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Space charge characteristics of natural ester oil-impregnated paper with different moisture contents

Space charge characteristics of natural ester oil-impregnated paper with different moisture contents
Space charge characteristics of natural ester oil-impregnated paper with different moisture contents

Mineral oil is the most common dielectric liquid for HVDC converter transformers. However, natural ester oil receives much attention as an alternative dielectric liquid due to its environmental friendliness and low fire risk. Moisture is one of the most dangerous substances, which accelerates the degradation of oil-paper insulation systems. Thus, this paper investigates the impact of moisture on space charge characteristics of the natural ester oil-impregnated paper by comparing it with the mineral oil-impregnated paper. Space charge accumulation is a typical phenomenon under dc conditions, and its presence can lead to electric field distortion and accelerate insulation ageing. The space charge profiles in oil-impregnated papers with different moisture contents are obtained by the pulsed electroacoustic (PEA) method. It has been found that the hydrophilic characteristic of natural ester oil leads to a slow process of forming heterocharges in the natural ester oil-impregnated paper. On the other hand, the hydrophobic characteristic of mineral oil results in faster heterocharge formation in the mineral oil-impregnated paper.

cellulose, mineral oil, moisture, natural ester oil, space charge, HVDC transmission, Oils, Moisture, Conductivity, Oil insulation, Minerals, pulsed electroacoustic method (PEA), Power transformer insulation
1
Yoon, Hyungjin
06d84948-6227-4c3f-bafb-8709a5b7536f
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Yoon, Hyungjin
06d84948-6227-4c3f-bafb-8709a5b7536f
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819

Yoon, Hyungjin and Chen, George (2022) Space charge characteristics of natural ester oil-impregnated paper with different moisture contents. IEEE Transaction on Dielectrics and Electrical Insulation, 1. (doi:10.1109/TDEI.2022.3202740).

Record type: Article

Abstract

Mineral oil is the most common dielectric liquid for HVDC converter transformers. However, natural ester oil receives much attention as an alternative dielectric liquid due to its environmental friendliness and low fire risk. Moisture is one of the most dangerous substances, which accelerates the degradation of oil-paper insulation systems. Thus, this paper investigates the impact of moisture on space charge characteristics of the natural ester oil-impregnated paper by comparing it with the mineral oil-impregnated paper. Space charge accumulation is a typical phenomenon under dc conditions, and its presence can lead to electric field distortion and accelerate insulation ageing. The space charge profiles in oil-impregnated papers with different moisture contents are obtained by the pulsed electroacoustic (PEA) method. It has been found that the hydrophilic characteristic of natural ester oil leads to a slow process of forming heterocharges in the natural ester oil-impregnated paper. On the other hand, the hydrophobic characteristic of mineral oil results in faster heterocharge formation in the mineral oil-impregnated paper.

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Accepted version - IEEE_TDEI_Hyungjin Yoon and George Chen_15_Jun_2022 - Accepted Manuscript
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More information

Accepted/In Press date: 2022
e-pub ahead of print date: 30 August 2022
Additional Information: Publisher Copyright: IEEE
Keywords: cellulose, mineral oil, moisture, natural ester oil, space charge, HVDC transmission, Oils, Moisture, Conductivity, Oil insulation, Minerals, pulsed electroacoustic method (PEA), Power transformer insulation
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Identifiers

Local EPrints ID: 470323
URI: http://eprints.soton.ac.uk/id/eprint/470323
DOI: doi:10.1109/TDEI.2022.3202740
PURE UUID: c2344892-0a3f-497a-9fc8-c59baf40f310
ORCID for Hyungjin Yoon: ORCID iD orcid.org/0000-0002-6097-8487

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Date deposited: 06 Oct 2022 16:50
Last modified: 17 Mar 2024 03:56

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Author: Hyungjin Yoon ORCID iD
Author: George Chen

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