Masao Murata

Influence of the Fines on the Dielectric and Tensile Breakdown of Oil-Impregnated Paper

The ideal composition of fibers for insulating paper has been clarified by investigating the influence of the shape of fines on dielectric and tensile breakdown of oil-impregnated Kraft paper for oil filled (OF) cable at 105N/M oil. Furthermore, the pulp refining methods for producing such insulating paper have been investigated.

Quantitative estimation of paper formation and its effect on oil-impregnated paper

It is generally considered that paper formation, if it is good, will have little effect on the dielectric breakdown strength of oil-impregnated Kraft paper for oF cable. However, little is known about defining good formation quantitatively.

A new approach to the dielectric breakdown of oil-impregnated paper

In the course of the investigation on the dielectric breakdown mechanisms of the laminated oil-impregnated paper system, careful consideration should be given to both the non-uniformity of insulating Kraft paper and the behavior of carriers (electron or ions) in the laminated oil-impregnated paper system. Thus, in this paper, the new approach for solving these problems is proposed.

Influence of insulating paper formation on the dielectric and tensile breakdown of oil-impregnated paper

The influences of insulating paper formation on the dielectric and tensile breakdown of oil-impregnated paper are discussed. It is concluded that Kraft insulating paper formation, which is measured by Beta-Radiography method, is classified roughly into three types: Type I, Type II and Type III, and that the insulating paper of Type I is most appropriate for the oil-impreganted Kraft paper for OF cable. In addition, the first prerequisite for making the insulating paper of Type I is examined.

Paper making conditions and breakdown in oil impregnated paper

Nonuniformity in insulating paper has drawn our particular interest as an indispensable factor in order to clarify the dielectric breakdown mechanism in oil-impregnated paper.

Influence of the fines on the dielectric and tensil breakdown of oil-impregnated paper

The ideal composition of fibers for insulating paper has been clarified by investigating the influence of the shape of fines on dielectric and tensil breakdown of oil-impregnated Kraft paper for OF cable (at oil pressure 1kg/cm2). Furthermore, the pulp refining methods for producing such insulating paper has been developed.