Patent US3633072A successfully refreshed from Google Patents.
US3633072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase detection circuit
Assignee: Individual
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Filing: 1970-02-24
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Granted: 1972-01-04
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Expires: 1990-02-24
Abstract
Abstract Apparatus for detecting the phase relationship and potential difference between the phases of a polyphase electrical circuit and for interrupting the circuit if a shift in phase or a decrease in potential difference occurs beyond acceptable limits. The current-passing terminals of a controlled switching device such as a silicon controlled rectifier are coupled in series with a control device across two phases of the polyphase circuit, while the control electrode such as the gate of the silicon controlled rectifier is coupled to a third phase. So long as the proper phase relationship and potential difference are maintained, current through the circuit is sufficient to maintain the control device in a first state. Should a phase shift or a decrease in potential difference, or a combination thereof, in excess of the allowable limits occur, current through the circuit is insufficient to maintain the control device in that first state, and the power applied from the polyphase source to its load is interrupted.
Inventors
- 👤 Lawrence N Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:08
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/26; H02H3/32; H02H3/34; H02H3/353
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
358 words
An electrical circuit detecting phase relationship and potential differences including: a. a three-phase electrical source; b. a three-phase electrical load; c. a first, second and third electrical conductor, each conductor with respect to the other conductors carrying a leading phase, an intermediate phase and a trailing phase; d. a circuit breaker for each conductor, the improvement comprising: e. a circuit breaker controller circuit, said circuit breakers being responsive to a current in said controller circuit to close said breakers and responsive to an open circuit to open said breakers; f. three detection circuits, each with an input line, an output line and a controller line; g. three current means serially connected in said controller circuit each responsive to current between the input and output lines of a detection circuit to close the controller circuit and responsive to an open circuit in said detection circuit to open said controller circuit; h. the output line of each detection circuit connected to a different electrical conductor with respect to each other detection circuit, said conductor being the leading phase conductor for said detection circuit; i. the input line for each detection circuit connected to a different electrical conductor with respect to each other detection circuit, said conductor being the trailing phase with respect to the conductor which is connected to the output line; j. the controller line of each detection circuit connected to the third conductor, said conductor being with respect to the other conductors the intermediate phase conductor; k. in each detection circuit said controller line having a switching means allowing undirectional current flow from said conductor into each detection circuit; l. a controlled switching means having an input terminal connected to said input line, an output terminal connected to said output line and a controller terminal connected to said controller line. m. said controlled switching means normally open and closing to allow undirectional current flow when said input line is at a higher potential than said output line and said controller line is at a higher potential than said output line and remaining closed so long as said input line remains at a higher potential than said outpUt line.
Claim 2
Dependent Claim
358 words
An electrical circuit detecting phase relationship and potential differences including: a. a three-phase electrical source; b. a three-phase electrical load; c. a first, second and third electrical conductor, each conductor with respect to the other conductors carrying a leading phase, an intermediate phase and a trailing phase; d. a circuit breaker for each conductor, the improvement comprising: e. a circuit breaker controller circuit, said circuit breakers being responsive to a current in said controller circuit to close said breakers and responsive to an open circuit to open said breakers; f. three detection circuits, each with an input line, an output line and a controller line; g. three current means serially connected in said controller circuit each responsive to current between the input and output lines of a detection circuit to close the controller circuit and responsive to an open circuit in said detection circuit to open said controller circuit; h. the output line of each detection circuit connected to a different electrical conductor with respect to each other detection circuit, said conductor being the leading phase conductor for said detection circuit; i. the input line for each detection circuit connected to a different electrical conductor with respect to each other detection circuit, said conductor being the trailing phase with respect to the conductor which is connected to the output line; j. the controller line of each detection circuit connected to the third conductor, said conductor being with respect to the other conductors the intermediate phase conductor; k. in each detection circuit said controller line having a switching means allowing undirectional current flow from said conductor into each detection circuit; l. a controlled switching means having an input terminal connected to said input line, an output terminal connected to said output line and a controller terminal connected to said controller line. m. said controlled switching means normally open and closing to allow undirectional current flow when said input line is at a higher potential than said output line and said controller line is at a higher potential than said output line and remaining closed so long as said input line remains at a higher potential than said outpUt line.
References Cited (Backward Citations)
US3431467A
Cited
US3495130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |