Patent US3777215A successfully refreshed from Google Patents.
US3777215A
Expired / Lapsed
US
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Breaker failure relay device
Assignee: ABB Inc USA
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Filing: 1972-06-02
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Granted: 1973-12-04
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Expires: 1992-06-02
Abstract
Abstract A device for sensing the failure of a principal breaker to interrupt the flow of fault current therethrough which is unaffected by the magnitude of the fault current to be interrupted.
Inventors
- 👤 Esopo C D
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:42
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/02; H02H3/05; H02H7/00; H02H7/26; H02H7/30
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
266 words
A protective relaying apparatus for an electrically energized power circuit connected to a power supply through circuit breaker contacts, said apparatus comprising a first circuit energizable with an analog output quantity having a magnitude determinable by the magnitude of current flowing through said breaker contacts, a fault detector having an input circuit connected to said first circuit whereby said detector is energized by said analog output quantity, said detector also having an output circuit, said output circuit being actuated when the energization of said input circuit indicates a faulted condition of the power circuit being protected by said breaker contacts, a timer connected to said output circuit and effective to time out a predetermined time interval subsequent to its actuation by said output circuit, a switching device having first and second operating conditions and connected to said timer for actuation from its said first to its said second conditions at the end of its said time interval, an analog electrical quantity magnitude sensing device for sensing the level of said analog output quantity, said sensing device having an input and output, circuit means connecting said input of said sensing device to said first circuit and including said switching device, said switching device normally being maintained in a first condition to prevent energization of said magnitude sensing device and having a second condition in which said sensing device is energized by said analog output quantity to determine the presence and absence of a minimum magnitude of said analog output quantity solely subsequent to the timing out of said timer and the actuation of said switching device thereby.
Claim 2
Dependent Claim
266 words
A protective relaying apparatus for an electrically energized power circuit connected to a power supply through circuit breaker contacts, said apparatus comprising a first circuit energizable with an analog output quantity having a magnitude determinable by the magnitude of current flowing through said breaker contacts, a fault detector having an input circuit connected to said first circuit whereby said detector is energized by said analog output quantity, said detector also having an output circuit, said output circuit being actuated when the energization of said input circuit indicates a faulted condition of the power circuit being protected by said breaker contacts, a timer connected to said output circuit and effective to time out a predetermined time interval subsequent to its actuation by said output circuit, a switching device having first and second operating conditions and connected to said timer for actuation from its said first to its said second conditions at the end of its said time interval, an analog electrical quantity magnitude sensing device for sensing the level of said analog output quantity, said sensing device having an input and output, circuit means connecting said input of said sensing device to said first circuit and including said switching device, said switching device normally being maintained in a first condition to prevent energization of said magnitude sensing device and having a second condition in which said sensing device is energized by said analog output quantity to determine the presence and absence of a minimum magnitude of said analog output quantity solely subsequent to the timing out of said timer and the actuation of said switching device thereby.
Claim 3
Dependent Claim
173 words
A breaker failure apparatus for energizing a back-up breaker upon the failure of the principal breaker to interrupt the flow of fault current, said apparatus comprising a timer having an input connected for actuation substantially concurrently with the energization of said principal breaker, said timer being operable to time out a predetermined interval when actuated, a fault current sensing circuit having an analog output quantity the magnitude of which varies as an analog of the magnitude of said fault current flowing through said principal breaker, an analog quantity measuring device, circuit means effective to couple said measuring device with said sensing circuit for rendering said device responsive to measure the magnitude of said analog output quantity, means coupling said circuit means to said timer and effective to render said circuit means effective to couple said measuring device to said sensing circuit solely subsequent to the timing out of said predetermined interval by said timer, said measuring device being responsive to a predetermined minimum value of said analog quantity to actuate said back-up breaker.
Claim 4
Dependent Claim
173 words
A breaker failure apparatus for energizing a back-up breaker upon the failure of the principal breaker to interrupt the flow of fault current, said apparatus comprising a timer having an input connected for actuation substantially concurrently with the energization of said principal breaker, said timer being operable to time out a predetermined interval when actuated, a fault current sensing circuit having an analog output quantity the magnitude of which varies as an analog of the magnitude of said fault current flowing through said principal breaker, an analog quantity measuring device, circuit means effective to couple said measuring device with said sensing circuit for rendering said device responsive to measure the magnitude of said analog output quantity, means coupling said circuit means to said timer and effective to render said circuit means effective to couple said measuring device to said sensing circuit solely subsequent to the timing out of said predetermined interval by said timer, said measuring device being responsive to a predetermined minimum value of said analog quantity to actuate said back-up breaker.
Claim 5
Dependent Claim
33 words
The combination of claim 2 in which said circuit means include a normally open switching device which is actuated to circuit closed condition as a consequence of the timing out of said timer.
Claim 6
Dependent Claim
32 words
The combination of claim 3 in which sensing circuit is energized with energy derived from a current transformer having its primary winding in series circuit with the circuit through said primary breaker.
Claim 7
Dependent Claim
47 words
The combination of claim 4 which includes a fault detector energized at least in part by said current transformer, said fault detector having an output connected to actuate said primary breaker upon the occurrence of a fault in the power line being protected by said principal breaker.
Claim 8
Dependent Claim
160 words
In a breaker failure apparatus, an energizable principal breaker tripping circuit, said tripping circuit being operable when energized to actuate a principal breaker to open circuit condition, an analog quantity sensing device including reactive elements, a fault current sensing circuit having an analog output quantity determined by the magnitude of the current flowing through said principal breaker, circuit means including a switching device for connecting said current sensing circuit to said reactive elements, said switching device having first and second operating conditions, said switching device being normally in its said first condition to prevent the energization of said reactive elements by said analog output quantity, and timing means interconnecting said tripping circuit and said switching device, said timing means being effective subsequent to a predetermined minimum time interval after the energization of said tripping circuit to actuate said switching device to its said second operating condition to render said elements energized by said analog output quantity of said sensing circuit.
Claim 9
Dependent Claim
160 words
In a breaker failure apparatus, an energizable principal breaker tripping circuit, said tripping circuit being operable when energized to actuate a principal breaker to open circuit condition, an analog quantity sensing device including reactive elements, a fault current sensing circuit having an analog output quantity determined by the magnitude of the current flowing through said principal breaker, circuit means including a switching device for connecting said current sensing circuit to said reactive elements, said switching device having first and second operating conditions, said switching device being normally in its said first condition to prevent the energization of said reactive elements by said analog output quantity, and timing means interconnecting said tripping circuit and said switching device, said timing means being effective subsequent to a predetermined minimum time interval after the energization of said tripping circuit to actuate said switching device to its said second operating condition to render said elements energized by said analog output quantity of said sensing circuit.
References Cited (Backward Citations)
US3144585A
Cited
US3259802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |