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Pre-breakdown Characteristics of Contaminated Power Transformer Oil

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

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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.

Creators:G Chen, H M Zuber
Item Type:Conference or Workshop Item
Keywords:Transformer oil, bridging phenomenon, conduction current, pre-breakdown, contamination, insulation
Research Group:Electrical Power Engineering
Electrical Power Engineering > High Voltage Laboratory
Deposited On:20 Oct 2007 by Chen, George
ISBN:1-4244-1481-4
ID Code:14706
Last Modified:18 Feb 2010 15:51
Performance Indicator:EZ~02~02~04
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References in Article

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[1] H. I. Inyang and L. Kaanagbara, “Estimation of electric transformer service life from oil degradation kinetics”, J. Energy Eng. pp. 19 –25, 2007.

[2] T. O. Rouse, “Mineral Insulating Oil in Transformers”, IEEE Electrical Insulation Magazine, Vol. 14, pp. 6-16. 1998.

[3] B. Garcia, J. C. Burgos, A. M. Alonso and J. Sanz, “A Moisture-in-Oil Model for Power Transformer Monitoring—Part I: Theoretical Foundation”, IEEE Transaction on Power Delivery, Vol. 20, pp. 1417-1422, 2005.

[4] M. Ossowski, J.Gielniak, H. Moronda and H. Moscicka-Grzesiak, “Oil resistance at different phases of bridge mechanism development at direct voltage” XIII International Symposium on High Voltage Engineering Netherlands, 2003.

[5] H. Moranda, K. Walczak, H. M. Grzesiak, “Dynamics of bridge creating in contaminated oil at AC voltage and analysis of accompanying partial discharges”, XIII International Symposium on High Voltage Engineering Netherlands, 2003.

[6] M. C. Dankas, “Breakdown of transformer oil” IEEE Elec. Insul. Magazine, Vol. 6, pp. 27 – 34, 1990.

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