Abstract
Electrical aging of polyethylene was inhibited effectively by incorporation of a free radical scavenger (FRS). Samples of polyethylene with and without the FRS were electrically aged for various times and then the space charge distributions of these samples under dc stress and short-circuited were measured, respectively. It is shown that during electrical aging, the space charge distribution of all samples changed in a complex manner, and splitting or superposing of positive or negative charge peaks occurred at the same time. In addition, the total amount of space charge linearly increased with aging time, which corresponds to the remnant breakdown strength of the samples. Considering to the degradation of polyethylene under other types of stresses, the effects of the FRS of reducing the production of space charge and inhibiting electrical aging in polyethylene were discussed. Finally, the feasibility of space charge as a parameter in quantifying electrical aging of polyethylene was discussed.
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