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Polarity effects on breakdown of short gaps in a point-plane topology in air.
- Source :
-
IEEE Transactions on Dielectrics & Electrical Insulation . Aug2015, Vol. 22 Issue 4, p1815-1822. 8p. - Publication Year :
- 2015
-
Abstract
- Electrical breakdown in air in a point-plane topology involves complex processes that are still not fully understood. Unlike uniform-field topologies, the highly-divergent fields produced by point-plane topologies create pre-breakdown corona with volumetric space charge. It is known that space charges developed by corona discharge have significant impacts on the breakdown voltage in non-uniform electrode topologies. With large inter-electrode gaps (>cm) the breakdown voltage for a HV point cathode in air at atmospheric pressure is noticeably larger than a HV point anode. However, this paper shows that in shorter point-plane gaps in air (less than ~10 mm), in the air pressure range 0.1-0.35 MPa, an HV point anode has a similar breakdown voltage which eventually is surpassed by the HV point cathode as the inter-electrode gap is increased. The inter-electrode gap at which the HV cathode has a higher hold-off voltage is found to be dependent on the gas pressure and radius of the point electrode. [ABSTRACT FROM PUBLISHER]
- Subjects :
- *TOPOLOGY
*ELECTRODES
*ANODES
*PRESSURE
*DIVERGENT series
Subjects
Details
- Language :
- English
- ISSN :
- 10709878
- Volume :
- 22
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Dielectrics & Electrical Insulation
- Publication Type :
- Academic Journal
- Accession number :
- 108932810
- Full Text :
- https://doi.org/10.1109/TDEI.2015.005029