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Partial Discharge Analysis at Arbitrary Voltage Waveform Stimulus
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. (High voltage engineering and insulation diagnostics)
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Partial discharge (PD) detection is widely used to diagnose the defects and degradation in an electrical insulation system. Generally, PD are measured with 50 Hz AC sinusoidal voltage in the on-line situation, but can also be detected at other voltage stimulus in some off-line situations. In order to investigate the sequence or repetition rate of discharge pulses over time, Pulse Sequence Analysis (PSA) has een used by acquiring data from a time-resolved measurement system.

The aim of this work is to investigate other kinds of voltage waveform stimulus which can give a better understanding of the partial discharge behavior and a clearer picture of the physical environment around the defect. Therefore, some PD measurements have been performed by applying three types of arbitrary voltage stimulus. Firstly, the internal discharge was carried out in a narrow dielectric gap between spherical electrodes at half-sine pulse voltage of the alternating or unipolar polarity, and then the linearly ramped pulse voltage was applied. Corona discharge was achieved at the periodic negative step voltage in the needle-plane setup with the ground electrode covered with a layer of insulating material. The results show the effect of different voltage stresses on partial discharge characteristics, which could explain the discharge physical process.

A FEM-based numerical model was developed in order to study the in-depth physical process of corona discharge. The model focuses on the decay process of surface charges deposited on the insulation surface after the discharge events. It includes diffusion, bulk and surface conduction processes of surface charge decay. The simulation results have a good agreement with the measurement ones for corona discharge, which indicates the dominant mechanism of surface charge decay at different applied voltage levels.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2012.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-105837ISBN: 978-91-7501-587-3 (print)OAI: oai:DiVA.org:kth-105837DiVA: diva2:572451
Presentation
2012-12-18, H21, Teknikringen 33, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20121128

Available from: 2012-11-28 Created: 2012-11-27 Last updated: 2016-11-24Bibliographically approved
List of papers
1. Partial discharge analysis of a narrow dielectric gap with repetitive half-sine pulses
Open this publication in new window or tab >>Partial discharge analysis of a narrow dielectric gap with repetitive half-sine pulses
2010 (English)In: Annual Report: Conference on Electrical Insulation and Dielectric Phenomena, 2010Conference paper, Published paper (Refereed)
Abstract [en]

Partial Discharge (PD) tests are carried out in a narrow dielectric gap between spherical electrodes at arbitrary voltage stimulus by a time-resolved measurement system. The usual AC voltage sinusoidal waveform application is compared with a new method based on repetitive half-sine voltage pulses, with either alternating or unipolar polarity. The half-sine pulse with duration T1 is followed by a pause period of zero voltage of duration T2 before the reversed polarity half-sine pulse. The effect of the pause period on the discharge activity is investigated. The results are shown for the case of 10 ms duration of the halfsine pulse, i.e. 50 Hz-like, but a pause between every two halfsine pulses can be varied. The PD signals are acquired with a Scope Corder that makes pulse sequential analysis possible. The differences between the two methods and the influence of a pause between two half-sine voltage periods to PD behavior is investigated.

National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-105857 (URN)10.1109/CEIDP.2010.5724053 (DOI)2-s2.0-79952965107 (Scopus ID)
Conference
2010 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2010;West Lafayette, IN;17 October 2010through20 October 2010
Note

QC 20130204

Available from: 2012-11-28 Created: 2012-11-28 Last updated: 2013-02-04Bibliographically approved
2. Partial discharge analysis of a narrow dielectric gap with repetitive linear ramping pulses
Open this publication in new window or tab >>Partial discharge analysis of a narrow dielectric gap with repetitive linear ramping pulses
2011 (English)In: Proc. Nordic Insulation Symposium, 2011, 53-65 p.Conference paper, Published paper (Refereed)
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-105858 (URN)
Conference
Nordic Insulation Symposium (Nord-IS 11), Tampere, Finland
Note

QP 20121128

Available from: 2012-11-28 Created: 2012-11-28 Last updated: 2012-11-28Bibliographically approved
3. Partial discharge analysis in a needle-plane gap with repetitive step voltage
Open this publication in new window or tab >>Partial discharge analysis in a needle-plane gap with repetitive step voltage
2012 (English)In: 2012 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), IEEE , 2012, 92-95 p.Conference paper, Published paper (Refereed)
Abstract [en]

Partial Discharge (PD) tests are carried out in a needle-plane gap where the plane is covered by an insulating material. The partial discharge activity is studied during application of a periodic negative step voltage, whose duration of the voltage period T1 and the pause time T2 between every two consecutive step voltage pulses could be varied separately to influence the decay of deposited surface charges. Compared with the PDs in the needle-plane setup without dielectric, the effect of dielectric placed on the top of ground electrode on the discharge activity is investigated. The results show for the case of the step voltage with the duration of 100 ms and the pause time of 10 s. The PD activity during the first voltage cycle is significantly different from the others. For a lower voltage, the pulse repetition in the virgin curve reaches a saturation level within the charging period; however, for the higher voltages it becomes more linear increasing.

Place, publisher, year, edition, pages
IEEE, 2012
Series
Conference on Electrical Insulation and Dielectric Phenomena. Annual Report, ISSN 0084-9162
Keyword
Needle-plane, Partial discharge activity, Partial discharge analysis, Pulse repetition, Saturation levels, Step voltages, Voltage cycle
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-105859 (URN)10.1109/CEIDP.2012.6378730 (DOI)000316899800019 ()2-s2.0-84872095186 (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 20121128

Available from: 2012-11-28 Created: 2012-11-28 Last updated: 2015-05-18Bibliographically approved
4. Surface charge dynamics studied by the temporal evolution of the corona charging current
Open this publication in new window or tab >>Surface charge dynamics studied by the temporal evolution of the corona charging current
Show others...
2015 (English)In: Journal of Electrostatics, ISSN 0304-3886, E-ISSN 1873-5738, Vol. 76, 222-230 p.Article in journal (Refereed) Published
Keyword
POTENTIAL DECAY; PARTIAL DISCHARGES; INSULATORS; FILMS; POLYETHYLENE; CONDUCTION; INJECTION; RESISTIVITY; DIFFUSION; SPACER
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-105860 (URN)10.1016/j.elstat.2015.05.022 (DOI)000359960000031 ()2-s2.0-84934944474 (Scopus ID)
Note

QS 2012

Available from: 2012-11-28 Created: 2012-11-28 Last updated: 2017-12-07Bibliographically approved

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