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Abstract
The results of experimental investigation have been recorded under the effects various factors which influence the surface flashover strength across perspex (PMMA) and teflon (FEP) insulators in vacuum. The factors studied, for alternating (50 Hz) and direct voltage stresses, include the dependence of flashover voltage on specimen length and uniform and non-uniform field conditions. The influence of the number of sequential flashovers on flashover voltages and on the surface deterioration of polymers samples, in vacuum, has also been determined. Tree tracks are examined under the microscope to determine their growth and characteristics at different stages in the experiment.