US3579043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reverse power relay
Assignee: Allis Chalmers Corp
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Filing: 1968-11-15
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Granted: 1971-05-18
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Expires: 1988-11-15
Abstract
Abstract A reverse power relay using semiconductor components is provided to sense the phase relationship between current and voltage in an electric circuit and to trip a circuit breaker controlling that circuit in the event of reverse power conditions. The reverse power relay comprises an amplifier and current multivibrator circuit, an amplifier and potential multivibrator circuit, a comparator circuit, and a timing and output circuit. Current and voltage condition signals from the two multivibrator circuit are compared in the comparator circuit and, if a reverse power condition exists, an output signal from the timing and output circuit operates a trip coil which trips the circuit breaker. The reverse power relay is powered from the same power supply as a known type of overcurrent trip device.
Inventors
- 👤 Charles P Goeller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:01
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/003; H02H1/00; H02H1/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
173 words
In a solid-state reverse power relay for controlling the trip coil of an electric circuit breaker in a multiphase electrical power circuit: first means for sensing current conditions in said power circuit and for providing a first output signal related thereto, second means for sensing potential conditions in said power circuit and for providing a second output signal related thereto, third means for comparing said first and second output signals and for providing a third output signal in the event power reversal occurs in said power circuit, fourth means for effecting operation of said trip coil after a predetermined delay in response to occurrence of said third output signal, first power supply means for operating said relay and for energizing said trip coil in response to said fourth means, and second power supply means, including capacitor means adapted to be charged by said first power supply means, for operating said relay and for energizing said trip coil in response to said fourth means in the event said first power supply means is inoperative.
Claim 2
Dependent Claim
173 words
In a solid-state reverse power relay for controlling the trip coil of an electric circuit breaker in a multiphase electrical power circuit: first means for sensing current conditions in said power circuit and for providing a first output signal related thereto, second means for sensing potential conditions in said power circuit and for providing a second output signal related thereto, third means for comparing said first and second output signals and for providing a third output signal in the event power reversal occurs in said power circuit, fourth means for effecting operation of said trip coil after a predetermined delay in response to occurrence of said third output signal, first power supply means for operating said relay and for energizing said trip coil in response to said fourth means, and second power supply means, including capacitor means adapted to be charged by said first power supply means, for operating said relay and for energizing said trip coil in response to said fourth means in the event said first power supply means is inoperative.
Claim 3
Dependent Claim
244 words
In a system comprising a multiphase electrical circuit, a circuit breaker for controlling said circuit in response to operation of a trip coil, and an overcurrent trip device for effecting operation of said trip coil, said overcurrent trip device also providing a normal source of operating power from said circuit for itself and for said trip coil: a solid-state reverse power relay for effecting operation of said trip coil in the event of reverse power conditions in said circuit, said reverse power relay receiving its operating power from said overcurrent trip device and comprising: first means comprising a multivibrator circuit for sensing current conditions in said power circuit and for providing a first output signal related thereto, second means comprising a multivibrator circuit for sensing potential conditions in said power circuit and for providing a second output signal related thereto, third means comprising a Schmitt trigger circuit for comparing said first and second output signals and for providing a third output signal in the event power reversal occurs in said power circuit, fourth means comprising a controlled rectifier for effecting operation of said trip coil after a predetermined delay in response to occurrence of said third output signal, and emergency power supply means for energizing the reverse power relay and the trip coil in the event said normal power supply means is inoperative, said emergency power supply means including capacitor means adapted to be charged by the operating power from said overcurrent trip device.
Claim 4
Dependent Claim
244 words
In a system comprising a multiphase electrical circuit, a circuit breaker for controlling said circuit in response to operation of a trip coil, and an overcurrent trip device for effecting operation of said trip coil, said overcurrent trip device also providing a normal source of operating power from said circuit for itself and for said trip coil: a solid-state reverse power relay for effecting operation of said trip coil in the event of reverse power conditions in said circuit, said reverse power relay receiving its operating power from said overcurrent trip device and comprising: first means comprising a multivibrator circuit for sensing current conditions in said power circuit and for providing a first output signal related thereto, second means comprising a multivibrator circuit for sensing potential conditions in said power circuit and for providing a second output signal related thereto, third means comprising a Schmitt trigger circuit for comparing said first and second output signals and for providing a third output signal in the event power reversal occurs in said power circuit, fourth means comprising a controlled rectifier for effecting operation of said trip coil after a predetermined delay in response to occurrence of said third output signal, and emergency power supply means for energizing the reverse power relay and the trip coil in the event said normal power supply means is inoperative, said emergency power supply means including capacitor means adapted to be charged by the operating power from said overcurrent trip device.
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |