Abstract
With the increasing uses of electric and electronic devices in space and nuclear power stations, those organic insulation materials are inevitably exposed to various kinds of environments. Accordingly, it becomes necessary to investigate the influence of the pressure and radiation on insulation materials. The total dose of gamma-ray irradiation effects on the erosion depth and discharge quantity have been studied. The experiment was carried out by DC impulse voltage under reduced pressure. Polybutylene naphthalate, which was irradiated in air up to 100 kGy and 1 MGy with dose rate of 10 kGy/h using a 60Co gamma-source, has been used as the test sample. The changes of erosion depth and discharge quantity are discussed with decreasing the atmospheric pressure in the range from 100 kPa to 0 kPa and the frequency of applied impulse voltage in the range from 100 Hz to 200 Hz. It is found that the both of the erosion depth and discharge quantity decreased with increasing the total dose of gamma-ray irradiation and decreasing the atmospheric pressure, and increased with increasing the frequency of applied impulse voltage.
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