US3761853A — Mechanically variable modular high reactivity pow…

Claim 1

Independent Claim 260 words

A mechanically variable high reactivity power inductor for A.C. testing of large capacitance loads at high voltage comprising: a. a plurality of inductor modules vertically stacked one on top of another to form a stacked inductor; b. each module including a container formed of insulating material having a bottom and side walls, said container being adapted to contain dielectric liquid; c. a magnetically permeable core structure in each of said containers including a plurality of magnetically permeable core segments; d. said core segments being mounted for relative horizontal movement defining at least one gap of horizontally variable spacing; e. at least one winding within each of said containers surrounding said gap and the adjacent portions of said core segments, whereby the inductance of such winding is varied by varying the gap spacing; f. means connecting said windings in a series circuit extending along said stack; g. a horizontal feed screw within each of said containers for relatively horizontally moving said core segments to vary the gap spacing; h. a drive shaft for each of said feed screws extending horizontally out through the side walls of each of said containers; i. the drive shafts for the respective containers being located one above the other in said stacked inductor; j. a common drive member formed of insulation material extending vertically along said stacked inductor and being coupled to each of said drive shafts for rotating them simultaneously; and k. drive means for rotating said common drive member for simultaneously varying the inductance of all of the inductor modules in said stacked inductor.

Claim 2

Dependent Claim 260 words

A mechanically variable high reactivity power inductor for A.C. testing of large capacitance loads at high voltage comprising: a. a plurality of inductor modules vertically stacked one on top of another to form a stacked inductor; b. each module including a container formed of insulating material having a bottom and side walls, said container being adapted to contain dielectric liquid; c. a magnetically permeable core structure in each of said containers including a plurality of magnetically permeable core segments; d. said core segments being mounted for relative horizontal movement defining at least one gap of horizontally variable spacing; e. at least one winding within each of said containers surrounding said gap and the adjacent portions of said core segments, whereby the inductance of such winding is varied by varying the gap spacing; f. means connecting said windings in a series circuit extending along said stack; g. a horizontal feed screw within each of said containers for relatively horizontally moving said core segments to vary the gap spacing; h. a drive shaft for each of said feed screws extending horizontally out through the side walls of each of said containers; i. the drive shafts for the respective containers being located one above the other in said stacked inductor; j. a common drive member formed of insulation material extending vertically along said stacked inductor and being coupled to each of said drive shafts for rotating them simultaneously; and k. drive means for rotating said common drive member for simultaneously varying the inductance of all of the inductor modules in said stacked inductor.

Claim 3

Dependent Claim 216 words

A mechanically variable high reactivity power inductor for A.C. testing as claimed in claim 1, in which: a. said magnetically permeable core structures each contain two U-shaped core segments having their legs horizontally positioned in end-to-end relationship defining a pair of gaps of which the spacing can be varied and said core segments are positioned in a vertical plane within each container such that one of said gaps is positioned above the other providing an upper and a lower gap, b. an upper and a lower winding are provided in each of said modules respectively surrounding said upper and lower gaps, c. said windings being wound in layers, d. said upper and lower winding having the terminals of their innermost layers electrically connected to said magnetically permeable core structure, e. the upper winding in each module having its terminal of its outermost layer electrically connected to the terminal of the outermost layer of the lower winding in the module located immediately above in the module stack; f. each of said containers has a cover of electrically conductive material with a corona ring encircling the cover, and g. said terminals of the outermost layers also are electrically connected to the respective corona rings and to the respective electrically conductive covers of the modules in said inductor stack.

Claim 4

Dependent Claim 156 words

A mechanically variable high reactivity power inductor for A.C. testing as claimed in claim 2, in which: a. there are upper and lower feed screws located in each of said modules formed of strong material of low magnetic permeability; b. said upper and lower feed screws extending horizontally through the centers of the horizontally positioned upper and lower legs of the two U-shaped core segments and extending across the upper and lower gaps; c. one of said core segments being fixed in positions within the module and the other core segment being mounted for movement toward and away from the fixed segment for varying the gap spacing; and d. upper and lower feed nuts mounted on the movable core segment and respectively engaging the upper and lower feed screws; and e. the drive shaft for each of said modules being coupled to the upper and lower feed screws within the module for producing simultaneous rotation thereof.

Claim 5

Dependent Claim 221 words

An accurately mechanically variable high reactivity power inductor for A.C. testing of large capacitance loads at high voltage comprising: a. a cascaded plurality of vertically stacked inductor modules electrically connected in series, each inductor module carrying a portion of the voltage across the inductor and including: b. an enclosure adapted to contain dielectric liquid; c. a magnetically permeable core supported in a vertical plane in the enclosure and being formed of horizontally separable core segments providing upper and lower gaps therebetween, oNe core segment being stationary and the other core segment being horizontally movable to control the size of the upper and lower gaps; d. upper and lower electrical windings around the magnetic core and bridging the upper and lower gaps between the core segments; and e. feed screws engaging the movable core segment to produce horizontal movement of the movable core segment to control gap size; f. said cascaded inductor having means for electrically connecting the upper electrical winding of each module to the lower electrical winding of the module adjacent to and above it, and g. further having ganged driving means along the side of the inductor operatively coupled to the feed screws in each module for synchronous rotation thereof to simultaneously control the gap spacing in each of the modules to vary the inductance of the power inductor.

Claim 6

Dependent Claim 221 words

An accurately mechanically variable high reactivity power inductor for A.C. testing of large capacitance loads at high voltage comprising: a. a cascaded plurality of vertically stacked inductor modules electrically connected in series, each inductor module carrying a portion of the voltage across the inductor and including: b. an enclosure adapted to contain dielectric liquid; c. a magnetically permeable core supported in a vertical plane in the enclosure and being formed of horizontally separable core segments providing upper and lower gaps therebetween, oNe core segment being stationary and the other core segment being horizontally movable to control the size of the upper and lower gaps; d. upper and lower electrical windings around the magnetic core and bridging the upper and lower gaps between the core segments; and e. feed screws engaging the movable core segment to produce horizontal movement of the movable core segment to control gap size; f. said cascaded inductor having means for electrically connecting the upper electrical winding of each module to the lower electrical winding of the module adjacent to and above it, and g. further having ganged driving means along the side of the inductor operatively coupled to the feed screws in each module for synchronous rotation thereof to simultaneously control the gap spacing in each of the modules to vary the inductance of the power inductor.

Claim 7

Dependent Claim 72 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 4 wherein, in each inductor module, the upper and lower electrical windings are electrically interconnected in series and the connection between said windings is connected to the magnetic core, whereby the electric field strength between the electrical windings and the core is minimized, and whereby the magnetic cores stand at electrical potentials distributed along the vertical length of the inductor.

Claim 8

Dependent Claim 64 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 5 wherein, in each inductor module, the electrical windings proceed convolutely outwardly, and wherein the inner ends of the windings are electrically connected to the magnetic core, and the outer ends of the windings of adjacent modules are electrically interconnected, whereby the electric field strength between windings and magnetic core is minimized.

Claim 9

Dependent Claim 28 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 6 wherein the inner ends of the windings are electrically connected to the stationary core segment.

Claim 10

Dependent Claim 69 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 4 wherein the feed screws engaging the movable core segments are also rotatably coupled to the stationary core segment and are formed of strong material of low magnetic permeability being disposed horizontally across the upper and lower gaps in a position to accept as an axial compressive load the electromagnetic attractive forces developed between the core segments.

Claim 11

Dependent Claim 99 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 8 wherein the feed screws are disposed internally of the magnetic core segments in horizontal passages provided therein, and wherein the feed screws are coupled to the stationary core segment by thrust bearing means mounted in the horizontal passages and are engaged with the movable core segment by means mounted in the horizontal passages and engaging the screw threads on the feed screws, rotation of the feed screws thereby producing horizontal movement of the movable core segment to control the gap size between the separable core segments.

Claim 12

Dependent Claim 79 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 9 wherein the thrust bearing means comprises a sleeve surrounding the feed screw and firmly secured to the stationary core segment, horizontally separated mounts secured in the sleeve, horizontally separated mounts secured to the feed screw, and opposed thrust bearings interposed between the sleeve mounts and feed screw mounts to maintain the sleeve and feed screw in fixed axial relation while allowing the feed screw to rotate.

Claim 13

Dependent Claim 43 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 10 further comprising self-aligning sockets interposed between the sleeve and feed screw mounts adjacent the thrust bearings for maintaining the thrust retention forces parallel to the axis of the feed screw.

Claim 14

Dependent Claim 38 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 10 whereiN said sleeve is secured to the stationary core segment by bolts attached to the sleeve and extending to the exterior of the core segment.

Claim 15

Dependent Claim 91 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 9 wherein the feed screw thread engaging means comprises a sleeve surrounding the feed screw and secured to the movable core segment, horizontally separated mounts secured in the sleeve, a nut secured to one mount for engaging the feed screw and translating rotation of the feed screw into horizontal movement of the movable core segment, and means secured to the other mount for radially confining the feed screw, whereby the movable core segment travels parallel to the feed screw.

Claim 16

Dependent Claim 24 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 13 wherein the means radially confining the feed screw is a bearing.

Claim 17

Dependent Claim 51 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 8 wherein the feed screws are supported at one end by the stationary core segment and at the other end by a vertical frame, and wherein the movable core segment is supported by the feed screws between their ends.

Claim 18

Dependent Claim 56 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 15 further comprising a shaft rotatably mounted on the frame and extending to the exterior of the enclosure, and means rotatably linking the feed screws to the shaft, the ganged drive means being connected to the shaft of each module for simultaneous rotation thereof.

Claim 19

Dependent Claim 35 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 15 further comprising a second vertical frame for supporting the electrical windings, and a third vertical frame for supporting the stationary core segment.

Claim 20

Dependent Claim 69 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 4 wherein in each module the upper and lower electrical windings which bridge the upper and lower gaps between the separable core segments are offset, with the ends of the stationary core segment lying between the winding center and outer edge, whereby gap size may be increased while still maintaining effective fringing confinement with the electrical windings.

Claim 21

Dependent Claim 39 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 18 wherein the ends of the stationary core segments lie approximately between one-fourth and one-half of the distance from the winding center to the winding outer edge.

Claim 22

Dependent Claim 65 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 4 wherein, in each module, the enclosure around the magnetic core has bottom and top walls arranged for mating contact with the bottom and top walls of adjacent modules, and a side wall with an elongate cross-section, the longer dimension of the elongate cross-section being parallel to the plane of the magnetic core.

Claim 23

Dependent Claim 52 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 4 further comprising, in each module, a reservoir for dielectric fluid located outside and above said enclosure and gravity feed means for connecting the reservoir to the interior of the enclosure, whereby the enclosure is maintained full of dielectric fluid.

Claim 24

Dependent Claim 33 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 21 wherein each module further comprises a corona ring around the enclosure, and wherein the reservoir is within the corona ring.

Claim 25

Dependent Claim 118 words

An accurately mechanically variable high reactivity power inductor as claimed in claim 4, wherein, in each module, the enclosure around the magnetic core has flat bottom and top walls and a side wall with an oval cross-section, the long axis of the oval being parallel to the plane of the magnetic core, and wherein the stationary core segment is supported by a first vertical frame member secured between top and bottom enclosure walls, the electrical windings are supported by a second vertical frame member secured between top and bottom container walls, and the feed screws support the movable core segment and are in turn supported by a third vertical frame member secured between top and bottom container walls.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1976-09-24	1977-03-26	1977-09-25	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1980-09-24	1981-03-26	1981-09-25	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1984-09-24	1985-03-26	1985-09-25	$7700.00	Window Closed / Lapsed

Mechanically variable modular high reactivity power inductor for high a. c. voltage resonant testing of capacitive loads

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