Abstract

Recent visual examination of unfilled polyethylene (PE) and cross-linked polyethylene (XLPE) insulation removed from cables which had been in service for a number of years, revealed so-called treeing patterns in some of the examined specimens. <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1,2</sup> Electrical trees, originated by partial discharges, have been observed for a long time in various types of insulation, including PE and XLPE. <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3,4</sup> We have studied electrical treeing effects very broadly, and have come to the conclusion that this effect is considerably different from that causing trees recently observed in cable insulation. <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">5</sup>

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