content in partial discharge current measured with dielectric spectroscopy
Open this publication in new window or tab >>harmonic content in partial discharge current measured with dielectric spectroscopy
1998 (English)In: Annual report. 1998, 1998Conference paper, Published paper (Other academic)
Abstract [en]

Phase resolved partial discharge analysis and dielectricspcctroscopy measurements have been performed at50Hz and variable voltage on two artificial defects thathave different average charge phase distributions. Influenceof partial discharges on permittivity and loss-factoris dcduced to the phase position of the partial dischargeactivity. Symmetry properties between positive andnegative charge distributions have been related to theharmonic content of the partial discharge current.

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-13113 (URN)0-7803-5036-7 (ISBN)0-7803-5035-9 (ISBN)0-7803-5037-5 (ISBN)
Conference
Conference on Electrical Insulation and Dielectric Phenomena
Note
QC 20100527Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2010-05-27Bibliographically approved
4. the influence of dielectric polarisation on the measured pd charge in a two-layer dielectric system
Open this publication in new window or tab >>the influence of dielectric polarisation on the measured pd charge in a two-layer dielectric system
1999 (English)In: Proceedings of Nordic Insulation Symposium, 1999, 433-441 p.Conference paper, Published paper (Other academic)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-13114 (URN)
Conference
Nordic Insulation Symposium
Note
QC 20100527Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2010-05-27Bibliographically approved
5. statistical analysis of partial discharges for the frequency range 1 Hz to 400 HZ
Open this publication in new window or tab >>statistical analysis of partial discharges for the frequency range 1 Hz to 400 HZ
1999 (English)In: : Proceedings of Nordic Insulation Symposium, 1999, 141-148 p.Conference paper, Published paper (Other academic)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-13119 (URN)
Conference
Nordic Insulation Symposium
Note
QC 20100527Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2010-05-27Bibliographically approved
6. Measuring system for phase resolved partial discharge detection at low frequencies
Open this publication in new window or tab >>Measuring system for phase resolved partial discharge detection at low frequencies
1999 (English)In: 11th International symposium on high voltage engineering, 1999, 5.228-5.231 p.Conference paper, Published paper (Other academic)
Series
IEE conference publication, ISSN 0537-9989
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-13116 (URN)0-85296-719-5 (ISBN)
Conference
International Symposium on High Voltage Engineering
Note
QC 20100527Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2010-05-27Bibliographically approved
7. influence of relative humidity on surface discharge over the frequency range 01 hz to 100 hz
Open this publication in new window or tab >>influence of relative humidity on surface discharge over the frequency range 01 hz to 100 hz
(English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135Article in journal (Other academic) Submitted
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-13117 (URN)
Note
QS 20120326Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2017-12-12Bibliographically approved
8. Simultaneous measurement of phase resolved partial discharges and dielectric spectroscopy
Open this publication in new window or tab >>Simultaneous measurement of phase resolved partial discharges and dielectric spectroscopy
(English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135Article in journal (Other academic) Submitted
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-13118 (URN)
Note
QS 20120326Available from: 2010-05-27 Created: 2010-05-27 Last updated: 2017-12-12Bibliographically approved

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