Insulation structures for electrical inductive apparatus

DETAILED DESCRIPTION What is claimed is: 1.
Electrical inductive apparatus comprising: a tank; dielectric fluid disposed in said tank to cool and electrically insulate said electrical inductive apparatus; a magnetic core having a plurality of horizontally-spaced, vertically-extending leg portions connecting first and second yoke portions disposed in said tank; a plurality of electrical winding assemblies disposed in inductive relation with said leg portions of said magnetic core and having a substantially rectangular cross-sectional configuration; a support structure disposed in registry with said magnetic core and said electrical winding assemblies to provide a solid structure that resists movement of said electrical winding assemblies; solid insulation means disposed between at least the adjacent portions of said electrical winding assemblies and between adjacent portions of said electrical winding assemblies and said support structure to provide insulation therebetween; each electrical winding assembly including concentric first and second electrical windings, each formed of a plurality of layers of conductor turns, said first and second electrical windings being subject to radial movement under forces incident to a short circuit; and insulation structures disposed between certain of said first and second windings in said electrical winding assemblies and between said electrical winding assemblies and said solid insulating means and in movable relation therewith to permit relative movement between said insulation structures and said windings under forces exerted on said windings during a short circuit; each of said insulation structures including a plurality of spaced, vertically extending spacer members arranged in a first layer and forming a plurality of passages for the flow of said dielectric fluid therethrough, at least one layer of electrical insulating material disposed on each opposing side of said spacer members with each of said layers of electrical insulating material being unbonded to adjacent portions of said windings and said solid insulating means so as to permit relative movement therebetween, and means for securing said spacer members to said layers of electrical insulating material to form a solid structure that maintains said spacer members in a vertical orientation throughout the operation of said electrical inductive apparatus