Abstract
Defects in the insulation layer of cross-linked polyethylene (XLPE) cable are the leading cause of electrical tree. The mechanism that how the different insulation defects influence on the starting of electrical tree should be explored, and it will be utilized to improve cable insulation in the production and installation. In the paper, firstly the spike-air gap defect as the main defect characteristics of cable fault has been determined by analyzing the actual cable defect type and influence. Then, the needle-electrode short cable test system was built and the representative defect model was constructed, in order to simulate the influence of the spike-air gap defect of different sizes in the outer semiconductor layer on the initial voltage of electrical tree. Thirdly, the Physical model was created to analyze the influence of each defect parameters. The research showed that the electrical tree of XLPE cable was mainly caused by defects in the semiconductor layer. The maximum electric field distribution can be formulized by the maximum field strength Mason model. According to the formulation and the test results, the main parameters, including the spur curvature, the micro-pore pressure and the initial energy of generating electric tree, have a positive promotion on the initial voltage of the electrical tree and can hinder the tree developing. Therefore, utilizing the interface treatment method between the insulation layer and the semiconductor layer, the insulation heat treatment process and the filling of the inert gas are to improve the parameters and further resist electrical tree aging in the production and installation.
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Funding was provided by National Natural Science Foundation of China (Grant number 51777018).
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Qi, F., Wan, D., OuYang, X. et al. Influence of Different XLPE Cable Defects on the Initiation of Electric Trees. J. Electr. Eng. Technol. 14, 2625–2632 (2019). https://doi.org/10.1007/s42835-019-00296-6
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DOI: https://doi.org/10.1007/s42835-019-00296-6