US3636489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transformer having an externally operable no-load tap changer
Assignee: Westinghouse Electric Corp
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Filing: 1970-11-17
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Granted: 1972-01-18
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Expires: 1990-11-17
Abstract
Abstract A distribution transformer having a metallic casing comprising a fluid compartment and a terminal compartment separated by a common wall. Core-winding means including a low-voltage coil and a high-voltage coil having a plurality of taps thereon located in the fluid dielectric compartment. A tap changer attached to the fluid dielectric compartment side of the common wall. The tap changer has a shaft extending through the common wall with an Oring seal to prevent fluid dielectric from seeping into the terminal compartment. An operating member is attached to the shaft and located in the terminal compartment for operating the shaft to move a movable contact member to engage fixed contacts located inside the fluid dielectric compartment to selectively connect the taps on the high-voltage coil to the casing. An indicator is located in the terminal compartment to indicate which terminal in the fluid dielectric compartment is connected to the movable contact element.
Inventors
- 👤 Don L Colangelo
- 👤 Robert J Manes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:47
CPC Classifications
H; H01; H01F; H01F29/00; H01F29/02; H01F29/025; H01F27/00; H01F27/02; H01F27/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
221 words
A transformer casing comprising a fluidtight compartment and a terminal compartment, said fluidtight compartment and said terminal compartment having a common wall, said casing being constructed of electrically conductive material, core-winding means positioned in said fluidtight compartment, said winding means comprising; a high-voltage coil and a low-voltage coil, said high-voltage coil having an input terminal and a plurality of taps, fluid dielectric filling said fluidtight compartment to a predetermined height to cover said core-winding assembly, tapchanging means mounted on said common wall between said fluidtight compartment and said terminal compartment, said tapchanging means comprising a shaft extending through said common wall above the level of said fluid dielectric and having an operating member extending into said terminal compartment and accessible in said terminal compartment to operate said tapchanging means, said tap-changing means comprising fixed contact means extending into said fluidtight compartment and positioned below the level of said fluid dielectric, means connecting said fixed contact means to said taps on said high-voltage coil, a movable contact member connected to said operating member by said shaft extending through said common wall, said movable contact member being operable by said operating member in said terminal compartment to selectively electrically connect each of said taps on said high-voltage coil through said fixed contacts to said casing, and means connecting said casing to ground potential.
Claim 2
Dependent Claim
221 words
A transformer casing comprising a fluidtight compartment and a terminal compartment, said fluidtight compartment and said terminal compartment having a common wall, said casing being constructed of electrically conductive material, core-winding means positioned in said fluidtight compartment, said winding means comprising; a high-voltage coil and a low-voltage coil, said high-voltage coil having an input terminal and a plurality of taps, fluid dielectric filling said fluidtight compartment to a predetermined height to cover said core-winding assembly, tapchanging means mounted on said common wall between said fluidtight compartment and said terminal compartment, said tapchanging means comprising a shaft extending through said common wall above the level of said fluid dielectric and having an operating member extending into said terminal compartment and accessible in said terminal compartment to operate said tapchanging means, said tap-changing means comprising fixed contact means extending into said fluidtight compartment and positioned below the level of said fluid dielectric, means connecting said fixed contact means to said taps on said high-voltage coil, a movable contact member connected to said operating member by said shaft extending through said common wall, said movable contact member being operable by said operating member in said terminal compartment to selectively electrically connect each of said taps on said high-voltage coil through said fixed contacts to said casing, and means connecting said casing to ground potential.
Claim 3
Dependent Claim
81 words
Apparatus as specified in claim 1 wherein said fixed contact means comprises a plurality of electrical contacts in spaced relation on an insulating member, electrical conducting means attached to said insulating member and to the common wall between said fluidtight compartment and said terminal compartment for supporting said tap-changing means, and said movable contact means making electrical connections with said metallic support means to provide a current conducting path from said fixed contact through said support means to said fluidtight casing.
Claim 4
Dependent Claim
44 words
Apparatus as specified in claim 1 wherein said shaft extending through said common wall between said fluidtight compartment and said terminal compartment is sealed with an O-ring to prevent fluid dielectric from traveling up said shaft and through said wall into said terminal compartment.
Claim 5
Dependent Claim
78 words
Apparatus as specified in claim 2 wherein first and second coil springs surrounds said shaft to provide force to maintain said movable contact in good contact making relationship with said fixed contacts, said first spring being located in the main current path between said movable contact and said metal support, and said second spring being spaced from said first spring and remote from the current path from said movable contact through said metal support to said metallic casing.
Claim 6
Dependent Claim
52 words
The apparatus of claim 4 wherein said first coil spring is shunted by a current-conducting member, said current-conducting member making good contact with the shaft carrying said movable contact and with said metallic support member so as to carry most of the current around said first spring to said fixed metallic support.
Claim 7
Dependent Claim
49 words
The apparatus of claim 1 wherein said tap-changing means is supported from the common wall between said fluidtight compartment and said terminal compartment by means of a U-shaped bracket which is in the current-carrying path between said movable contact means and said stationary contact means and said metallic casing.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |