Capacitively graded electrical insulating devices

Claim 2

A device as defined in claim 2 in which the resin is one which includes a carboxylic cyclic structure in the molecule.

Claim 3

A device as defined in claim 2 in which the resin is a cyclohexene oxide resin.

Claim 4

A device as defined in claim 2 in which the resin is glycidyl cycloaliphatic resin.

Claim 5

A device as defined in claim 2 in which the resin is a cycloaliphatic diglycidyl ester resin.

Claim 6

A device as defined in claim 2 in which the resin is diglycidyl ester of hexahydrophthalic acid.

Claim 7

A device as defined in claim 2 in which the powdered ferroelectric material is selected from or constitutes a mixture of two or more members of the group consisting of barium titanate, strontium titanate, calcium titanate, magnesium titanate, lead titanate, and calcium zirconate.

Claim 8

A device as defined in claim 8 in which the powdered ferroelectric material includes at least 50 percent by weight of barium titanate.

Claim 9

A device as defined in claim 9 in which the barium titanate exceeds 60 percent by weight of the ferroelectric powder.

Claim 10

A device as defined in claim 9 in which the barium titanate constitutes about 80 percent by weight of thE ferroelectric powder.

Claim 11

A device as defined in claim 1 in which the ferroelectric material is about 75 percent by weight of th dielectric material.

Claim 12

A device as defined in claim 1 in which the resin is one which includes a carboxylic cyclic structure in the molecule.

Claim 13

A device as defined in claim 1 in which the resin is a cyclohexene oxide resin.

Claim 14

A device as defined in claim 1 in which the resin is glycidyl cycloaliphatic resin.

Claim 15

A device as defined in claim 1 in which the resin is a cycloaliphatic diglycidyl ester resin.

Claim 16

A device as defined in claim 1 in which the resin is diglycidyl ester of hexahydrophthalic acid.

Claim 17

A device as defined in claim 1 in which the powdered ferroelectric material is selected from or constitutes a mixture of two or more members of the group consisting of barium titanate, strontium titanate, calcium titanate, magnesium titanate, lead titanate, and calcium zirconate.

Claim 18

A device as defined in claim 18 in which the powdered ferroelectric material includes at least 50 percent barium titanate by weight of the ferroelectric powder.

Claim 19

A device as defined in claim 19 in which the barium titanate exceeds 60 percent by weight of the ferroelectric powder.

Claim 20

A device as defined in claim 19 in which the barium titanate constitutes about 80 percent by weight of the ferroelectric powder.

Claim 21

A capacitively graded electrical insulating device comprising an elongated series of alternated flat metal and dielectric plates in side abutment, in which the metal plates are divided into longitudinally overlapping groups and the plates of each group are electrically connected together, in which the groups of plates comprise end groups and intermediate groups and each intermediate group includes plates interleaved between plates of each adjacent group, in wich the intermediate groups comprise an odd number of plates, in which the number of plates in the end groups is equal to 1/2 (N+1) where N is the number of plates in each intermediate group, in which each device comprises a module in which a metal plate electrically connected to the end plate of the adjacent end group is exposed at each end thereof, means for interconnecting a pair of like modules with end plates in contact, thereby combining the adjacent end groups of metal plates into a composite intermediate group having the same number of metal plates as the intermediate groups of each module.

Claim 22

A capacitively graded electrical insulating device comprising an elongated series of alternated flat metal and dielectric plates in side abutment, in which the metal plates are divided into longitudinally overlapping groups and the plates of each group are electrically connected together, in which the groups of plates comprise end groups and intermediate groups and each intermediate group includes plates interleaved between plates of each adjacent group, in which the metal plates of each group are in the form of a stamping of metal sheet material having enlarged plate portions and narrow connector portions bent to position the plate portions in spaced parallel relation.

Claim 23

A capacitively graded electrical insulating device comprising an outer tubular insulating body formed of an insulating resin, the ends of said body having radially inwardly extending flanges having central openings therethrough, the interior of said body intermediate said flanges being a cavity of cylindrical configuration, a series of flat, circular, alternated metal and dielectric plates assembled in side abutment filling said cavity, metal mounting and connector plates at each end of said body having a projection extending through the opening in the flange of said insulating body into contact with the metal plate at the adjacent end of the series of plates within said cavity.

Claim 24

An insulating device as defined in claim 24 in which said mounting and connector plates have flat surfaces exposed at the ends of said device for engagemeNt in electrically conducting relation with like surfaces at the ends of like devices.

Claim 25

An insulating device as defined in claim 24 in which one of said mounting and connector plates has a threaded stud extending outwardly therefrom, and the other of said mounting and connector plates has a threaded opening designed to accept the threaded element identical with the stud at the other end thereof.

Claim 26

An insulating device as defined in claim 24 in which said plates are all in the form of complete circular discs, and in which said device constitutes an insulating support for an intermediate portion of a high voltage electric conductor.

Claim 27

An insulating device as defined in claim 24 in which said plates are annular, leaving a central opening in the assembled plates.

Claim 28

An insulating device as defined in claim 24 in which said end mounting and connector plates have continuous inwardly converging flanges at their inner side, said tubular insulating body having outwardly tapered continuous flanges at its ends filling the space between the inner surfaces of said inwardly converging flanges and the adjacent portion of said mounting and connector plates to provide a solid permanent interconnection thereof.

Claim 29

A capacitively graded insulating bushing for passing a high voltage conductor through an opening in a grounded wall comprising an elongated conductor, a tubular metal body surrounding said conductor and having a radial flange intermediate its ends for connection to the wall, said body having an opening therethrough substantially larger than said conductor so as to leave an annular space between its inner surface and the conductor, insulating shield structure filling said space comprising an outer shield element formed of semi-conducting material having an inner longitudinally convex surface and an inner element having its outer surface longitudinally concave and in surface contact with the inner surface of said outer element, the concave and convex surfaces being substantially symmetrical with respect to the plane of said flange, and like capacitively graded insulating structure secured to opposite ends of said metal body.

Claim 30

A bushing as defined in claim 30 in which each of said capacitively graded insulating structures comprises a series of flat annular alternated metal and dielectric rings abutted in side contact with each other, and an outer tubular insulating shell having a central opening in which said rings are received with their outer edges in contact with the inner surface of the central opening in said insulating shell.

Claim 31

A bushing as defined in claim 31 in which the end rings of said series are metal rings, and in which the metal rings at the inner ends of said series are in surface contact with the end surface of siad tubular metal body.

Claim 32

A bushing as defined in claim 32 in which the opneing in said rings is dimensioned to provide an annular space with the conductor passing therethrough, insulating material extending in contact over the inner surface of said series of rings and leaving an annular space with the conductor, and an oil chamber secured to the outer end of said outer tubular shell in communication with the annular space between the insulating material within said series of rings and the conductor extending therethrough.

Claim 33

A capacitively graded insulating bushing for passing a high voltage conductor through an opening in a grounded wall comprising an elongated conductor, a tubular metal body surrounding said conductor and having a radial flange intermediate its ends for connection to the wall, said body having an opening therethrough substantially larger than said conductor so as to leave an annular space between its inner surface and the conductor, insulating material filling the space in said tubular metal body between its inner surface and the conductor therein, an outer tubular insulator shell at each end of said metal body, a series of flat alternated metal and dielectric rings within each of said insulaTor shells, and means electrically connecting the conductor to the metal rings at the remote ends of said series, and means electrically connecting said tubular metal body to the metal rings at the adjacent ends of said series.

Claim 34

A capacitively graded electrical insulating device in module form comprising an elongated series of alternated flat metal and dielectric plates in side abutment, in which the metal plates are divided into longitudinally overlapping groups and the plates of each group are electrically connected together, in which the groups of plates comprise end groups and intermediate groups and each intermediate group includes plates interleaved between plates of each adjacent group, in which said device comprises a metal plate electrically connected to the end plate of each of the adjacent end groups and exposed at each end thereof, means for interconnecting a pair of like modules with end plates in contact for combining the adjacent end groups of metal plates into a composite intermediate group having the same number of metal plates as the intermediate groups of each module.

Claim 35

Acapacitively graded electrical insulating device in module form capable of mechanical and electrical connection to like devices comprising a generally tubular insulating shell, a multiplicity of thin imperforate plates in face to face relation within said shell, said plates being of altered metal and dielectric material, end plates closing at least that portion of said shell which receives said thin plates and electrically connected to the thin metal plates adjacent thereto, and means on said end plates for mechanically and electrically connecting end plates of a plurality of said devices.

Claim 36

A device as defined in claim 36 in which said plates are complete circular plates.

Claim 37

A device as defined in claim 36 in which said plates are annular.

Claim 38

A device as defined in claim 36 in which said shell is cast around said thin plates.

Claim 39

A device as defined in claim 39 in which said shell is cast into interlocking engagement with said end plates.

Claim 40

A device as defined in claim 40 in which the said end plates are exposed at the ends of said shell, and the means for mechanically and electrically connecting end plates of a plurality of devices comprises clamping means for clamping end plates of interconnected devices together.

Claim 41

A device as defined in claim 41 in which said clamping means comprises a threaded stud projecting axially of each device from one end plate of each device, and a threaded recess in the other end plate of such device arranged to receive the threaded stud of a like device.

Claim 42

A device as defined in claim 41 in which said clamping means comprises similarly placed openings in both end plates to receive clamping devices such as nuts and bolts.