DC short-circuit treeing phenomena in EPR at cryogenic temperature

摘要

(1) The short-circuit tree length at negative voltage is longer than that at positive because injection of negative space charge is easier than positive.rn(2) At cryogenic temperature, space charge injection is less than that at room temperature and diffusion of space charge is limited. For dc electrical insulation, space charge is less problematic at cryogenic temperature than at room temperature.