Back to results
US 4,538,200 AGranted
Power connection apparatus having integrated surge arrestor
AssigneeA. O. Smith Corporation
InventorMaqboolhusein G. Shaikh
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeA. O. Smith Corporation
InventorMaqboolhusein G. Shaikh
Estimating the term…
A power cable for a submersible motor has a releasable plug-in connector for releasable attachment to the motor. An oil-filled motor has solid conductors to the motor connector part and the flexible conductors to the cable connector part. The cable connector part has a plurality of lead terminals located in a common plane and a plastic molded shell which is flat and rectangular. A shell flange is bolted to the motor. An integrated voltage surge arrestor is located in an opening in the shell which exposes the terminals, and includes a thin arrestor block of silicon carbide or metal oxide varistor secured to a mounting plate which seals the opening. The silicon carbide block is a porous fragile unit supported by the plate and connected to ground by the well liquid, or by a connection to the clamp bolts. The two outer terminals are connected to the 230 voltage lines and the opening is formed with intermediate line insulation separating the chambers of such outer terminals. The arrestor assembly is similarly formed in either a two-wire or a three-wire submersible motor cable. The surge arrestor may be located within a motor and in other cable configurations.
A power line unit having a least two power leads, an insulating shell encasing said power leads, said shell including a sidewall arrestor opening exposing said power leads, an arrestor unit secured within said opening to form an exterior exposed wall and secured to the edges of said opening to close said opening and including an arrestor block within said opening in opposed operative relation to said exposed leads, and said arrestor unit having a ground connection secured to said arrestor block.
A power line unit including at least three power leads in a substantially common plane, an insulating shell encasing said power leads, said shell including a sidewall arrestor opening exposing the two outer leads constituting said two exposed leads and being separated by an insulation ledge encasing the central lead, an arrestor unit including a mounting plate secured to the outer portion of said shell and closing said opening, an arrestor block secured to said plate and projecting into said opening into abutting engagement with said insulation ledge to separate the chambers surrounding said exposed leads, and means sealing said plate to said shell to form a liquid tight arrestor chamber.
A power cable having an end connector part forming one half of a two-part releasable plug-in connector, wherein said end connector includes a cable end having at least two power leads including an outer insulation encasing the conductive wires, comprising elongated plug-in terminals affixed to said wires one each to each of said leads and extending longitudinally of said leads, a flat insulator shell encasing said terminals and at least the terminal portion of said outer insulation, said shell having a width adapted to encase at least three of said terminals and a thickness substantially less than said width, said shell having a sidewall opening exposing only the corresponding side surfaces of selected ones of said terminals, said opening including stepped side edges defining a projecting wall means between said exposed terminals and having outer edges coplanar with said wall means, a closure plate sealed within said opening and including a surge arrestor block abutting said wall means and edges to define a surge chamber about each of said exposed terminals with the inner face of said block in opposed spaced from said exposed terminals, and means sealing the closure plate to said shell to form a watertight surge chamber about each of said exposed terminals.
Dependencies are inferred from the claim text.