Abstract
The effects of direct current pre-stress on impulse electric strength Fb of oxidized polyethylene were investigated. For the sample oxidized for 50 h (heavy oxidation), Fb decreased with pre-stress field with both the same and opposite polarity to the subsequent impulse. These results were interpreted in terms of either deep penetration of home space charge injected from an electrode or thermal breakdown due to the large current increase caused by heavy oxidation. For oxidation time 25 h, Fb increased and decreased with field aiding and opposing pre-stress, respectively. The space-charge profile was also observed by the laser induced pressure pulse method. The relation between the pre-stress effect and the space charge distribution can be quantitatively explained in terms of the electric field distortion due to the effect of home space charge formed during the pre-stress. The effects of pre-stress time and rest time following application of pre-stress on Fb were also investigated.
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