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Effect of HV Impulses on Partial Discharge Activity in Oil-Impregnated Paper Insulation
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. (Electrical Systems)
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

High voltage (HV) transients in electrical power systems are mainly caused by lightning strikes and switching operations.  The high voltage transient from its point of origin can propagate in either direction in the electrical power transmission line, and if its magnitude would be below the Basic Insulation Level (BIL) of the equipment for impulse voltage, it can reach the terminals of the equipment without being dissipated by surge arresters.  The dielectric properties of a particular insulation at the instant of interaction with a high voltage transient would determine the level of the degradation of the electrical insulation caused by the high voltage transient. This thesis suggests on-line diagnostic techniques for monitoring the oil-impregnated paper condenser bushings by utilizing the naturally occurring HV transients in electrical power systems.

The aim of the first experiment was to investigate the partial discharge (PD) characteristics of the PD defects which are likely to be found in oil-imregnated paper condenser bushings. In order to understand the condition at which the HV impulses would cause the change in phase resolved partial discharge (PRPD) patterns, four more experiments were performed. The second experiment was set in such a way that the effect of HV impulses alone could be investigated. On the other hand, the third experiment was set to examine the effect of PD-ageing at elevated AC voltage. The fourth experiment aimed in investigating the effect of combined PD-ageing at elevated AC voltage and the HV impulses. In order to investigate how different electrical stresses affect the dielectric properties of the oil-impreganted paper insulation, the fifth experiment about the dielectric spectroscopy (DS) in frequency domain was performed.

The measurement results presented in this thesis show that high voltage impulses can have a large impact on the behavior of PRPD patterns if the test sample is aged by partial discharges, but a smaller impact when the test sample is unaged. The measurement results also show that the degradation of the oil-impregnated papers is much faster when the oil-impregnated papers are suffered from the combination of the HV impulses and the PD activity at elevated AC voltage than when they are suffered from the PD activity at elevated AC voltage alone.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. , viii, 70 p.
Series
Trita-EE, ISSN 1653-5146 ; 2012:054
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-104829ISBN: 978-91-7501-543-9 (print)OAI: oai:DiVA.org:kth-104829DiVA: diva2:567629
Presentation
2012-11-30, H21, Teknikringen 33, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Note

QC 20121115

Available from: 2012-11-15 Created: 2012-11-13 Last updated: 2012-11-16Bibliographically approved
List of papers
1. Comparison of phase resolved partial discharge patterns in small test samples, bushing specimen and aged transformer bushing
Open this publication in new window or tab >>Comparison of phase resolved partial discharge patterns in small test samples, bushing specimen and aged transformer bushing
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2012 (English)In: 2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), IEEE , 2012, 88-91 p.Conference paper, Published paper (Refereed)
Abstract [en]

The transformer bushings are one of the key devices in electrical power networks. With time, the electrical insulations in the transformer bushings become aged. One effect of a long time ageing would be due to Partial Discharge (PD) defects. In this work, the phase resolved partial discharge (PRPD) pattern of the defects naturally present in an aged 36 kV Oil Impregnated Paper (OIP) bushing was compared with the PRPD patterns of defects deliberately introduced in simple test samples and in a bushing specimen. The results presented in this paper show that it might be possible to predict the type of the defects in aged transformer bushings through comparing measured PRPD patterns with PRPD patterns from defects deliberately introduced in simple test samples and in bushing specimens.

Place, publisher, year, edition, pages
IEEE, 2012
Series
Conference on Electrical Insulation and Dielectric Phenomena. Annual Report, ISSN 0084-9162
Keyword
Electrical power networks, Oil impregnated papers, Phase resolved partial discharge patterns, PRPD patterns, Test samples, Transformer bushings
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-104837 (URN)10.1109/CEIDP.2012.6378729 (DOI)000316899800018 ()2-s2.0-84872092506 (Scopus ID)978-1-4673-1252-3 (ISBN)
Conference
2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012; Montreal, QC; Canada; 14 October 2012 through 17 October 2012
Note

QC 20121115

Available from: 2012-11-15 Created: 2012-11-13 Last updated: 2015-02-06Bibliographically approved
2. Partial discharge patterns in a cavity embedded in oil-impregnated papers: Part 1: Effect ofhigh voltage impulses
Open this publication in new window or tab >>Partial discharge patterns in a cavity embedded in oil-impregnated papers: Part 1: Effect ofhigh voltage impulses
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(English)Article in journal (Other academic) Submitted
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-105036 (URN)
Note

QCR 20160615

Available from: 2012-11-15 Created: 2012-11-15 Last updated: 2016-06-15Bibliographically approved
3. Effect of high voltage impulses on partial discharge activity in a cavity embedded in paper insulation
Open this publication in new window or tab >>Effect of high voltage impulses on partial discharge activity in a cavity embedded in paper insulation
Show others...
2012 (English)In: 2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), IEEE , 2012, 133-136 p.Conference paper, Published paper (Refereed)
Abstract [en]

High voltage impulses in electrical power systems are mainly caused by lightning strikes and switching operations. The dielectric properties of a particular insulation at the instant of interaction with a high voltage impulse would determine the level of the degradation of the electrical insulation caused by the high voltage impulse. In this work, the effect of high voltage impulses on the partial discharge (PD) parameters was investigated. The investigation was done in test samples consisting of a cavity deliberately introduced between oil-impregnated papers used in power transformer bushings. The measurement results presented in this paper show that high voltage impulses can have a large impact on the behavior of the PD parameters if the test sample is aged by partial discharges, but a smaller impact when the test sample is unaged.

Place, publisher, year, edition, pages
IEEE, 2012
Series
Conference on Electrical Insulation and Dielectric Phenomena. Annual Report, ISSN 0084-9162
Keyword
Electrical power system, High voltage, Lightning strikes, Measurement results, Oil-impregnated paper, Paper insulation, Partial discharge activity, PD parameters, Switching operations, Test samples, Transformer bushings
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-105037 (URN)10.1109/CEIDP.2012.6378739 (DOI)000316899800028 ()2-s2.0-84872091683 (Scopus ID)978-1-4673-1252-3 (ISBN)
Conference
2012 IEEE Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2012; Montreal, QC; Canada; 14 October 2012 through 17 October 2012
Note

QC 20121115

Available from: 2012-11-15 Created: 2012-11-15 Last updated: 2015-02-06Bibliographically approved
4. Changes in phase resolved partial discharge patterns in a cavity embedded in paper insulation due to AC voltages andhigh voltage impulses
Open this publication in new window or tab >>Changes in phase resolved partial discharge patterns in a cavity embedded in paper insulation due to AC voltages andhigh voltage impulses
2012 (English)In: proceedings 10th NORDAC 2012, 2012, 93-103 p.Conference paper, Published paper (Refereed)
Abstract [en]

Electrical insulation materials such as pressboards, oils and paper are important components inelectrical power equipment. The breakdown of insulation materials will cause severe failure of the equipment. Therefore, it is important to have condition monitoring methods in insulation materials of power equipment. A phase resolved partial discharge (PRPD) measurement is one of them.

In this work, the effect of high voltage impulses on PRPD patterns was investigated in test samples consisted of a cavity deliberately introduced between oil-impregnated paper used in power transformer bushings. In the first study, the test sample was highly stressed by 50 high voltage impulses. In the second study, the test sample was aged at elevated AC voltage during almost 5 hours, but with four high voltage impulses injected at selected times during the experiment. In the third study the test sample was aged by a PD activity at elevated AC voltage up to about 18 hours. The PRPD patterns were periodically recorded by an Insulation Condition Monitoring (ICM) system. In order to investigate how different electrical stresses affect the dielectric properties of the paper insulation, the fourth study about the dielectric spectroscopy (DS) measurements were performed. The results show that high voltage impulses can have a large impact on the behavior of PRPD patterns if the test sample is aged by partial discharges, but a smaller effect when the test sample is unaged.

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-105038 (URN)
Conference
proceedings 10th NORDAC 2012, Espoom Fubdabdm 10-11 Septenber 2012
Note

QC 20121115

Available from: 2012-11-15 Created: 2012-11-15 Last updated: 2014-03-03Bibliographically approved
5. Partial discharge patterns in a cavity embedded in oil-impregnated papers: Part 2: Effect of thermalageing
Open this publication in new window or tab >>Partial discharge patterns in a cavity embedded in oil-impregnated papers: Part 2: Effect of thermalageing
(English)Article in journal (Other academic) Submitted
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-105039 (URN)
Note

QS 2012

Available from: 2012-11-15 Created: 2012-11-15 Last updated: 2015-02-06Bibliographically approved

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