Abstract
This paper investigated the motion of a metallic cylinder particle of mm size under uniform {AC} field in three transformer liquids, including a mineral oil, a synthetic ester and a natural ester. The clean transformer liquids were also artificially contaminated by copper particles of \&\#x03BC;m size, and the relationship between the {AC} breakdown strengths and the amount of copper particles was determined. It is found that the breakdown voltages of esters are influenced by metallic particles to a less degree than mineral oil. The slower motion of metallic particles in esters of higher viscosities than mineral oil reduce the chance of breakdown, and this might account for the better performance of esters under {AC} stresses with the existence of metallic particles.
Original language | English |
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Title of host publication | Dielectric Liquids (ICDL), 2011 IEEE International Conference on |
Pages | 1-4 |
Number of pages | 4 |
DOIs | |
Publication status | Published - 2011 |
Keywords
- {AC} breakdown strengh
- {AC} stresses
- conductive particle motion
- Conductive particles
- copper particles
- electric breakdown
- Electrodes
- ester AC breakdown strength
- esters
- higher viscosities
- Liquids
- metallic particles
- mineral oil
- Minerals
- motion
- Oil insulation
- power transformer insulation
- transformer liquids