Electrooptical measurement of electric field in a dielectric liquid containing remanent charges

This It is necessary for electrical insulation diagnosis to obtain information about the electric field 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 of the order of a mili-second. In this study, we carried out the electric field in a liquid containing space charge. The change of the optical light intensity was measured when the voltage pulse was applied again after Ts (min.) from first sequence of applied voltage. i.e., by Ts, the amount of charge in liquid was changed. It was well known that the electric field strength in liquid containing charges was not a static field. The change of the electric field caused by charges in liquid was very interesiting. This technique might be help to know the movement of the charge in a liquid.