Abstract
To evaluate time variation of hydrophobicity of silicone rubbers used for outdoor polymeric insulators, various kinds of test methods have been suggested. CIGRE WG D1.14 conducted an international Round Robin Test (RRT) to clarify the efficiency and reproducibility of Dynamic Drop Test for the evaluation of hydrophobicity stability of the materials. Three Japanese universities were participated the RRT and had contributed much for the activity. This paper provides the outline of CIGRE RRT and typical experimental results of the Dynamic Drop test.
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