Effect of Nano Al 2 O 3 Doping on Thermal Aging Properties of Oil-Paper Insulation

Ningchuan Liang, Ruijin Liao, Min Xiang, Yang Mo and Yuan Yuan
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Ningchuan Liang: State Key Laboratory of Power Transmission Equipments & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China
Ruijin Liao: State Key Laboratory of Power Transmission Equipments & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China
Min Xiang: State Key Laboratory of Power Transmission Equipments & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China
Yang Mo: State Key Laboratory of Power Transmission Equipments & System Security and New Technology, School of Electrical Engineering, Chongqing University, Chongqing 400044, China
Yuan Yuan: College of Material Science and Engineering, Chongqing University, Chongqing 400044, China

Energies, 2018, vol. 11, issue 5, 1-12

Abstract: The thermal aging property of oil-paper insulation is a key factor affecting the service life of transformers. In this study, nano-Al 2 O 3 was added to insulating paper to improve its anti-thermal aging property and delay the aging rate of the insulating oil. The composite paper containing 2% nano-Al 2 O 3 had the highest tensile strength and therefore was selected for the thermal aging test. The composite and normal papers were treated with an accelerated thermal aging experiment at the temperature of 130 °C for 56 days. The variations of the degree of polymerization (DP) and tensile strength of the insulating papers with aging time were obtained. The characteristics of the insulating oil, including color, acid content, breakdown voltage, and dielectric loss were analyzed. The results revealed that compared with a plain paper, the composite paper maintained a higher DP, and its tensile strength decreased more slowly during the aging process. The oil-impregnated composite paper presented a lighter-colored oil, less viscosity changes, and a considerably lower quantity of thermal aging products. In addition, nano-Al 2 O 3 can effectively adsorb copper compounds and keep part of the acid products and water away from the thermal aging process. This characteristic restrained the catalysis of copper compounds and H + in the thermal aging reaction and reduced the thermal aging speed of both the insulating paper and the insulating oil.

Keywords: nano-Al 2 O 3; thermal aging; copper compound; small molecule acid; catalytic action (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 references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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