NDLI: Discharge voltage of dielectric gaps and the generalized secondary ionization coefficient gamma of the dielectric cathode

Content Provider	IEEE Xplore Digital Library
Author	Takahashi, Y. Kato, S. Kobayashi, S.
Copyright Year	1988
Description	Author affiliation: Dept. of Electr. Eng., Tokyo Univ. of Agric. & Technol., Japan (Takahashi, Y.)
Abstract	The coefficient gamma of PMMA (polymethyl methacrylate) is estimated with reference to partial discharges. Partial discharge inception voltage was measured in a system in atmospheric air where a PMMA plate is inserted between a metal sphere and a metal plate. A ramp voltage is applied, and the PMMA plate is the cathode. The point of initial discharge on the plate is detected by a color-powder technique. A field computation gives discharge gap length at the discharge point and voltage across the air gap. When the thickness of the PMMA plate is varied, the discharge point changes, and the discharge gap length and the voltage across the gap change accordingly. Thus, the relation between discharge voltage and air gap length for the PMMA cathode is obtained. The resulting discharge voltage for an air gap length of 0.1-0.4 mm is lower than the Paschen voltage of metal gaps by 20-27%. The coefficient gamma is calculated as 7.810/sup -4/-1.010/sup -1/ for the PMMA cathode. These values are larger than gamma for metal gaps calculated from Paschen voltage.
Starting Page	550
Ending Page	553
File Size	478267
Page Count	4
File Format	PDF
DOI	10.1109/ICPADM.1988.38455
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1988-09-12
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Voltage Ionization Cathodes Partial discharges Partial discharge measurement Powders Atmospheric measurements Dielectric measurements Surface discharges Electric variables measurement
Content Type	Text
Resource Type	Article

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