Experimental Study on Breakdown Characteristics of Transformer Oil Influenced by Bubbles

Chunxu Qin, Yan He, Bing Shi, Tao Zhao, Fangcheng Lv and Xiangrui Cheng
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Chunxu Qin: School of Electrical Engineering, Northeast Electric Power University, No. 169 Changchun Road, Jilin 132012, China
Yan He: School of Electrical Engineering, Northeast Electric Power University, No. 169 Changchun Road, Jilin 132012, China
Bing Shi: School of Electrical Engineering, Northeast Electric Power University, No. 169 Changchun Road, Jilin 132012, China
Tao Zhao: Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, No. 619 North of Yonghua Street, Baoding 071003, China
Fangcheng Lv: Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, No. 619 North of Yonghua Street, Baoding 071003, China
Xiangrui Cheng: Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, No. 619 North of Yonghua Street, Baoding 071003, China

Energies, 2018, vol. 11, issue 3, 1-11

Abstract: Bubbles will reduce the electric strength of transformer oil, and even result in the breakdown of the insulation. This paper has studied the breakdown voltages of transformer oil and oil-impregnated pressboard under alternating current (AC) and direct current (DC) voltages. In this paper, three types of electrodes were applied: cylinder-plan electrodes, sphere-plan electrodes, and cone-plan electrodes, and the breakdown voltages were measured in both no bubbles and bubbles. The sphere-sphere electrodes were used to study the breakdown voltage of the oil-impregnated pressboard. The results showed that under the influence of bubble, the breakdown voltage of the cylinder-plan electrode dropped the most, and the breakdown voltage of the cone-plan electrode dropped the least. The bubbles motion was the key factor of the breakdown. The discharge types of the oil-impregnated pressboard were different with bubbles, and under DC, the main discharge type was flashover along the oil-impregnated pressboard, while under AC, the main discharge type was breakdown through the oil-impregnated pressboard.

Keywords: breakdown voltage; transformer oil; pressboard; bubbles; AC; DC (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: 2018
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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