Corona onset as a design optimization criterion for high voltage hardware

Citation
Db. Phillips et al., Corona onset as a design optimization criterion for high voltage hardware, IEEE DIELEC, 7(6), 2000, pp. 744-751
Citations number
34
Categorie Soggetti
Eletrical & Eletronics Engineeing
Journal title
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
ISSN journal
10709878 → ACNP
Volume
7
Issue
6
Year of publication
2000
Pages
744 - 751
Database
ISI
SICI code
1070-9878(200012)7:6<744:COAADO>2.0.ZU;2-J
Abstract
Hardware for use on Hv systems is designed to be corona free. Recent hardwa re design activity has been centered around attempts to increase the corona onset voltage by optimizing the electric field distribution on its surface . Corona onset, however, is not only a function of the surface electric fie ld, but also its rate of decay away from the surface, and the temperature a nd pressure of the gas in which it is immersed. While corona onset is a bet ter criterion, formulas for predicting it have been validated only for simp le geometries. The first goal of this work, then, is to validate corona ons et conditions for more practical electrode geometries, The second goal is t o determine whether the use of corona onset rather than surface electric fi eld as an optimization criterion can result in hardware with a measurably h igher corona onset voltage, To test this idea, two electrodes were designed , one using electric field optimization and the second using corona onset o ptimization, The corona onset voltage of each electrode was then measured a nd the results compared with predicted values. It was found that the measur ed results compared favorably with the predicted values and that the use of corona onset optimization can result in a modest but measurable increase i n corona onset voltage.