Abstract
Many tracking resistance tests of synthetic resin have hitherto been proposed, but no satisfactory test method has been derived because of the complication of tracking phenomena. In this paper, a new tracking resistance test was tried under the adequate consideration of various previous tests. In the test, commercial frequency A.C. voltage was applied between two electrodes with the maximum secondary voltage in high voltage transformer being 15kV and the capacity of transformer 1.5kVA. The progress of carbonized track from only one electrode was taken into consideration and the other electrode was floated. Under this electrode arrangement, the variation of length of track was measured by changing the applied voltage, the electrode gap length, etc. Test samples wetted thinly and uniformly with the mixture of 0.1% NH4Cl solution and 0.5% sodium dodecinyle benzen sulphonate solution were used. The length of carbonized track in the experiment was examined from the view point of tracking resistance. The results agreed reasonably well with those by the previous tracking test methods, confirming the applicability of the present method.
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