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Project: 129 #T240

A study was carried out on the subject of short-time breakdown characteristics, with particular reference to the influence of an insulating spacer on the V-t characteristics of a coaxial- cylinder gap. A semi-empirical model was developed, allowing an adequate evaluation of the V-t curves of coaxialrcylinder gaps. The typical performance of 550- and 800-kV compressed-gas-insulated buses was also evaluated.