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Field model of partial discharges at variable frequency of the applied voltage
KTH, School of Electrical Engineering (EES).
KTH, School of Electrical Engineering (EES).
2005 (English)Conference paper, Published paper (Refereed)
Abstract [en]

In this paper the PD frequency dependence of acylindrical cavity in a delaminated insulation issimulated using a field model. It is shown how thestatistical time lag influences the PD frequencydependence. The technique of Variable FrequencyPhase Resolved Partial Discharge Analysis (VFPRPDA)is applied to a test object and measurementdata is compared with the results of the simulations.

Place, publisher, year, edition, pages
2005. 121-124 p.
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-8506OAI: oai:DiVA.org:kth-8506DiVA: diva2:13850
Conference
Nordic Insulation Symposium (Nord-IS), Trondheim, Norway, June 2005
Note
QC 20101129Available from: 2005-11-08 Created: 2005-11-08 Last updated: 2010-11-29Bibliographically approved
In thesis
1. Partial discharges in cylindrical cavities at variable frequency of the applied voltage
Open this publication in new window or tab >>Partial discharges in cylindrical cavities at variable frequency of the applied voltage
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Measurements of partial discharges are commonly used to diagnose the insulation system in high voltage components. Traditionally a single xed frequency of the applied voltage is used for such measurements as in the Phase Resolved Partial Discharge Analysis (PRPDA) technique. With the Variable Frequency Phase Resolved Partial Discharge Analysis (VF-PRPDA) technique the frequency of the applied voltage is instead variable. This technique provides more information about the condition of the insulation than the PRPDA technique. To extract the extra information a physical understanding of the frequency dependence of partial discharges is necessary.

In this thesis partial discharges in cylindrical cavities in polycarbonate are measured using the VF-PRPDA technique in the frequency range 10 mHz { 100 Hz. It is studied how the cavity diameter and height inuence the frequency dependence of partial discharges. Insulated cavities are compared with cavities bounded by an electrode. It is shown that from measurements at variable applied frequency it is possible to distinguish between cavities of di erent dimensions and between insulated and metal bounded cavities.

A two-dimensional eld model of partial discharges in a cylindrical cavity is developed. The sequence of discharges in the cavity is simulated by use of the eld computation program FEMLABR. Discharges are modeled with a voltage and current dependent streamer conductivity and are simulated dynamically to obtain charge and current consistency. It is shown that the frequency dependence of partial discharges is signi - cantly inuenced by the statistical time lag and by the two dielectric time constants related to charge movements on the cavity surface and in the bulk insulation. Simulation results are used to interpret the frequency dependent partial discharge activity in a cylindrical cavity.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. viii, 49 p.
Series
Trita-ETS, ISSN 1650-674X ; 2005:13
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:kth:diva-477 (URN)91-7178-169-2 (ISBN)
Presentation
2005-11-11, Sal H1, Teknikringen 33, Stockholm, 13:00
Opponent
Supervisors
Note
QC 20101129Available from: 2005-11-08 Created: 2005-11-08 Last updated: 2010-11-29Bibliographically approved

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  • apa
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