Discharge Onset Voltage Prediction for a Gas-Insulated System Via the Figure-of-Merit Concept

Abstract

The accuracy of discharge onset prediction via the figureof-merit concept for a strongly electronegative gas is examined. A coaxial system is employed, for which the inner electrode possesses a surface roughness of Ra=35 pm. With SF6 as the insulating medium a reference discharge-onset characteristic is obtained for gas pressures up to 0.8 MPa. From a knowledge of this onset characteristic, the direct calculation of discharge onset voltages in other strongly electronegative gases is undertaken by utilizing the figureof-merit concept.For gas pressures in the range O.02<p<0.8 MPa, the voltage values predicted are found to concur with the experimentally determined data.

An experimental method to determine the electrostatic field enhancement factor of a practical conductor surface

“…However the major advantage of the coaxial geometry would be lost, namely the large surface area associated with E,. This In the present study, the rough surfaces which have been analysed were produced by a turning process which provided a regular ridged surface [15]. As the macroscopic radius of each inner electrode was 11 mm, the associated microscopic geometry was essentially two dimensional; i .…”

“…N a parallel study of the insulating characteristics I of different strongly electronegative gases, discharge onset voltages for SFs are reported [14,15]. These measurements, which were obtained for a rough surface environment, will now be analyzed in the light of the present theory.…”

On the electrical breakdown of gaseous dielectrics-an engineering approach

“…If the discharge characteristic for the system in question is known, then this technique allows the direct assessment of a possible replacement gas to be made based solely on this characteristic and the M a n d (E/p)lim data of the two gases [58]. EtE(Eo.…”