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Broad band pulse detection studies of partial discharges in presence of solid dielectrics

Kulkarni, SV and Nema, RS (1988) Broad band pulse detection studies of partial discharges in presence of solid dielectrics. In: Conference Record of the 1981 IEEE International Symposium on Electrical Insulation, 5-8 June, 1988, Cambridge, MA, USA, pp. 364-367.


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Experiments were conducted to detect partial discharge (PD) pulses in presence of solid dielectrics (PTFE and glass filled epoxy) as well as breakdown pulses in $SF_6$, $N_2$ and $SF_6 -N_2$ mixtures under uniform field conditions using a broad band detection system. The effects of circuit parameters, overvoltages, pressure of the gas and the distance between electrodes on pulse shapes were studied in detail for various mixture proportions of $SF_6$ in $SF_6 - N_2$ mixtures. The observed PD pulses are similar go dose of breakdown pulses for longer electrode gaps (>0.3 cm). In case of surface discharges the pulses are oscillatory in nature and inconsistent in shape and magnitude. The effect of saturation in increase in breakdown voltage of $SF_6 -N_2$ mixtures with increase in percentage of $SF_6$ (i.e, synergism) is also observed in the presence of solid dielectric. This synergistic effect is also reflected in corresponding observed PD pulse shapes.

Item Type: Conference Paper
Publisher: IEEE
Additional Information: ©1988 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Department/Centre: Division of Electrical Sciences > High Voltage Engineering (merged with EE)
Date Deposited: 26 Feb 2008
Last Modified: 19 Sep 2010 04:42
URI: http://eprints.iisc.ac.in/id/eprint/13088

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