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Download Electrical Insulating Liquids (Engineering Dielectrics, Vol by R. Bartnikas PDF

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By R. Bartnikas

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Extra info for Electrical Insulating Liquids (Engineering Dielectrics, Vol 3)

Sample text

Independently Pellat [102,103] derived equivalent expressions, which were based on the assumption that a sudden application of an electric field to a dielectric will cause the dielectric displacement to assume instantaneously a finite value and, thereafter, rise logarithmically to a limiting value [104]. This concept agrees remarkably well with the current approach in dielectric theory where the atomic and electronic polarization are taken to reach the final values instantaneously following the application of the field, and where only the polarization due to the permanent dipoles lags behind the applied field.

18b. 114) toRC where to is the radial frequency term in radians, and R and C are, respectively, the parallel resistance and capacitance of the dielectric. 114 in practice, it should be borne in mind that R is not simply equal to the insulation resistance measured under d-c conditions. Here R is actually the a-c insulation resistance at a given radial frequency co or 2~-f and is normally determined from the measurement of tan 8 and C at the frequency f = l/2~rto, where f is the frequency term in hertz.

This type of designation [75-81] is contrary to that commonly accepted in practice of naming any six-carbon atom ring structure as aromatic. The same type of designation is also employed in ASTM Standard on Tentative Method for Test for Carbon Type Composition of Insulating Oils of Petroleum Origin (D 2140). In any given insulating oil containing a certain percentage of paraffinic, aromatic, and naphthenic constituents, it is quite possible that there may be some molecules that may be only paraffinic and whereas others may be comprised of only paraffinic and naphthenic components, while others may have only aromatic and paraffinic components.

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