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Influence of ZnO And Al2O3 nanofillers on electrical treeing in XLPE insulation

Currently, XLPE is widely used in underground high voltage cable. Recently, a few nanofillers have been selected by numerous researchers to enhance the electrical tree resistance in polymer matrix. In this paper, the influence of ZnO and Al2O3 nanofillers on the electrical treeing in XLPE have been investigated. The concentration of nanofillers loading are varies from 0.5 wt%, 1 wt% and 1.5 wt%. The needle-plane electrodes are used in this investigation and the gap between the electrodes is 2 mm. The structure and growth of electrical tree in XLPE containing the nanofillers are observed by using a digital camera and microscope system. The results show that the XLPE containing 1wt% Al2O3 has higher tree inception voltage (TIV) compared with XLPE containing ZnO nanofiller. The propagation length of tree growth of Al2O3 also show an improvement compared to the ZnO nanocomposite.