Abstract: Electrical inductive apparatus, such as a transformer, cooled by a liquid dielectric having a boiling point within the normal operating temperature range of the apparatus. A vapor lift pump, with few or no moving parts, recirculates the liquid dielectric through a conduit which extends between a supply reservoir and a distribution point, by means of a pressure to velocity energy conversion provided by an orifice in a chamber located in the supply reservoir. The use of a vapor lift pump enables significant improvement in the reliability and power requirements of the apparatus.

Abstract: Electrical inductive apparatus including a winding disposed in inductive relation with a magnetic core. The winding includes a plurality of conductor turns formed of an electrically conductive material having a predetermined cross sectional configuration. The predetermined cross sectional configuration is selected such that an interlocking structure is formed in which the conductor turns of an axially aligned layer of turns are restrained against relative axial movement.