In order to diagnose the effectiveness of electrical insulation, it is necessary to obtain information regarding the electric field distribution in insulating materials. We have investigated the measurement of electric field vector distributions in liquid dielectrics using an original method. Electric field distributions could be measured in time intervals of milli-seconds by an optical system. In this study, the electric field in a liquid containing space charges was measured, and the change in the electric field caused by the charges in the liquid was examined. Moreover, the space charge distribution in the liquid was also studied. We believe that our study can aid a better understanding of the movement of charges in liquid dielectrics.

It is important to obtain information about electric field and space charge distributions. We have investigated the measurement of electric field vector distributions in liquid dielectrics using an original method. We developed an optical system to measure electric field distributions on the order of milliseconds. Therefore, time series measurement of electric field distributions in a parallel plane electrode system was carried out. From the obtained field distributions, the time variation of a space charge density distribution was obtained. This is the first example in which the space charge distribution was measured at time intervals of 1 ms.

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