抄録
For electrical insulation diagnosis, it is necessary to obtain information about the electric field distribution and the space charge distribution in insulation materials. We have investigated the measurement of nonuniform electric field vector distributions in liquid dielectrics using an original method based on electrooptic Kerr effect and CT method. We developed a optical system that could measure electric field distributions in about 1 ms. In this study, when the DC voltage pulse of 50 ms width was applied to a sphere-to-plane electrode system, electric field vector distributions on some measured planes were measured at intervals of 1 ms. The distribution after a while from applying the voltage pulse seemed to be disturbed. It was considered that the “disturbance” was caused by the change of the density of the liquid due to moving of the liquid with certain carriers. The observation of the time that started the disturbance would be able to give the behaviour and electric characteristic of the liquid.
