Abstract
Theoretical studies revealed that charge leakage through surface conduction should play an important role during the transient relaxation process of surface potential within containers which are partially filled with charged oil. We prepared an test equipment for the measurement of surface conductivity of oil, and conducted an experiment to determine the surface conductivity of kerosene whose bulk conductivity was Ips/m. Results of the measurements say that the surface conductivity should be as small as 1 fS(10-15S) or less. If the surface conductivity of rest kerosene is so small, variation of surface conductivity caused by the electrostatic charging might be taken into account, as is true for the case of exceedingly low bulk conductivity, when we construct theoretical models on the transient relaxation of surface potential.
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