Internal Arc Performance of Instrument Transformers Filled with Different Dielectric Liquids

Ivan Mihoković, Anton Rački, Igor Žiger () and Eduard Plavec
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Ivan Mihoković: Končar—Instrument Transformers Inc., Josipa Mokrovića 10, HR-10090 Zagreb, Croatia
Anton Rački: Končar—Instrument Transformers Inc., Josipa Mokrovića 10, HR-10090 Zagreb, Croatia
Igor Žiger: Končar—Instrument Transformers Inc., Josipa Mokrovića 10, HR-10090 Zagreb, Croatia
Eduard Plavec: Končar—Electrical Engineering Institute Ltd., Fallerovo Šetalište 22, HR-10000 Zagreb, Croatia

Energies, 2024, vol. 17, issue 2, 1-15

Abstract: Internal arc testing is still a controversial topic in the instrument transformer world. The main reason for that is the fact that even a fully successful test guarantees only a certain degree of transformer safety. Furthermore, the test does not cover a plethora of operational fault scenarios and has requirements which are not defined clearly enough. In addition, there are very few data available in the literature on the internal arc performance of alternative, biodegradable dielectric liquids. Some liquids (such as natural and synthetic esters) do inherently come with higher flash and fire points compared to conventional mineral oil, but there is insufficient test experience to corroborate the influence this high fire point has on the actual operation. Specifically, to the authors’ knowledge, internal arc tests on instrument transformers were never performed with biodegradable dielectric liquids, making the contributions of this paper a true world premiere. In short, this paper is intended to augment the existing standards, thus providing additional insight into how to test internal arc performance, what to look out for and what level of performance to expect, which is of broad interest to researchers, utility engineers and public alike.

Keywords: biodegradable dielectric liquids; internal arc testing; arc energy; instrument transformers (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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