Abstract
Is this paper, the fundamental properties of trees at the surface of synthetic resins during application of intermittent high voltage at commercial frequency were investigated. The growth of trees at the surface of various insulating materials was also discussed from a view point of utilizing it as a way to evaluate tracking resistance of materials.The growth of trees occured during the voltage application was large in PVC resin, medium in Polyester glass etc. and small in Silicone glass. In every resin, the growth of trees increased abruptly at the initial period of voltage application, and then slowed down with time.The growth of trees also increased with applied voltage in a manner of a concave curve rising upward, for all resins. The same trend was observed when the electrode gap length was increased.When a high frequency voltage was superimposed, the growth of trees showed a tendency of increasing with superimposed frequency and the effect of accelerating deterioration was observed. However, this effect varied more or less with the kind of resin used.The variation in growth of trees agreed fairly well with the results obtained by the conventional tracking resistance tests.
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