Sprague Electric Company

Commonwealth Sprague Capacitor Inc.

Andrew E Dequasie

Sidney D Ross

Herbert L Rice

A metalized film capacitor has a plurality of electrodes separated by dielectric spacers and contains a dielectric fill system including 1 to 50 wt % of calcium oxide scavenger. This dielectric fill system is especially useful in aluminum metalized film capacitors for AC service.

Capacitor having dielectric material containing calcium oxide

A dry metallized film capacitor which includes an interrupter is potted with a plasticized urethane containing unreacted isocyanate groups. Sufficient plasticizer is used so that the potting material is soft enough to permit functioning of the interrupter and is also viscous enough to remain in place to prevent spillage under leakage or rupture conditions.

Dry metallized film capacitor

An AC metallized film capacitor having a plurality of electrodes separated by a dielectric spacer contains a dielectric fluid and 2 to 10% of .alpha.-naphthyl isocyanate as impregnant system to scavenge moisture and to improve capacitance retention.

AC Capacitor and impregnant therefor

AC life and corona characteristics of a polypropylene-aluminum foil or a metallized film wound capacitor are improved by coating at least the ends of the capacitor with a partially cured urethane containing unreacted isocyanate groups.

AC Capacitor

An AC metallized film capacitor having a plurality of electrodes separated by a dielectric spacer contains as its impregnant system a dielectric fluid and 1-20% of an aliphatic or aromatic isocyanate having unreacted NCO groups to improve life characteristics.

Growing community of inventors

Pownal, VT, United States of America

Andrew E Dequasie