In the oil-paper-insulation system the static electrification which is caused by the friction between the insulating oil and the solid insulating materials owing to oil flow brings about DC charging potential. Assuming that the positive current which was caused by the charge separation flowed into the insulating oil at the interface between the insulating oil and the solid insulating materials, we developed a calculation method of DC potential distribution which is caused by the static electrification in the oil-paper-insulation system. In order to confirm the appropriateness of the calculation method of DC potential distribution developed in this paper, static electrification tests in large scale models of oil flow were carried out actually. Then, the comparison between the calculation of the potential distribution and the experimental results in the models was carried out by measuring the charging potential of the electrode and the leakage current from the electrode to the ground, and investigating the locations of the occurrence of partial discharges in the models. Consequently, the calculated results of the potential distribution in the models agree well with the experimental results of the static electrification in the models, and it is concluded that the calculation method of the potential distribution is very useful for the clarification of the static electrification phenomena which are caused by oil flow. Copyright © 1979 by The Institute of Electrical and Electronics Engineers, Inc.
