Patent US3735243A successfully refreshed from Google Patents.
US3735243A
Expired / Lapsed
US
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Control system for tap changer with vacuum interrupter
Assignee: General Electric Co
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Filing: 1972-04-03
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Granted: 1973-05-22
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Expires: 1992-04-03
Abstract
Abstract A control system for a tap changer using a vacuum interrupter. The control system has provisions for monitoring the vacuum interrupter to detect any failure of such interrupter and thus prevent further operation of the tap changer. Should the interrupter fail to open on a tap change, the tap changer motor is reversed returning the changer to the starting position and locking the changer. Should the interrupter be open at the start of a tap change, the tap changer is reversed returning the tap changer to the starting position and then locking the tap changer. In another embodiment, should the interrupter fail to close after a tap change has been initiated, the tap change is completed and the changer locked in that position.
Inventors
- 👤 C Downs
- 👤 R Blackburn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:16
CPC Classifications
H; H01; H01H; H01H9/00; H01H9/0005; H01H9/0038; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/14; G05F1/147; G05F1/153; H01F; H01F29/00; H01F29/02; H01F29/04; H01H2009/0061
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A control system for a tap changer, said tap changer including a tapped winding with a plurality of fixed tap contacts, a pair of movable contacts movable to contact said plurality of fixed contacts, a vacuum interrupter shunting said movable contacts, and a bypass switch between each movable contact and a load, said control system comprising means actuated by an external source, a logic circuit for operating said tap changer, said means electrically connected to activate said logic circuit, sensing means sensing the operating condition of said vacuum interrupter, said sensing means providing electrical signals to said logic circuit to prevent operation of said tap changer when said vacuum interrupter is inoperative.
Claim 2
Dependent Claim
112 words
A control system for a tap changer, said tap changer including a tapped winding with a plurality of fixed tap contacts, a pair of movable contacts movable to contact said plurality of fixed contacts, a vacuum interrupter shunting said movable contacts, and a bypass switch between each movable contact and a load, said control system comprising means actuated by an external source, a logic circuit for operating said tap changer, said means electrically connected to activate said logic circuit, sensing means sensing the operating condition of said vacuum interrupter, said sensing means providing electrical signals to said logic circuit to prevent operation of said tap changer when said vacuum interrupter is inoperative.
Claim 3
Dependent Claim
41 words
A control system for a tap changer as set forth in claim 1 in which said sensing means senses failure of said vacuum interrupter to open and provides a signal to said logic circuit to prevent operation of said tap changer.
Claim 4
Dependent Claim
75 words
A control system for a tap changer as set forth in claim 1 in which a signal storage and inverter circuit is provided, said sensing means electrically connected to said signal storage and inverter circuit, said sensing means providing no signal if said vacuum interrupter fails to close and said signal storage and inverter circuit providing a signal to said logic circuit to reverse said tap changer and prevent further operation of said tap changer.
Claim 5
Dependent Claim
105 words
A control system for a tap changer, said tap changer including a tapped winding with a plurality of fixed tap contacts, a pair of movable contacts movable to contact said plurality of fixed contacts, a vacuum interrupter shunting said movable contacts, and a bypass switch between each movable contact and a load, said control system comprising a logic circuit actuated by an external source to cause operation of said tap changer, sensing means sensing the operating condition of said vacuum interrupter, said sensing means providing electrical signals to actuate said logic circuit to prevent operation of said tap changer when said vacuum interrupter is inoperative.
Claim 6
Dependent Claim
105 words
A control system for a tap changer, said tap changer including a tapped winding with a plurality of fixed tap contacts, a pair of movable contacts movable to contact said plurality of fixed contacts, a vacuum interrupter shunting said movable contacts, and a bypass switch between each movable contact and a load, said control system comprising a logic circuit actuated by an external source to cause operation of said tap changer, sensing means sensing the operating condition of said vacuum interrupter, said sensing means providing electrical signals to actuate said logic circuit to prevent operation of said tap changer when said vacuum interrupter is inoperative.
Claim 7
Dependent Claim
63 words
A control system as set forth in claim 4 in which said sensing means is connected electrically to a gate, a switch operated by said vacuum interrupter, said switch operating a pulse generator to provide a gating pulse to said gate, said gate providing a failure signal to said logic circuit if said sensing means senses failure of operation of said vacuum interrupter.
Claim 8
Dependent Claim
112 words
A control system for a tap changer, said tap changer including a tapped winding with fixed tap contacts, and a pair of movable contacts, a vacuum interrupter shunting said movable contacts and a bypass switch between each movable contact and a load, said control system comprising means to sense the operation of said vacuum interrupter, a logic circuit to operate said tap changer, and means cooperating with said logic circuit to prevent operation of said tap changer when said vacuum interrupter fails, and a counter provided in said logic circuit, said counter providing a time delay and then allowing further operation of said tap changer after said logic circuit Prevents such operation.
Claim 9
Dependent Claim
112 words
A control system for a tap changer, said tap changer including a tapped winding with fixed tap contacts, and a pair of movable contacts, a vacuum interrupter shunting said movable contacts and a bypass switch between each movable contact and a load, said control system comprising means to sense the operation of said vacuum interrupter, a logic circuit to operate said tap changer, and means cooperating with said logic circuit to prevent operation of said tap changer when said vacuum interrupter fails, and a counter provided in said logic circuit, said counter providing a time delay and then allowing further operation of said tap changer after said logic circuit Prevents such operation.
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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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |