Vaporization cooled electrical apparatus

Claim 1

An electrical inductive apparatus comprising: a sealed housing; an electrical winding having top and bottom ends disposed in inductive relation with a magnetic core in said sealed housing; said electrical winding having a plurality of radially spaced cooling ducts extending between said top and bottom ends of said electrical winding; a dielectric fluid, vaporizable within the normal operating temperature range of said electrical inductive apparatus, disposed within said housing, said dielectric fluid having a liquid level above the bottom of said housing; means for supplying said dielectric fluid from said bottom portion of said housing to the top portion of said housing; means for applying compressive stress to said top and bottom ends of the electrical winding, said means including first and second pressure rings, with said first pressure ring disposed around the magnetic core and adjacent said top end of said electrical winding and said second pressure ring disposed around said magnetic core and adjacent said bottom end of said electrical winding, and means for applying pressure to said first and second pressure rings to hold said electrical winding in compression; and means for distributing said dielectric fluid to the top end of said ducts, said distributing means disposed adjacent said top end of said winding and in fluid flow communication with said supplying means, said distributing means including a first member having a plurality of spacers attached to one surface thereof, said first member disposed with said spacers in registry with said top end of said electrical winding and the other surface of said first member in registry with said first pressure ring such that a first passage is formed between said top end of said electrical winding and said first member and compressive force is maintained on said electrical winding, said distributing means including at least one conduit disposed in said first passage and having first and second ends with at least one of said ends disposed in fluid flow communication with said supplying means, said conduit being formed of electrical insulating material and having a plurality of longitudinal and circumferential spaced apertures therein, said conduit further having a predetermined configuration across said top end of said electrical winding in which said apertures are located adjacent said cooling ducts such that said dielectric fluid is uniformly distributed over said cooling ducts; said distributing means further including a second member having a plurality of spacers attached to one surface thereof, said second member disposed with said spacers in registry with said bottom end of said winding and the other surface of said second member in registry with said second pressure ring to form a second passage below said electrical winding.