Effect of Thermal Pulse on Space Charge Accumulation in LDPE under DC Voltage

In this paper, new experimental methods are devised to investigate the effects of thermal pulse and DC high voltage on space charge accumulation in LDPE. Studies have shown that after applying a thermal pulse, abundant heterocharge accumulates on the low-temperature side, causing electric field distortion. Accumulated charges and distorted electric fields recover after cooling for a while. And the thicker the LDPE, the faster the heterocharge builds up at cathode. The space charge accumulation phenomena of LDPE under thermal pulse exhibit a different pattern from that under steady-state thermal fields, which is of guidance for the study of the effect of dynamically changing thermal fields on charge transport processes.