Abstract

As the preliminary stage for standardization of an acceleration test method for composite insulators, change with time of droplet size distribution and that of fog density in a small and a big fog chambers were investigated using two kinds of nozzles and a humidifier. The droplet size distribution and fog density depend on the fog generation method. The observed change of fog conditions with time is found very small, but a confirmation test may be required to check the effect on the electrical properties of composite insulators during acceleration tests.

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