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Energies 2019, 12(3), 554; https://doi.org/10.3390/en12030554

Development Processes of Surface Trucking and Partial Discharge of Pressboards Immersed in Mineral Oil: Effect of Tip Curvatures

School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, China
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Received: 7 January 2019 / Revised: 2 February 2019 / Accepted: 4 February 2019 / Published: 11 February 2019
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

The pressboard surface is the electric weak link of the oil-paper insulation in transformers, and long-term partial discharge (PD) erosion is the dominant cause of degradation in pressboard. To explore the development processes of surface tracking under the effect of tip curvature, the typical needle-plate model was selected to initiate an electric field with a high tangential component on pressboard surface under needle tip curvature of 4~42 μm. With the help of a high-speed camera and a PD detecting system, the development processes of surface tracking and PD were recorded under a sustained AC voltage. A profound difference between surface tracking under different curvatures was discussed. Pressboard surfaces after tests were observed under a scanning electron microscope (SEM), and the damage degree of cellulose fibers was dependent on the tip curvature. View Full-Text
Keywords: surface tracking; PD; mineral oil; needle tip curvature; AC surface tracking; PD; mineral oil; needle tip curvature; AC
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Gao, B.; Yu, R.; Hu, G.; Liu, C.; Zhuang, X.; Zhou, P. Development Processes of Surface Trucking and Partial Discharge of Pressboards Immersed in Mineral Oil: Effect of Tip Curvatures. Energies 2019, 12, 554.

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