Influence of Molecule Structure on Lightning Impulse Breakdown of Ester Liquids

Huaqiang Li, Linfeng Xia, Shengwei Cai, Zhiqiang Huang, Jiaqi Li and Lisheng Zhong
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Huaqiang Li: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Linfeng Xia: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China
Shengwei Cai: State Key Laboratory of Power Grid Environmental Protection, China Electric Power Research Institute Wuhan Branch, Wuhan 430074, China
Zhiqiang Huang: Transformer Division CHINT Electric Co., Ltd., Shanghai 201614, China
Jiaqi Li: Department of Smart Grid Information Engineering, School of Electrical Engineering, Hefei University of Technology, Hefei 230009, China
Lisheng Zhong: State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi’an 710049, China

Energies, 2021, vol. 14, issue 4, 1-15

Abstract: Ester liquids are environmentally friendly insulating oils, and they can be used as an alternative to mineral oil in transformers, even though in most countries spills of ester oils must be treated like spills of mineral oil. Furthermore, the breakdown characteristics of ester liquids are worse than those of mineral oils in heterogeneous electric fields. In this paper, we present a comprehensive experimental research on both positive and negative lightning impulse breakdown properties in point-plane geometries with gaps varying from 1 mm to 50 mm. The breakdown voltages and streamer velocities of five kinds of ester liquids, including natural ester, synthetic ester, and three kinds of single component esters have been measured. The results show that the double bonds have no effect on the breakdown voltage of ester liquids. The average streamer velocities of mono-esters are faster than that of other esters under positive polarity, and the breakdown voltages of all esters are close.

Keywords: streamer; breakdown; ester liquids; natural ester; lightning impulse (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: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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