Comparative study of dielectric properties of mineral oil, synthetic ester and natural ester

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26220%2F22%3APU147841" target="_blank" >RIV/00216305:26220/22:PU147841 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Comparative study of dielectric properties of mineral oil, synthetic ester and natural ester

Original language description

The current research of insulating oils for high-voltage applications focuses mainly on biodegradable oils that are in line with sustainable development. Mineral oils may in the future be replaced by more environmentally friendly materials with similar properties. One of the probable options as substitutes in the future will be synthetic or natural esters. This paper presents a comparative experimental study of mineral oil, natural ester, and synthetic ester and their dielectric properties, specifically AC breakdown voltage, lightning breakdown voltage, and thermal dependence of dissipation factor, volume resistivity, and relative permittivity. Measurements of AC and lightning breakdown voltage were performed according to IEC 60156 with a horizontally positioned sphere–sphere electrode system. Synthetic ester reached the mean value of AC breakdown voltage 60.2 kV, lightning breakdown voltage with positive polarity 144.3 kV, and with negative polarity 148.6 kV. Natural ester showed a mean value of AC breakdown voltage 58.4 kV, the lightning breakdown voltage of positive and negative polarity was 149.5 kV and 151.5 kV, respectively. Measurement of dissipation factor, volume resistivity, and relative permittivity was executed in accordance with IEC 60247 2004. The dissipation factor moved from 0.0031 at 20°C to 0.3119 at 140°C for synthetic ester and from 0.0011 at 20°C to 0.0331 at 140°C for natural ester. These results are compared with the dielectric properties of mineral oil. The challenging problem of potential oil substitution in power transformers is discussed.

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

<a href="/en/project/LM2015092" target="_blank" >LM2015092: CVVOZE Power Laboratories</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Publication year

2022

Confidentiality

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

Article name in the collection

ELEKTROENERGETIKA 2022: Proceedings of the 11th International Scientific Symposium on Electrical Power Engineering

ISBN

9788055341040

ISSN

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e-ISSN

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Number of pages

5

Pages from-to

241-245

Publisher name

Technical University of Kosice

Place of publication

neuveden

Event location

Stará Lesná

Event date

Sep 12, 2022

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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