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Energies 2018, 11(3), 634;

Experimental Study on Breakdown Characteristics of Transformer Oil Influenced by Bubbles

School of Electrical Engineering, Northeast Electric Power University, No. 169 Changchun Road, Jilin 132012, China
Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense, North China Electric Power University, No. 619 North of Yonghua Street, Baoding 071003, China
Author to whom correspondence should be addressed.
Received: 30 January 2018 / Revised: 7 March 2018 / Accepted: 9 March 2018 / Published: 13 March 2018
(This article belongs to the Special Issue Engineering Dielectric Liquid Applications)
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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. View Full-Text
Keywords: breakdown voltage; transformer oil; pressboard; bubbles; AC; DC breakdown voltage; transformer oil; pressboard; bubbles; AC; DC

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Qin, C.; He, Y.; Shi, B.; Zhao, T.; Lv, F.; Cheng, X. Experimental Study on Breakdown Characteristics of Transformer Oil Influenced by Bubbles. Energies 2018, 11, 634.

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