ELECTRICAL CAPACITOR HAVING IMPROVED PROVISION FOR HEAT REMOVAL

1,240,859. Capacitors. GENERAL ELECTRIC CO. 8 Oct., 1968 [24 Nov., 1967], No. 47690/68. Heading H1M. End walls 2c, 2d of a capacitor casing shown in cross-section are flexible to respond to thermal expansion and contraction of dielectric fluid filling the casing and impregnating capacitor rolls 4, while side walls 2a, 2b are in heattransfer contact with at least the middle rolls to remove heat therefrom. As shown side walls 2a, 2b are bowed to maintain contact with the rolls which have an insulating wrapping 10 of e.g. kraft paper, but they may be flat and rendered rigid by being sufficiently thick (Fig. 3, not shown) or provided with ribs (Fig. 4, not shown). To improve heat-conduction, additional members of good thermal conductivity may be interposed between the rolls and the casing in direct contact with the side and end walls (Fig. 5, not shown). The dielectric fluid may be liquid, e.g. chlorinated diphenyl or mineral oil, or gaseous e.g. sulphur hexafluoride.