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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