Abstract
A newly developed technique using an electro-acoustic transducer embedded in an electrode is used to measure the normal electric field as a function of time at the electrode surface of a plane-parallel capacitor enclosing thin film polymeric dielectrics. The displacement current I <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">disp</inf> is then obtained from the product of the dielectric Eonstant ε, electrode area A, and the time derivative of measured electric field E. With the total terminal current I <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ter</inf> measured by a pico-ammeter in series with the test capacitor and voltage source, the conduction current I <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">cond</inf> , is obtained by taking the difference I <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">ter</inf> -I <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">cond</inf> This paper reports that the measured values of I <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">disp</inf> for a step applied voltage varied strongly with the type of polymer film insulation, PE(polyethylene) and PET(polyethylene-terephthalate), and exhibits a dependence on the magnitude and duration of the applied dc voltage, indicating space charge effects.
Published Version
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