Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Influence of cavity size and cavity location on partial discharge frequency dependence
KTH, Superseded Departments, Electrical Systems.
KTH, Superseded Departments, Electrical Systems.
2004 (English)In: 2004 ANNUAL REPORT CONFERENCE ON ELECTRICAL INSULATION AND DIELECTRIC PHENOMENA, New York: IEEE , 2004, 438-441 p.Conference paper, Published paper (Refereed)
Abstract [en]

Variable frequency phase resolved partial discharge analysis (VF-PRPDA) is a partial discharge measurement technique where the frequency of the applied voltage is variable. In this paper, the VF-PRPDA technique is applied to a test object containing a cylindrical cavity in an otherwise homogeneous insulation of polycarbonate. The frequency is varied in the range 10 mHz-100 Hz. It is shown how the frequency dependence of PD is influenced by the cavity diameter and the cavity location in relation to the electrodes. The PD frequency dependence is also numerically modeled for an isolated cylindrical cavity with diameter 1.5 mm using a field model.

Place, publisher, year, edition, pages
New York: IEEE , 2004. 438-441 p.
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:kth:diva-8505DOI: 10.1109/CEIDP.2004.1364281ISI: 000225187200105Scopus ID: 2-s2.0-17744387318ISBN: 0-7803-8584-5 (print)OAI: oai:DiVA.org:kth-8505DiVA: diva2:13849
Conference
Annual Conference on Electrical Insulation and Dielectric Phenomena (CEIDP) Boulder, CO, OCT 17-20, 2004
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

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Forssén, CeciliaEdin, Hans
By organisation
Electrical Systems
Condensed Matter Physics

Search outside of DiVA

GoogleGoogle Scholar

doi
isbn
urn-nbn

Altmetric score

doi
isbn
urn-nbn
Total: 108 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf