Abstract
Breakdown phenomena of insulating materials have been studied by many investigators. In a previous paper, thermally stimulated current of an LDPE film under non-uniform electric field was measured by using the needle-plane electrode system. Then, we analyzed the space charge characteristics of the film.
In the present paper, thermally stimulated surface potential built up in an LDPE film under non-uniform electric field was measured using the same needle-plane electrode system as in the previous paper. Then we estimated both the range, wherein the space charge field is formed, and the electric field formed at the tip of needle electrode by the space charge. Finally, we concluded from the theoretical analysis that we can obtain the space charge characteristics of insulating materials, e. g. space charge field, by using the experimental results of TSSP measurement and that of TSC measurement.
