Grounded DC tree is a serious threat for the safe operation of XLPE cable. In this paper, growth properties of grounded DC electrical trees in XLPE under ±40kV DC voltage were investigated and analyzed. The results showed that DC voltage polarity had a remarkable impact on the growth characteristics of grounded electrical tree. Sparse-branch and dense-branch electrical trees were more likely to form under positive and negative voltage, respectively. Meanwhile, the time of typical grounded DC tree samples growing to 1mm was also calculated. The results indicated that the average growing time under positive voltage could be a bit shorter than that under negative voltage. The results in this paper can help in the understanding of DC tree mechanism and provide a support for the later experiments.
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Li et al. (2018) studied this question.
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