US4623865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Current transformer arrangement for ground fault circuit interrupters
Assignee: General Electric Co
•
Filing: 1985-05-09
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Granted: 1986-11-18
•
Expires: 2005-05-09
Abstract
Abstract A sensing current transformer having a single turn primary winding for ground fault circuit interrupters and breakers utilizes a conductive post extending through the transformer metallic enclosure in combination with the conductive path across the metallic closure as the current sensing path. A four turn primary winding is provided by four metallic staples, each having one leg extending through the transformer aperture, for establishing four independent current sensing paths.
Inventors
- 👤 George W. Kiesel
- 👤 Paul T. Rajotte
- 👤 LeeAnne Wambolt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:08
CPC Classifications
H; H01; H01F; H01F27/00; H01F27/02; H01F27/027
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
182 words
A current transformer arrngement having an integrally arranged single turn primary winding comprising: electrically insulated pedestal means supporting a secondary winding arranged around an apertured core; conductor means extending from said secondary winding for electrical connection between said secondary winding and an electrical circuit; metallic closure means arranged over said secondary winding and having a centrally disposed conductive element electrically connected with said metallic closure and extending from said closure through said apertured core providing a single turn primary winding in an electrical conductive path outside said secondary winding; a plurality of integrally formed tabs extending from a perimeter of said closure, at least two of said tabs being folded under said pedestal means for support and at least one of said tabs extending through said electrically insulated pedestal the end of the said central conductive element extending from said closure means and said at least one of said tabs being connected to board mounted conductors to provide said single turn in said electrical conductive path; whereby said pedestal means provides electric insulation between said tabs and said centrally disposed conductive element.
Claim 2
Dependent Claim
182 words
A current transformer arrngement having an integrally arranged single turn primary winding comprising: electrically insulated pedestal means supporting a secondary winding arranged around an apertured core; conductor means extending from said secondary winding for electrical connection between said secondary winding and an electrical circuit; metallic closure means arranged over said secondary winding and having a centrally disposed conductive element electrically connected with said metallic closure and extending from said closure through said apertured core providing a single turn primary winding in an electrical conductive path outside said secondary winding; a plurality of integrally formed tabs extending from a perimeter of said closure, at least two of said tabs being folded under said pedestal means for support and at least one of said tabs extending through said electrically insulated pedestal the end of the said central conductive element extending from said closure means and said at least one of said tabs being connected to board mounted conductors to provide said single turn in said electrical conductive path; whereby said pedestal means provides electric insulation between said tabs and said centrally disposed conductive element.
Claim 3
Dependent Claim
23 words
The current transformer of claim 1 wherein said pedestal means comprises a planar base and an apertured cylinder extending from said planar base.
Claim 4
Dependent Claim
24 words
The current transformer of claim 1 wherein said metallic closure means comprises a hollow cylinder open at a bottom and closed at a top.
Claim 5
Dependent Claim
15 words
The current transformer of claim 3 wherein said conductive element is fastened to said top.
Claim 6
Dependent Claim
21 words
The current transformer of claim 1 wherein said conductive element comprises a solid metallic cylinder concentrically arranged within said metallic closure.
Claim 7
Dependent Claim
32 words
The current transformer of claim 1 further including electrical insulating means arranged between said metallic closure and said secondary winding to prevent electrical conduction between said metallic closure and said secondary winding.
Claim 8
Dependent Claim
25 words
The current transformer of claim 2 further including a plurality of metallic pins extending through said planar base for electrical connection with said conductor means.
Claim 9
Dependent Claim
23 words
The current transformer of claim 2 wherein said conductive element extends through said apertured cylinder for providing electrical access with said conductive element.
Claim 10
Dependent Claim
31 words
The current transformer of claim 2 further including means defining a slot through said planar base for receiving said other tab and providing electrical access to said other integrally formed tab.
Claim 11
Dependent Claim
55 words
The current transformer of claim 7 further including a printed wire board carrying said electric circuit and having socket means formed therein for receiving both said conductive element and said metallic pins to provide electrical connection between said secondary winding and said electric circuit and between said single turn primary winding and said electric circuit.
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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) | 1989-11-17 | 1990-05-19 | 1990-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-17 | 1994-05-19 | 1994-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-17 | 1998-05-19 | 1998-11-18 | $7700.00 | Window Closed / Lapsed |