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Optical measurement of electric field distributions with time in a liquid at DC pulse voltage
Author(s) -
Ihori Haruo,
Ohnishi Atsushi,
Ninomiya Sei,
Fujii Masaharu
Publication year - 2010
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.20940
Subject(s) - electric field , voltage , materials science , pulse (music) , dielectric , field (mathematics) , space charge , system of measurement , distribution (mathematics) , liquid dielectric , electrical engineering , physics , optics , optoelectronics , engineering , mathematics , mathematical analysis , quantum mechanics , astronomy , pure mathematics , electron
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 the electrooptic Kerr effect and the CT method. We developed an optical system that could measure electric field distributions in about 1 ms. In this study, when a DC voltage pulse of 50 ms width was applied to a sphere‐to‐plane electrode system, electric field distributions on some measurement planes were measured at intervals of 1 ms. The distribution a short time after application of the voltage pulse seemed to be disturbed. It is inferred that the “disturbance” was caused by changes in the density of the liquid due to movement of certain carriers in the liquid. Observation of the time of onset of the disturbance would make it possible to determine the behavior and electric characteristics of the liquid. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 172(1): 1–9, 2010; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20940