Abstract
AbstractElectrical insulation diagnosis requires that we obtain information about the electric field distribution and the space charge distribution in insulating materials. We have measured nonuniform electric field vector distributions in liquid dielectrics by our original method based on the electrooptic Kerr effect and the CT method. We carried out time sequence measurement of the electric field vector distribution in propylene carbonate, which is a dielectric liquid. When a DC voltage pulse of 200‐ms width was applied to a parallel plane electrode system, the electric field vector distributions, which had the shape of a circle 12 mm in diameter, were measured at time intervals of 3 ms. The measurements were carried out while varying the conductivity of the liquid. The distribution a certain time after applying the voltage pulse seemed to be disturbed. Observation of the time at which the disturbance started would make it possible to determine the behavior and electrical characteristics of the liquid. We also studied the evaluation of remnant charges. © 2011 Wiley Periodicals, Inc. Electron Comm Jpn, 94(9): 45–51, 2011; Published online in Wiley Online Library (wileyonlinelibrary.com). DOI 10.1002/ecj.10351
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