Breakdown behaviour of oil-barrier insulation at lightning impulse voltage

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21230%2F20%3A00345599" target="_blank" >RIV/68407700:21230/20:00345599 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1109/EPE51172.2020.9269223" target="_blank" >https://doi.org/10.1109/EPE51172.2020.9269223</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1109/EPE51172.2020.9269223" target="_blank" >10.1109/EPE51172.2020.9269223</a>

Result language

angličtina

Original language name

Breakdown behaviour of oil-barrier insulation at lightning impulse voltage

Original language description

The paper deals with some results of breakdown behavior of oil-barrier insulation at inhomogeneous field under lightning impulse voltage stress conditions. The investigation was performed with various types of mineral oil as well as natural and synthetic esters. To provide inhomogeneous field conditions a test arrangement tip-to-semi-sphere was used. For having some reference values also the same test set without barrier (pure oil) was investigated. Additionally, some tests were carried out at standardized conditions (homogeneous field). For generalizing of measured voltage values the electrical breakdown field strength was evaluated. At pure oil test set (reference values) the known polarity effect was measured, what means, that at positive polarity (tip) the breakdown values are significantly lower than at negative one. That was valid for all tested oil types excluding the synthetic ester (FR 3), at which an opposite result was obtained. With pressboard insulation the charging effect of the barrier leads to significant higher electrical breakdown field strength, dependent on used fluid. When the barrier insulation was tested with mineral oil NYTRO BIO, the highest breakdown field strength of ~ 300 kV/mm was obtained (negative polarity). The measured polarity effect for the tested fluids was not so unambiguously as for reference values e.g. so for NYNAS TAURUS, LYRA and FR 3 lower breakdown values have been measured at negative polarity. Also the impact of surface charge on the barrier to the breakdown process was studied by simulation and measurement. Generally, the surface charge on barrier increase the resulting electrical field strength and leads in the insulating gap between barrier and semi- sphere to a (quasi) homogeneous field. The obtained results may contribute to a deeper understanding of the breakdown behavior of oil-barrier insulation at different oil/fluid types and inhomogeneous field condition.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20201 - Electrical and electronic engineering

Project

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Continuities

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

2020 21st International Scientific Conference on Electric Power Engineering (EPE)

ISBN

978-1-7281-9479-0

ISSN

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e-ISSN

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Number of pages

6

Pages from-to

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Publisher name

Czechoslovakia Section IEEE

Place of publication

Prague

Event location

Prague

Event date

Oct 19, 2020

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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