US4081741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
On-load tap changer
Assignee: ABB Norden Holding AB
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Filing: 1976-10-26
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Granted: 1978-03-28
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Expires: 1996-10-26
Abstract
Abstract On-load tap changer apparatus of the type having two connection branches, each of which is connected between a common connection point and a separate movable contact, at least one branch having a resistor in series with the first contact device, and the other branch including a vacuum element with a second contact device connected in parallel with the vacuum element in the second connection branch. Alternatively, the contacts of a change-over switch are connected to the two connection branches and a vacuum element is connected between the contacts of the change-over switch.
Inventors
- 👤 Peter Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:24
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/0005; H01F; H01F29/00; H01F29/02; H01F29/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
89 words
On-load tap-changer apparatus comprising two connection branches, each of said branches connected between a common connection point and a separate movable contact, one branch comprising a resistor in series with a first contact device and the other branch containing a vacuum element, each of said movable contacts being movable in succession between a number of fixed contacts intended for connection to the tappings of a regulating transformer, said second connection branch including a second contact device, said second contact device being connected directly in parallel with said vacuum element.
Claim 2
Dependent Claim
89 words
On-load tap-changer apparatus comprising two connection branches, each of said branches connected between a common connection point and a separate movable contact, one branch comprising a resistor in series with a first contact device and the other branch containing a vacuum element, each of said movable contacts being movable in succession between a number of fixed contacts intended for connection to the tappings of a regulating transformer, said second connection branch including a second contact device, said second contact device being connected directly in parallel with said vacuum element.
Claim 3
Dependent Claim
102 words
On-load multi-phase tap changer apparatus comprising only a single vacuum element per phase and provided with two connection branches connected respectively between each of two contacts of a changeover switch, said contacts being connectible to an external line connection and between each one of two movable selector contacts which are movable in succession between a number of fixed tap contacts adapted to be connected to the tappings of a regulating transformer, each connection branch containing one contact device being adapted to be connected in parallel with a bridging resistor, and said vacuum element being connected between said contacts of said change-over switch.
Claim 4
Dependent Claim
102 words
On-load multi-phase tap changer apparatus comprising only a single vacuum element per phase and provided with two connection branches connected respectively between each of two contacts of a changeover switch, said contacts being connectible to an external line connection and between each one of two movable selector contacts which are movable in succession between a number of fixed tap contacts adapted to be connected to the tappings of a regulating transformer, each connection branch containing one contact device being adapted to be connected in parallel with a bridging resistor, and said vacuum element being connected between said contacts of said change-over switch.
Claim 5
Dependent Claim
23 words
Tap changer apparatus as in claim 2, wherein said vacuum element being closed only upon the switching-over from one tap contact to another.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-27 | 1981-09-26 | 1982-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-27 | 1985-09-26 | 1986-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-27 | 1989-09-26 | 1990-03-28 | $7700.00 | Window Closed / Lapsed |