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 most countries spills of ester oils must treated like oil. Furthermore, the breakdown characteristics worse than those heterogeneous electric fields. In this paper, we present a comprehensive experimental research on both positive negative lightning impulse properties point-plane geometries with gaps varying from 1 mm 50 mm. The voltages streamer velocities five kinds liquids, including natural ester, synthetic three single component esters have been measured. results show that double bonds no effect voltage liquids. average mono-esters faster other under polarity, all close.