Dual-Temperature Evaluation of a High-Temperature Insulation System for Liquid-Immersed Transformer

Xiaojing Zhang, Lu Ren, Haichuan Yu, Yang Xu, Qingquan Lei, Xin Li and Baojia Han
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Xiaojing Zhang: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, No.28 Xianning West Road, Xi’an 710049, China
Lu Ren: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, No.28 Xianning West Road, Xi’an 710049, China
Haichuan Yu: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, No.28 Xianning West Road, Xi’an 710049, China
Yang Xu: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, No.28 Xianning West Road, Xi’an 710049, China
Qingquan Lei: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, No.28 Xianning West Road, Xi’an 710049, China
Xin Li: Electric Power Research Institute of Guangdong Power Grid Corporation, No.6–8 Dongfeng East Road, Guangzhou 510062, China
Baojia Han: Guangdong Zhongpeng Electricity Co., Ltd., No.19 Qianjin Road, Foshan 528000, China

Energies, 2018, vol. 11, issue 8, 1-15

Abstract: A high-temperature oil–paper insulation system offers an opportunity to improve the overloading capability of distribution transformers facing seasonal load variation. A high-temperature electrical insulation system (EIS) was chosen due to thermal calculation based on a typical loading curve on the China Southern Power Grid. In order to evaluate candidate high-temperature insulation systems, Nomex ® T910 (aramid-enhanced cellulose) immersed in FR3 (natural ester) was investigated by a dual-temperature thermal aging test compared with a conventional insulation system, Kraft paper impregnated with mineral oil. Throughout the thermal aging test, mechanical, chemical, and dielectric parameters of both paper and insulating oil were investigated in each aging cycle. The thermal aging results determined that the thermal class of the FR3-T910 insulation system meets the request of overloading transformer needs.

Keywords: liquid-immersed transformer; thermal aging; Nomex T910; natural ester; dual-temperature (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 (4)

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