US4207445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
On-load tap changer switch assembly
Assignee: ABB Norden Holding AB
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Filing: 1977-10-25
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Granted: 1980-06-10
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Expires: 1997-10-25
Abstract
Abstract In an on-load tap changer comprising a step selector operated by two shafts which are rotatable with respect to each other, a damping switch for temporarily switching in a damping resistor during a plus/minus or a coarse/fine switching operation is operated by a cam member fixedly mounted on one of the two shafts.
Inventors
- 👤 Karl E. Hammar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:16
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/0005; H01H3/00; H01H3/32; H01H3/44
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
171 words
On-load tap changer for a transformer having a base winding and a regulating winding, comprising: a diverter switch having at least two fixed contacts; a step selector having a plurality of fixed contacts connected to taps on said regulating winding and cooperating with two movable contacts, said movable contacts being mounted on two rotatable drive shafts and connected to the fixed contacts of said diverter switch; a drive mechanism connected to the drive shafts of said step selector for rotating the shafts in steps relative to each other; a plus/minus or coarse/fine switch connecting said regulating winding to said base winding; and a damping switch for temporarily during a plus/minus or a coarse/fine switching operation connecting said regulating winding through a damping resistor to a point of defined potential, said damping switch having cooperating fixed and movable contacts and comprising operating means including a cam member, said cam member being fixedly mounted on one of the drive shafts of said step selector and operatively connected to said movable damping switch contacts.
Claim 2
Dependent Claim
171 words
On-load tap changer for a transformer having a base winding and a regulating winding, comprising: a diverter switch having at least two fixed contacts; a step selector having a plurality of fixed contacts connected to taps on said regulating winding and cooperating with two movable contacts, said movable contacts being mounted on two rotatable drive shafts and connected to the fixed contacts of said diverter switch; a drive mechanism connected to the drive shafts of said step selector for rotating the shafts in steps relative to each other; a plus/minus or coarse/fine switch connecting said regulating winding to said base winding; and a damping switch for temporarily during a plus/minus or a coarse/fine switching operation connecting said regulating winding through a damping resistor to a point of defined potential, said damping switch having cooperating fixed and movable contacts and comprising operating means including a cam member, said cam member being fixedly mounted on one of the drive shafts of said step selector and operatively connected to said movable damping switch contacts.
Claim 3
Dependent Claim
58 words
On-load tap changer according to claim 1, wherein said movable contacts of said damping switch are supported by a contact holder rotatably journalled on one of said drive shafts, said contact holder being connected to said cam member through a guiding arm, and said cam member including a disc with a cam slot for engaging said guiding arm.
Claim 4
Dependent Claim
49 words
On-load tap changer according to claim 2, wherein said guiding arm is rotatably journalled at a radial distance from said one drive shaft and includes two guiding pins, one of said guiding pins cooperating with said cam member and the other of said guiding pins engaging said contact holder.
References Cited (Backward Citations)
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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) | 1983-06-10 | 1983-12-10 | 1984-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-10 | 1987-12-10 | 1988-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-10 | 1991-12-10 | 1992-06-10 | $7700.00 | Window Closed / Lapsed |