Experimental and Theoretical Analysis of Vacuum Circuit Breaker Prestrike Effect on a Transformer

Abstract

Experimental and theoretical analysis of vacuum circuit breaker prestrike effect on a transformerPopov, M.; Smeets, R.P.P.; Sluis, van der, L.; Herdt, de, H.; Declercq, J. Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication Citation for published version (APA):Popov, M., Smeets, R. P. P., Sluis, van der, L., Herdt, de, H., & Declercq, J. (2009). Experimental and theoretical analysis of vacuum circuit breaker prestrike effect on a transformer. IEEE Transactions on Power Delivery, 24(3), 1266-1274. DOI: 10.1109/TPWRD.2009 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. I. INTRODUCTION IT IS well known that during switching highly inductive loads like transformers and motors, under specific conditions, multiple restrikes in the circuit breaker can occur. Multiple restrikes are fast voltage surges which proceed along the cable and reach transformer or motor terminals. Because of different surge impedances at terminals, a wave reflection and absorption takes place. Voltage oscillations which proceed toward windings are continuously superposed by new voltage waves from new upcoming surges. Hence, voltage waveforms along the transformer winding within a particular time interval can have very different amplitude and rate of rise. Their oscillations contain a broad frequency range which can be from a few kilohertz up to a few megahertz. These are unwanted phenomena [15]. This model is based on the measured frequency admittance matrix of the transformer, the elements of which are admittances measured from any provided measuring point in the transformer windings [16]. The advantage o...

Electric stresses on transformer winding insulation under standard and non-standard impulse voltages

“…Popov et al [14] investigated the phenomenon that can produce high overvoltages internally in large shell-type transformer windings. They also investigated the effect of fast voltage transients, which occur due to circuit breaker pre-strike on transformer insulation [2,15,16]. The importance of considering frequency-dependent behavior of transformer during overvoltage analysis has been reported in many studies [17][18][19].…”

Analysis of Switching Effects of Vacuum Circuit Breaker on Dry-Type Foil-Winding Transformers Validated by Experiments

“…In [1], [11], and [12], transformers' transient overvoltages and associated internal voltage propagation are studied by performing measurements and digital simulations. Three types of transformer models could be distinguished for digital simulations; black-box models, transmission-line models, and lumped parameter models.…”

Time domain severity factor (TDSF)

“…In this scenario, fast voltage surges reaching the transformer may match any resonance frequency in some place along windings. The result is a local amplification of voltage, creating an overvoltage at certain points, which can lead to deterioration and failure of its insulation system (Kondala and Gajjar, 2006;Popov and Archa, 1999;Popov et al, 2009Popov et al, , 2001.…”

“…Other papers analyze the behavior of the transformer at terminals during a switching operation in a power system using terminal models obtained from measurements (Kondala and Gajjar, 2006;Popov and Archa, 1999;Popov et al, 2001). In Popov et al (2009), the internal voltage distribution along transformer windings applying switching transient voltages on the transformer terminals obtained from measurements is calculated. However, it is in the previous work (Á lvarez-Mariño and Lopez-Fernandez, 2011), where authors proposed a method capable of both, to obtain the switching waveform at the transformer terminals from terminal model implemented in Electromagnetic Transient Program (EMTP) type and to compute the internal transient voltages along transformer windings caused by opening operation of the VCB.…”

“…On the other hand, the response of the transformer connected to the power system will be different according to the behavior of the circuit breaker (Kondala and Gajjar, 2006;Popov and Archa, 1999;Popov et al, 2009Popov et al, , 2001.…”