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Non-uniform field breakdown of $SF_6$ insulation under combined DC and switching impulse voltages

Venkatesh, SK and Paramesha, ST and Bhat, D and Nema, RS and Naidu, MS (1993) Non-uniform field breakdown of $SF_6$ insulation under combined DC and switching impulse voltages. In: INSULEC - 93. 4th International Seminar on Electrical and Electronic Insulating Materials and Systems, 15-16 Jan. 1993, New Delhi, India, IV/61-6.

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Abstract

A number of rod-plane gaps in $SF_6$ gas prestressed by DC voltages have been tested under positive switching impulse voltages and the effect of the composite stresses on the breakdown probability distribution have been investigated. Experiments were carried out using positive switching impulse voltages superimposed on positive and negative DC voltages at a constant gap separation of 25 mm over the pressure range of 0.1 to 0.5 MPa (absolute) with the degree of field nonuniformity being varied systematically using various rod diameters, i.e. a sharp point, 1.59 mm, 3 mm, 6 mm and 12 mm and a plane electrode 210 mm in diameter. The results clearly show that the DC pre-stressing of the nonuniform field gap considerably alters the breakdown probabilities as well as corona stabilization and breakdown voltages. The results are presented and discussed in the paper

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to IEEMA.
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 08 Jan 2008
Last Modified: 12 Jan 2012 05:37
URI: http://eprints.iisc.ernet.in/id/eprint/11092

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