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Spatio-temporal behaviour of anode spot temperature in vacuum gaps under impulse excitations

Balachandra, TC and Nagabhushana, GR (1995) Spatio-temporal behaviour of anode spot temperature in vacuum gaps under impulse excitations. In: Ninth International Symposium on High Voltage Engineering, 28 Aug.-1 Sept. 1995, Graz, Austria, 2289/1-4.

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In this paper, anode hot spot temperature calculations in vacuum gaps subjected to impulse excitations are presented. The transient thermal diffusion equation governing the heat conduction is solved by a finite difference method. The anode spot is modeled as a cylindrical disc heated uniformly at the center by the electron beam from a discrete cathode emitter. The effects of some parameters like the electrode work function, electric field intensification factor and radius of the spot on the anode spot temperature are discussed. A general method of computing the anode spot temperature for any desired impulse wave shape is outlined. The method being a simple numerical technique, can be used to estimate the size of microparticles originating from thermally unstable regions. The results are presented for a 1 mm plane parallel stainless steel electrode gap for a typical switching impulse waveform (250/2500 μs) for an anode spot of 5 μm diameter

Item Type: Conference Paper
Publisher: Institute of High Voltage Engineering
Additional Information: Copyright of this article belongs to Institute of High Voltage Engineering.
Keywords: anodes;cathodes;electric fields;electron beam effects; finite difference methods;heat conduction;impulse testing; insulation testing;stainless steel;switching;thermal diffusion;vacuum insulation
Department/Centre: Division of Electrical Sciences > High Voltage Engineering (merged with EE)
Date Deposited: 07 Sep 2007
Last Modified: 03 Jul 2020 05:17
URI: http://eprints.iisc.ac.in/id/eprint/10831

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