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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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Official URL: http://en.scientificcommons.org/57611313

Abstract

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
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: 10 Jan 2012 08:50
URI: http://eprints.iisc.ernet.in/id/eprint/10831

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