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Pre-breakdown Characteristics of Contaminated Power Transformer Oil

Pre-breakdown Characteristics of Contaminated Power Transformer Oil
Pre-breakdown Characteristics of Contaminated Power Transformer Oil
In this paper we have studied pre-breakdown characteristics of transformer oil in the presence of different levels of contamination. The contaminant is fibrous dust from pressboard insulation used for high voltage transformers. The contamination level investigated in the present study ranges from 0.0025 to 0.0075% by weight. The conduction current under dc voltages were recorded and bridging effect was monitored using optical images. It has been found that the conduction current typically increases with the applied voltage, the duration of the voltage application and the level of contamination. Optical images revealed that bridging occurs when oil is subjected to the voltage and bridge dimension increases with the contamination level and the duration. The current flowing between the two spherical electrodes is closely related to the bridging dynamics.
Transformer oil, bridging phenomenon, conduction current, pre-breakdown, contamination, insulation
1-4244-1481-4
659-662
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Zuber, H M
56db8e42-ac10-4bb1-a80c-63dc1d902240
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Zuber, H M
56db8e42-ac10-4bb1-a80c-63dc1d902240

Chen, G and Zuber, H M (2007) Pre-breakdown Characteristics of Contaminated Power Transformer Oil. Conference on Electrical Insulation and Dielectric Phenomena, Canada. 14 - 17 Oct 2007. pp. 659-662 .

Record type: Conference or Workshop Item (Paper)

Abstract

In this paper we have studied pre-breakdown characteristics of transformer oil in the presence of different levels of contamination. The contaminant is fibrous dust from pressboard insulation used for high voltage transformers. The contamination level investigated in the present study ranges from 0.0025 to 0.0075% by weight. The conduction current under dc voltages were recorded and bridging effect was monitored using optical images. It has been found that the conduction current typically increases with the applied voltage, the duration of the voltage application and the level of contamination. Optical images revealed that bridging occurs when oil is subjected to the voltage and bridge dimension increases with the contamination level and the duration. The current flowing between the two spherical electrodes is closely related to the bridging dynamics.

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More information

Published date: 2007
Additional Information: Event Dates: October 14 - 17, 2007
Venue - Dates: Conference on Electrical Insulation and Dielectric Phenomena, Canada, 2007-10-14 - 2007-10-17
Keywords: Transformer oil, bridging phenomenon, conduction current, pre-breakdown, contamination, insulation
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 264706
URI: http://eprints.soton.ac.uk/id/eprint/264706
ISBN: 1-4244-1481-4
PURE UUID: 34fb76be-7868-484b-9f46-1090bc7704b8

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Date deposited: 20 Oct 2007
Last modified: 16 Dec 2019 20:42

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Contributors

Author: G Chen
Author: H M Zuber

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