Abstract: A medium high voltage capacitor roll section comprises a sheet of double metallized plastic film and a sheet of paper adjacent thereto, with the paper and film forming parallel dielectrics. A dielectric liquid impregnant is used and the roll is wound sufficiently tightly so that after impregnation with a dielectric liquid impregnant and consequent swelling there is an essentially zero negative space factor within the roll.

Abstract: A method of producing a hard roll capacitor includes winding on a core a capacitor roll using heat shrinkable synthetic resin strips some of which are metallized while maintaining tension on the strips above about 200 grams per inch of strip width per mil thickness. The roll is then subjected to temperature sufficient to shrink the strips on the roll after which the roll is placed in a casing and its ends are covered with a dielectric liquid. The process results in a capacitor with only a narrow margin section of the roll at the edges being wetted by the dielectric liquid.

Abstract: A wound AC capacitor is made of resin strips with the electrodes being metal films on resin strips. The capacitor is wound on a hard core and is partially impregnated with a non-halogenated liquid.