Transformer bushing

Claim 2

A bushing assembly for use with a tank-type electrical transformer adapted to be inserted through an opening in the outer casing of the electrical transformer, said bushing assembly being comprised of a bushing stud and means for securing said stud to the transformer, said bushing stud comprising: a first connector portion made of a conductive material and adapted for connection to an electrical lead within the transformer, a securing portion integral with and made of the same conductive material as said first connector portion, but of a larger diameter, said securing portion adapted to be mounted adjacent the outer casing of the electrical transformer, a second connector portion integral with and made of the same conductive material as said first connector portion and said securing portion, but of a smaller diameter than said securing portion, said second connector portion adapted for connection to an electrical lead outside the transformer, said securing portion having a relatively thin layer of insulating material thereon, and said means for securing said stud to the transformer comprising an externally mating clamp assembly having a central alignment hole for passing around said second connector portion, and a plurality of mounting holes therein adapted for alignment with studs on the outside of the transformer tank, and having insulating properties and being adapted for locating said securing portion on the outside of the tank adjacent the outer casing of the electrical transformer.

Claim 3

The invention of claim 1 wherein said first connector portion and said second connector portion are at least partially threaded.

Claim 4

The invention of claim 1 wherein said first connector portion and said second connector portion are generally symmetrical about said securing portion.

Claim 5

The invention of claim 1 wherein said clamp assembly comprises a metal stamping having a relatively thin layer of insulating material thereon and wherein said mounting holes in said clamp assembly are formed by brass eyelets.

Claim 6

The invention of claim 1 wherein a cushion gasket is used between said clamp assembly and said securing portion.

Claim 7

The invention of claim 1 wherein a sealing gasket is used between said securing portion and the outer casing of the electrical transformer.

Claim 8

The invention of claim 1 wherein said securing portion is generally hexagonal in cross-sectional shape, and wherein said mating clamp assembly is adapted to be placed over and mate with said securing portion.

Claim 9

The invention of claim 7 wherein said clamp assembly is generally triangular in cross-sectional shape so that the three side walls of said clamp assembly mate with three of the six sides of said hexagonal securing portion.

Claim 10

A bushing assembly for use with a tank-type electrical transformer adapted to be inserted through an opening in the outer casing of the electrical transformer, said bushing assembly being comprised of a bushing stud and means for securing said stud to the transformer, said bushing stud comprising: a first connector portion made of a conductive material and adapted for connection to an electrical lead within the transformer, a securing portion integral with and made of the same conductive material as said first connector portion, but of a larger diameter, said securing portion adapted to be mounted on the outside of the tank adjacent the outer casing of the electrical transformer and having threads adjacent said securing portion extending through the opening in the casing into the inside of the tank, a second connector portion integral with and made of the same conductive material as said first connector portion and said securing portion, but of a smaller diameter than said securing portion, said second connector portion adapted for connection to an electrical lead outside the transformer, said securing portion having a relatively thin layer of insulating material thereon, and said means for securing said stud to the transformer comprising a threaded securing member having insulating properties and being adapted for locating said securing portion on the outside of the tank adjacent the outer casing of the electrical transformer, by engaging the threads adjacent said securing portion which extend into the inside of the tank.

Claim 11

A bushing assembly for use with a tank-type electrical transformer adapted to be inserted through an opening in the outer casing of the electrical transformer, said bushing assembly being comprised of a bushing stud and means for securing said stud to the transformer, said bushing stud comprising: a first connector portion made of a conductive material and adapted for connection to an electrical lead within the transformer, a securing portion integral with and made of the same conductive material as said first connector portion, but of a larger diameter, said securing portion adapted to be mounted on the outside of the tank adjacent the outer casing of the electrical transformer and having threads adjacent said securing portion extending through the opening in the casing into the inside of the tank, a second connector portion integral with and made of the same conductive material as said first connector portion and said securing portion, but of a smaller diameter than said securing portion, said second connector portion adapted for connection to an electrical lead outside the transformer, said securing portion having a relatively thin layer of insulating material thereon, and said means for securing said stud to the transformer comprising a threaded securing member having insulating properties and being adapted for locating said securing portion on the outside of the tank adjacent the outer casing of the electrical transformer, by engaging the threads adjacent said securing portion which extend into the inside of the tank.

Claim 12

The invention of claim 9 wherein said second connector portion includes a threaded hole adapted to receive matably threaded electrical connection means.

Claim 13

The invention of claim 9 wherein said securing member comprises a generally circular nut-like member.

Claim 14

The invention of claim 9 wherein said securing member is nonmetallic.

Claim 15

The invention of claim 12 wherein said securing member is made of a molded epoxy.

Claim 16

The invention of claim 12, wherein said composite securing flange is generally hex-shaped, said clamp member being a generally laterally-extending plate-like member of a generally triangular shape and having a wall portion extending generally longitudinally from each of the three sides thereof, said clamp member further being adapted to receive said generally hex-shaped composite securing flange between said wall portions with three of the sides of said composite securing flange aligned in a generally mating registry with the three sides of said clamp member and with the remaining three sides of said composite securing flange generally aligned with but laterally spaced from the apexes of said clamp member, said first three sides of said composite securing flange laterally interfering with the three sides of said clamp member when in said mating registry with one another to prevent said composite securing flange and said connector portions from rotating laterally relative to said clamp member, one of said attachment means for securing said clamp member to the casing being located generally between each of said remaining three sides of said composite securing flange and its associated apex of said clamp member.

Claim 17

A bushing assembly for use with an electrical transformer having a casing, said bushing assembly being adapted to protrude through an opening in the casing of the electrical transformer in order to provide electrical connection between electrical conductors on opposite sides of the casing, said bushing assembly comprising conductor means and clamping means for securing said conductor means to the transformer, said conductor means including first and second connector portions electrically integral with one another and composed of an electrically conductive material, said first and second connector portions being adapted for electrical connection to said electrical conductors on opposite sides of the casing of the electrical transformer, at least one of said first and second connector portions extending longitudinally through the opening in the casing of the electrical transformer, said conductor means further including a composite securing flange fixedly extending laterally from a generally intermediate location along said bushing assembly generally between said first and second connector portions, said composite securing flange including an electrically conductive inner member and a relatively thin outer coating of electrically insulating material following the contour of said inner member, said relatively thin outer coating of electrically insulating material being of a substantially uniform thickness and extending over a part of each of said connector portions generally adjacent said composite securing flange, said composite securing flange being generally plate-like in configuration with its longitudinal thickness being substantially less than the longitudinal length of said first and second conductors and with its lateral dimensions being substantially larger than the lateral dimensions of said first and second conductors, said composite securing flange further being adapted to be mounted generally adjacent the casing of the electrical transformer with said thin outer coating of electrically insulating material interposed between said inner member of said composite securing flange and said casing, said clamping means including a clamp member engageable with said conductor means and having an opening for receiving at least one of said first and second connector portions extending therethrough and attachment means for securing said clamp member to one side of the casing, said engagement between said clamp member and said conductor means biasing said composite securing flange toward said one side of the casing of the electrical transformer, said composite securing flange being generally hex-shaped, said clamp member being a generally laterally-extending plate-like member of a generally triangular shape and having a wall portion extending generally longitudinally from each of the three sides thereof, said clamp member further being adapted to receive said generally hex-shaped composite securing flange between said wall portions with three of the sides of said composite securing flange aligned in a generally mating registry with the three sides of said clamp member and with the remaining three sides of said composite securing flange generally aligned with but laterally shaped from the apexes of said clamp member, said first three sides of said composite securing flange laterally interfering with the three sides of said clamp member when in said mating registry with one another to prevent said composite securing flange and said connector portions from rotating laterally relative to said clamp member, one of said attachment means for securing said clamp member to the casing being located generally between each of said remaining three sides of said composite securing flange and its associated apex of said clamp member, said attachment means comprising a number of threaded fastener means mounted on said one side of the transformer casing, said composite securing flange having an aperture extending through each of said spaces between said three apexes of said clamp member and said remaining three sides of said composite securing flange, said apertures being aligned for receiving one of said fastener means extending through each of said apertures.

Claim 18

A bushing assembly for use with an electrical transformer having a casing, said bushing assembly being adapted to protrude through an opening in the casing of the electrical transformer in order to provide electrical connection between electrical conductors on opposite sides of the casing, said bushing assembly comprising conductor means and clamping means for securing said conductor means to the transformer, said conductor means including first and second connector portions electrically integral with one another and composed of an electrically conductive material, said first and second connector portions being adapted for electrical connection to said electrical conductors on opposite sides of the casing of the electrical transformer, at least one of said first and second connector portions extending longitudinally through the opening in the casing of the electrical transformer, said conductor means further including a composite securing flange fixedly extending laterally from a generally intermediate location along said bushing assembly generally between said first and second connector portions, said composite securing flange including an electrically conductive inner member and a relatively thin outer coating of electrically insulating material following the contour of said inner member, said relatively thin outer coating of electrically insulating material being of a substantially uniform thickness and extending over a part of each of said connector portions generally adjacent said composite securing flange, said composite securing flange being generally plate-like in configuration with its longitudinal thickness being substantially less than the longitudinal length of said first and second conductors and with its lateral dimensions being substantially larger than the lateral dimensions of said first and second conductors, said composite securing flange further being adapted to be mounted generally adjacent the casing of the electrical transformer with said thin outer coating of electrically insulating material interposed between said inner member of said composite securing flange and said casing, said clamping means including a clamp member engageable with said conductor means and having an opening for receiving at least one of said first and second connector portions extending therethrough and attachment means for securing said clamp member to one side of the casing, said engagement between said clamp member and said conductor means biasing said composite securing flange toward said one side of the casing of the electrical transformer, said composite securing flange being generally hex-shaped, said clamp member being a generally laterally-extending plate-like member of a generally triangular shape and having a wall portion extending generally longitudinally from each of the three sides thereof, said clamp member further being adapted to receive said generally hex-shaped composite securing flange between said wall portions with three of the sides of said composite securing flange aligned in a generally mating registry with the three sides of said clamp member and with the remaining three sides of said composite securing flange generally aligned with but laterally shaped from the apexes of said clamp member, said first three sides of said composite securing flange laterally interfering with the three sides of said clamp member when in said mating registry with one another to prevent said composite securing flange and said connector portions from rotating laterally relative to said clamp member, one of said attachment means for securing said clamp member to the casing being located generally between each of said remaining three sides of said composite securing flange and its associated apex of said clamp member, said attachment means comprising a number of threaded fastener means mounted on said one side of the transformer casing, said composite securing flange having an aperture extending through each of said spaces between said three apexes of said clamp member and said remaining three sides of said composite securing flange, said apertures being aligned for receiving one of said fastener means extending through each of said apertures.

Claim 19

The invention of claim 15, wherein said clamp member also includes a relatively thin outer coating of electrically insulating material generally following its contour.

Claim 20

A bushing assembly for use with an electrical transformer having a casing said bushing assembly being adapted to protrude through an opening in the casing of the electrical transformer in order to provide electrical connection between electrical conductors on opposite sides of the casing, said bushing assembly comprising conductor means and clamping means for securing said conductor means to the transformer, said conductor means including first and second connector portions electrically integral with one another and composed of an electrically conductive material, said first and second connector portions being adapted for electrical connection to said electrical conductors on opposite sides of the casing of the electrical transformer, at least one of said first and second connector portions extending longitudinally through the opening in the casing of the electrical transformer, said conductor means further including a composite securing flange fixedly extending laterally from a generally intermediate location along said bushing assembly generally between said first and second connector portions, said composite securing flange including an electrically conductive inner member and a relatively thin outer coating of electrically insulating material following the contour of said inner member, said composite securing flange being generally plate-like in configuration with its longitudinal thickness being substantially less than the longitudinal length of said first and second conductors and with its lateral dimensions being substantially larger than the lateral dimensions of said first and second conductors, said composite securing flange further being adapted to be mounted generally adjacent the casing of the electrical transformer with said thin outer coating of electrically insulating material interposed between said inner member of said composite securing flange and said casing, said clamping means including a clamp member engageable with said conductor means and having an opening for receiving at least one of said first and second connector portions extending therethrough and attachment means for securing said clamp member to the casing, said engagement between said clamp member and said conductor means biasing said composite securing flange toward one side of the casing of the electrical transformer.

Claim 21

A bushing assembly for use with an electrical transformer having a casing said bushing assembly being adapted to protrude through an opening in the casing of the electrical transformer in order to provide electrical connection between electrical conductors on opposite sides of the casing, said bushing assembly comprising conductor means and clamping means for securing said conductor means to the transformer, said conductor means including first and second connector portions electrically integral with one another and composed of an electrically conductive material, said first and second connector portions being adapted for electrical connection to said electrical conductors on opposite sides of the casing of the electrical transformer, at least one of said first and second connector portions extending longitudinally through the opening in the casing of the electrical transformer, said conductor means further including a composite securing flange fixedly extending laterally from a generally intermediate location along said bushing assembly generally between said first and second connector portions, said composite securing flange including an electrically conductive inner member and a relatively thin outer coating of electrically insulating material following the contour of said inner member, said composite securing flange being generally plate-like in configuration with its longitudinal thickness being substantially less than the longitudinal length of said first and second conductors and with its lateral dimensions being substantially larger than the lateral dimensions of said first and second conductors, said composite securing flange further being adapted to be mounted generally adjacent the casing of the electrical transformer with said thin outer coating of electrically insulating material interposed between said inner member of said composite securing flange and said casing, said clamping means including a clamp member engageable with said conductor means and having an opening for receiving at least one of said first and second connector portions extending therethrough and attachment means for securing said clamp member to the casing, said engagement between said clamp member and said conductor means biasing said composite securing flange toward one side of the casing of the electrical transformer.

Claim 22

The invention of claim 17, wherein said composite securing flange is clamped between said clamp member and the casing of the electrical transformer when said clamp member is secured to the casing.