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Insulation of 3.3 kV and 6.6 kV XLPE and PE cables was found to be mechanically stressed by 20 to 100 kg/cm2during the process of water tree formation. Infrared absorption curves change if water trees are created. A mechanism of the generation of water trees is discussed in detail. Critical values to judge the level of insulation quality are recommended as 0.01 ω. F for electrical resistance and 5% for tan δ. A lifetime curve is presented to estimate remaining lifetime of cables with water trees.
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Tanaka et al. (1976) studied this question.
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