Dielectric behaviour of natural and synthetic esters at inhomogeneous field conditions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23220%2F20%3A43955983" target="_blank" >RIV/49777513:23220/20:43955983 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21230/20:00345680

Výsledek na webu

<a href="https://link.springer.com/chapter/10.1007%2F978-3-030-31680-8_32" target="_blank" >https://link.springer.com/chapter/10.1007%2F978-3-030-31680-8_32</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/978-3-030-31680-8_32" target="_blank" >10.1007/978-3-030-31680-8_32</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dielectric behaviour of natural and synthetic esters at inhomogeneous field conditions

Popis výsledku v původním jazyce

Natural and synthetic esters will be more and more applied as an alternative fluid to the commonly used mineral oil. The application in electrical apparatus needs, at least, the same withstand ability against electrical breakdown or partial discharge (PD) activities as given by the well-known mineral oil properties. Besides the introduced standardized procedure, the behaviour at inhomogeneous field condition is of special interest for design, manufacturing and quality testing of relevant insulations. The paper deals with some results of breakdown property at lightning impulse voltage as well as PD behaviour at AC stress conditions. To provide inhomogeneous field condition a basic arrangement tip-to-semi-sphere was investigated. At impulse testing the highest break-down values were obtained for synthetic ester at a weak polarity effect. In addition to that an impact of time between successive test impulses (waiting time) could be observed. Especially for shorter values of waiting time (&lt; 300s) a statistical evaluation of the obtained values was impossible because the measured data were not statistically independent. That was probably given by the evidence of espace charges generated by each impulse and should be further investigated. As described in the paper the PD behaviour shows a certain polarity effect for different oil types. If the test voltage will be increased above the PD inception voltage up to the breakdown value also a different PD behaviour was obtained. It should be noticed, that the final discharges which initiate the break-down were always in the range of 5 15 nC at both types of esters. The obtained results may contribute to a deeper understanding of the dielectric behaviour of esters at inhomogeneous field condition. Especially the impact of space charges to the breakdown ability should be further investigated.

Název v anglickém jazyce

Dielectric behaviour of natural and synthetic esters at inhomogeneous field conditions

Popis výsledku anglicky

Natural and synthetic esters will be more and more applied as an alternative fluid to the commonly used mineral oil. The application in electrical apparatus needs, at least, the same withstand ability against electrical breakdown or partial discharge (PD) activities as given by the well-known mineral oil properties. Besides the introduced standardized procedure, the behaviour at inhomogeneous field condition is of special interest for design, manufacturing and quality testing of relevant insulations. The paper deals with some results of breakdown property at lightning impulse voltage as well as PD behaviour at AC stress conditions. To provide inhomogeneous field condition a basic arrangement tip-to-semi-sphere was investigated. At impulse testing the highest break-down values were obtained for synthetic ester at a weak polarity effect. In addition to that an impact of time between successive test impulses (waiting time) could be observed. Especially for shorter values of waiting time (&lt; 300s) a statistical evaluation of the obtained values was impossible because the measured data were not statistically independent. That was probably given by the evidence of espace charges generated by each impulse and should be further investigated. As described in the paper the PD behaviour shows a certain polarity effect for different oil types. If the test voltage will be increased above the PD inception voltage up to the breakdown value also a different PD behaviour was obtained. It should be noticed, that the final discharges which initiate the break-down were always in the range of 5 15 nC at both types of esters. The obtained results may contribute to a deeper understanding of the dielectric behaviour of esters at inhomogeneous field condition. Especially the impact of space charges to the breakdown ability should be further investigated.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of the 21st International Symposium on High Voltage Engineering (Lecture Notes in Electrical Engineering. Vol. 2)

ISBN

978-3-030-31679-2

ISSN

1876-1100

e-ISSN

1876-1119

Počet stran výsledku

12

Strana od-do

308-319

Název nakladatele

Springer Nature

Místo vydání

Cham

Místo konání akce

Budapest, Hungary

Datum konání akce

26. 8. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—