Patent US3783206A successfully refreshed from Google Patents.
US3783206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tap changing apparatus with improved contact structure to eliminate electrical fields across open interrupter switches
Assignee: ABB Inc USA
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Filing: 1972-07-06
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Granted: 1974-01-01
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Expires: 1992-07-06
Abstract
Abstract Apparatus for providing load tap changes having means for protecting the current interrupting switches from winding surge voltages. Current interrupting switches are connected to stationary contacts of a load transfer switch. Movable contacts of the load transfer switch rotate during a tap change to shunt the open and closed current interrupting switches and to eliminate the electrical fields across open current interrupting switches upon completion of the tap change.
Inventors
- 👤 R Lingenfelter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:52
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/0005; H01F; H01F29/00; H01F29/02; H01F29/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
202 words
Tap changing apparatus comprising: first and second tap selecting means; first, second and third current interRupting means each having first and second terminals; means for opening and closing said first, second and third current interrupting means; first, second, third, fourth and fifth stationary contacts, said first stationary contact being connected to said first tap selecting means, said fifth stationary contact being connected to said second tap selecting means, the second terminal of said second current interrupting means being connected to said second stationary contact, the second terminal of said third current interrupting means being connected to said fourth stationary contact, and the first terminals of said first, second and third current interrupting means being connected to said third stationary contact; impedance means electrically connected between said second stationary contact and the second terminal of said first current interrupting means; first, second and third movable contacts; and means for moving said first, second and third movable contacts in unison to first, second, third, fourth and fifth positions, said movable contacts connecting together appropriate stationary contacts in each position to maintain a current path between one of said tap selecting means and the first terminals of said first, second and third current interrupting means.
Claim 2
Dependent Claim
202 words
Tap changing apparatus comprising: first and second tap selecting means; first, second and third current interRupting means each having first and second terminals; means for opening and closing said first, second and third current interrupting means; first, second, third, fourth and fifth stationary contacts, said first stationary contact being connected to said first tap selecting means, said fifth stationary contact being connected to said second tap selecting means, the second terminal of said second current interrupting means being connected to said second stationary contact, the second terminal of said third current interrupting means being connected to said fourth stationary contact, and the first terminals of said first, second and third current interrupting means being connected to said third stationary contact; impedance means electrically connected between said second stationary contact and the second terminal of said first current interrupting means; first, second and third movable contacts; and means for moving said first, second and third movable contacts in unison to first, second, third, fourth and fifth positions, said movable contacts connecting together appropriate stationary contacts in each position to maintain a current path between one of said tap selecting means and the first terminals of said first, second and third current interrupting means.
Claim 3
Dependent Claim
32 words
The tap changing apparatus of claim 1 wherein the first tap selecting means moves to a different tap terminal when the movable contacts move from the fifth position to the sixth position.
Claim 4
Dependent Claim
73 words
The tap changing apparatus of claim 2 wherein, when the movable contacts are in the first position, the first movable contact electrically connects together the first and second stationary contacts, the second movable contact electrically connects together the second and third stationary contacts, the third movable contact electrically connects together the third and fourth stationary contacts, the first and second current interrupting means are closed, and the third current interrupting means is open.
Claim 5
Dependent Claim
60 words
The tap changing apparatus of claim 2 wherein, when the movable contacts are in the second position, the first movable contact electrically connects together the first and second stationary contacts, the third movable contact electrically connects together the fourth and fifth stationary contacts, the first and second current interrupting means are closed, and the third current interrupting means is open.
Claim 6
Dependent Claim
60 words
The tap changing apparatus of claim 2 wherein, when the movable contacts are in the third position, the first movable contact electrically connects together the first and second stationary contacts, the third movable contact electrically connects together the fourth and fifth stationary contacts, the first current interrupting means is closed, and the second and third current interrupting means are open.
Claim 7
Dependent Claim
60 words
The tap changing apparatus of claim 2 wherein, when the movable contacts are in the fourth position, the first movable contact electrically connects together the first and second stationary contacts, the third movable contact electrically connects together the foruth and fifth stationary contacts, the first and third current interrupting means are closed, and the second current interrupting means is open.
Claim 8
Dependent Claim
60 words
The tap changing apparatus of claim 2 wherein, when the movable contacts are in the fifth position, the first movable contact electrically connects together the first and second stationary contacts, the third movable contact electrically connects together the fourth and fifth stationary contacts, the first and second current interrupting means are open, and the third current interrupting means is closed.
Claim 9
Dependent Claim
73 words
The tap changing apparatus of claim 2 wherein, when the movable contacts are in the sixth position, the first movable contact electrically connects together the second and third stationary contacts, the second movable contact electrically connects together the third and fourth stationary contacts, the third movable contact electrically connects together the fourth and fifth stAtionary contacts, the first and second current interrupting means are open, and the third current interrupting means is closed.
References Cited (Backward Citations)
US3462562A
Cited
US3643154A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |