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Breakdown behaviour of spark-gaps in $SF_6$ gas with non-uniform fields at bias voltages

Punekar, GS and Naidu, MS (1993) Breakdown behaviour of spark-gaps in $SF_6$ gas with non-uniform fields at bias voltages. In: INSULEC - 93. 4th International Seminar on Electrical and Electronic Insulating Materials and Systems, 15-16 Jan. 1993, New Delhi, India, IV/46-50.

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Studies using composite voltage stresses, in particular, the impulse voltage superimposed on DC, can be a sound method of investigating the anomalous behaviour of the breakdown voltage-pressure characteristics of electronegative gases, such as $SF_6$. Further, such studies will help for a better understanding of the importance of corona stabilization in the breakdown of $SF_6$ under such stresses. This paper examines the breakdown behaviour of nonuniform field gaps in $SF_6$ gas at pressures varying from 0.1 to 0.52 MPa (absolute). The results clearly demonstrate the decisive role played by the pre-discharges in the breakdown process. Also the influence of DC bias voltages on the total breakdown voltage has been discussed. The results of the composite voltage study using a rod (2.17 mm diameter)-plane geometry at a pressure of 0.2 MPa clearly show that the bias voltages, which result in polarity reversal, are the most critical voltage stresses from the point of view of corona preceeded breakdown

Item Type: Conference Paper
Publisher: IEEMA
Additional Information: Copyright of this article belongs to IEEMA.
Department/Centre: Division of Electrical Sciences > High Voltage Engineering (merged with EE)
Date Deposited: 08 Jan 2008
Last Modified: 12 Jan 2012 05:29
URI: http://eprints.iisc.ac.in/id/eprint/11091

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