Extreme duty encapsulated transformer coil with corrugated cooling ducts and method of making the same

摘要

Methods and devices for an extreme duty transformer with wet wound primary and secondary winding encapsulated with a resin and having corrugated insulating material as cooling ducts as a transformer capable of withstanding extreme mechanical stresses in an underground mining environment. The method includes providing a resin impregnated rectangular winding form, forming a secondary winding with alternating layers of magnet wire with a resin impregnated insulating collar above and below the magnet wire and corrugated insulating material extending the full or partial circumference and width of the coil. An insulating layer of corrugated material and resin impregnated insulation is wound to separate the primary from the secondary windings. The primary winding is wound with alternating magnet wire layers and resin impregnated insulation layers and a resin impregnated outer layer covers the circumference of the coil to produce an oval mechanically robust construction preventing winding displacement and sealing out environmental contaminants.

主权项

1. An extreme duty dry type transformer comprising:
a closed winding form; a secondary winding formed by winding alternating layers consisting essentially of:
a layer of secondary wire-wound around the winding form a distance from a top and a bottom of the winding form with an insulating collar disposed between the top of the winding form and the layer of secondary wire and the bottom of the winding form and the layer of secondary wire; anda secondary corrugated insulating layer with an undulating configuration open at an upper and a lower end extending the full circumference and width of the coil between each next layer of secondary wire to form air cooling ducts, the secondary corrugated insulating layer sandwiched between a first and second resin barrier insulation layer; a barrier insulating layer separating the secondary winding from a primary winding; the primary winding including:
a layer of primary wire wound around the barrier insulating layer; anda primary insulation layer of wet wound resin saturated insulating material extending the full circumference and width of the coil between each next layer of primary wire; and a resin impregnated outer layer wet wound around the circumference of the transformer coil to produce an oval mechanically robust construction preventing winding displacement and sealing out environmental contaminants, the extreme duty transformer coil is rotated during the curing cycle to prevent sagging of the resin impregnated layers and runoff of the resin to form the extreme duty dry type transformer.