US3725741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential transformer mounting arrangement particulary for ground fault interrupter apparatus
Assignee: Westinghouse Electric Corp
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Filing: 1971-06-30
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Granted: 1973-04-03
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Expires: 1991-06-30
Abstract
Abstract A coaxial conductor passing through an apertured core of a differential transformer is provided with an outer conductor in the form of a rigid tubular conductive member with one or more insulated inner conductors therein. Outside the core, the rigid tubular member is bent at two substantially right angles forming two parallel legs. At least an end of one leg is attached to a fixed support so that the coaxial conductor provides a way of fixing the electrical characteristics of the transformer as well as substantially mechanically securing the core of the transformer by a simple and effective means.
Inventors
- 👤 J Misencik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:30
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/20; H01F38/22; H01F38/28; H01F38/30; H01F38/305; H01F27/00; H01F27/28; H01F27/2823; H01F2027/2833; H01H; H01H83/00; H01H83/14; H01H83/144; H01H2083/148
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
Ground fault interrupter apparatus of the differential transformer type comprising: an apertured magnet core; at least two primary conductors extending through said core, said primary conductors comprising an outer tubular conductor and at least one inner wire conductor in a substantially coaxial arrangement, said outer tubular conductor being of relatively rigid conductive material and having a first portion within said core and two other portions extending at substantially right angles to said first portion, said outer tubular conductor having an extremity secured to a fixed support member, said core being supported substantially only by said tubular conductor; a secondary winding comprising a plurality of turns on said core; a trip circuit responsive to sensed signals on said secondary winding, said trip circuit being at least partially disposed within the space between said two other portions of said outer tubular conductor.
Claim 2
Dependent Claim
140 words
Ground fault interrupter apparatus of the differential transformer type comprising: an apertured magnet core; at least two primary conductors extending through said core, said primary conductors comprising an outer tubular conductor and at least one inner wire conductor in a substantially coaxial arrangement, said outer tubular conductor being of relatively rigid conductive material and having a first portion within said core and two other portions extending at substantially right angles to said first portion, said outer tubular conductor having an extremity secured to a fixed support member, said core being supported substantially only by said tubular conductor; a secondary winding comprising a plurality of turns on said core; a trip circuit responsive to sensed signals on said secondary winding, said trip circuit being at least partially disposed within the space between said two other portions of said outer tubular conductor.
Claim 3
Dependent Claim
24 words
The subject matter of claim 1 wherein: said inner conductor in the form of a single insulated wire disposed in said outer tubular conductor.
Claim 4
Dependent Claim
44 words
The subject matter of claim 1 wherein: said primary conductors number at least three and include an outer tubular conductor and at least two inner wire conductors with said inner conductors twisted together over at least the portion of their length within said core.
Claim 5
Dependent Claim
32 words
The subject matter of claim 1 wherein: said core is substantially held in place by the portions of said tubular conductor extending at substantially right angles to the portion within said core.
Claim 6
Dependent Claim
30 words
The subject matter of claim 1 wherein: said core is substantially held in place by the first portion of said tubular conductor snugly fitting within the aperture of said core.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |