Influence of Molecule Structure on Lightning Impulse Breakdown of Ester Liquids

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...

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Bibliographic Details
Published in:Energies (Basel) 2021-02, Vol.14 (4), p.1061
Main Authors: Li, Huaqiang, Xia, Linfeng, Cai, Shengwei, Huang, Zhiqiang, Li, Jiaqi, Zhong, Lisheng
Format: Article
Language:English
Subjects:
Breakdown
Carbon
Chemical spills
Electric fields
Electrodes
ester liquids
Esters
Experimental research
Glycerol
Hydrocarbons
Lightning
lightning impulse
Liquids
Mineral oils
Molecular structure
natural ester
Phase transitions
Polarity
Spills
streamer
Velocity
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Summary: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.
ISSN:1996-1073
1996-1073
DOI:10.3390/en14041061