US3767934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fault responsive switching system
Assignee: Exxon Mobil Corp
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Filing: 1971-06-16
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Granted: 1973-10-23
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Expires: 1991-06-16
Abstract
Abstract Disclosed is a fault responsive switching system adapted to transfer a load from a preferred source to an emergency source upon the occurrence of a source fault or loss of voltage, retransfer the load from the emergency source to the preferred source after correction of the fault, and to isolate the load upon the occurrence of a load fault. The switching is effected by a control network responsive to loss of voltage from the respective sources, and includes relay circuitry effective to actuate solenoids coupled to a pair of switches coupling the load to the respective sources.
Inventors
- 👤 R Butcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:18
CPC Classifications
H; H02; H02J; H02J9/00; H02J9/04; H02J9/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
200 words
An electrical transmission system, comprising: a. first and second sources of electricity, b. first and second loads, c. a critical load disconnectably coupled to said first and second loads, d. said first and second sources respectively providing electrical power to said first and second loads, and also providing the preferred and emergency source of electrical power to said critical load, and e. means for selectively switching said critical load from connection with said preferred source to connection with said emergency source when a fault occurs at said preferred source, said switching means also switching said critical load from connection from both the preferred source and the emergency source when a fault occurs at said critical load to thereby isolate said critical load from said first and second sources and said first and second loads, said first and second sources providing electrical power to said first and second plurality of loads during said isolation, said switching means effecting said isolation of said critical load by initially switching said critical load from connection with said preferred source to connection with said emergency source in response to said critical load fault and thereafter switching said ciritcal load from connection with said emergency source.
Claim 2
Dependent Claim
200 words
An electrical transmission system, comprising: a. first and second sources of electricity, b. first and second loads, c. a critical load disconnectably coupled to said first and second loads, d. said first and second sources respectively providing electrical power to said first and second loads, and also providing the preferred and emergency source of electrical power to said critical load, and e. means for selectively switching said critical load from connection with said preferred source to connection with said emergency source when a fault occurs at said preferred source, said switching means also switching said critical load from connection from both the preferred source and the emergency source when a fault occurs at said critical load to thereby isolate said critical load from said first and second sources and said first and second loads, said first and second sources providing electrical power to said first and second plurality of loads during said isolation, said switching means effecting said isolation of said critical load by initially switching said critical load from connection with said preferred source to connection with said emergency source in response to said critical load fault and thereafter switching said ciritcal load from connection with said emergency source.
Claim 3
Dependent Claim
163 words
An automatic switching system to be incorporated in an electrical power distribution system of the type including a preferred source, an emergency source, and a load, said switching system comprising: a. switch means for alternatively coupling said load between said preferred source and said emergency source; b. control means responsive to a loss of voltage from said preferred source to actuate said switch means to automatically uncouple said load from said preferred source and transfer said load to said emergency source, said control means also being responsive to restoration of voltage from said preferred source to automatically uncouple said load from said emergency source and retransfer said load to said preferred source, and also being responsive to a fault in said load to uncouple said load from both the preferred and emergency source; and c. means coupled to said control means and said preferred and emergency source for actuating said control means solely in response to a loss of voltage from said sources.
Claim 4
Dependent Claim
163 words
An automatic switching system to be incorporated in an electrical power distribution system of the type including a preferred source, an emergency source, and a load, said switching system comprising: a. switch means for alternatively coupling said load between said preferred source and said emergency source; b. control means responsive to a loss of voltage from said preferred source to actuate said switch means to automatically uncouple said load from said preferred source and transfer said load to said emergency source, said control means also being responsive to restoration of voltage from said preferred source to automatically uncouple said load from said emergency source and retransfer said load to said preferred source, and also being responsive to a fault in said load to uncouple said load from both the preferred and emergency source; and c. means coupled to said control means and said preferred and emergency source for actuating said control means solely in response to a loss of voltage from said sources.
Claim 5
Dependent Claim
43 words
The system as defined by claim 2 wherein said switch means comprises a pair of switches respectively coupled between said preferred and emergency sources, and wherein said control means comprises a pair of solenoids respectively coupled to said switches for operating said switches.
Claim 6
Dependent Claim
40 words
The system as defined by claim 3 wherein said control means includes a relay network for selectively energizing said solenoids, and further including a lockout network for preventing the retransfer of said load during the presence of a load fault.
Claim 7
Dependent Claim
17 words
The system as defined by claim 4 wherein said pair of switches are load break oil switches.
Claim 8
Dependent Claim
191 words
Electrical switching system for an electrical power distribution system of the type including a preferred source, an emergency source, and a load, said switching system comprising: a. first and second circuit breakers respectively coupled to said preferred and emergency sources, b. first and second switches respectively coupled between said first and second circuit breakers and said load, and c. control means having a pair of inputs and a pair of outputs, said inputs respectively coupled to said first and second circuit breakers by way of first and second voltage transformers, respectively; said pair of outputs being respectively coupled to said first and second switches, d. said control means being responsive to a loss of voltage from said preferred source sensed by said first voltage transformer to open said first switch and close said second switch, thereby to transfer said load from said preferred source to said emergency source, e. said control means also being responsive, in conjunction with said first and second circuit breakers, to open said first and second switches in response to a fault in said load, thereby to isolate said load from both the preferred and emergency sources.
Claim 9
Dependent Claim
191 words
Electrical switching system for an electrical power distribution system of the type including a preferred source, an emergency source, and a load, said switching system comprising: a. first and second circuit breakers respectively coupled to said preferred and emergency sources, b. first and second switches respectively coupled between said first and second circuit breakers and said load, and c. control means having a pair of inputs and a pair of outputs, said inputs respectively coupled to said first and second circuit breakers by way of first and second voltage transformers, respectively; said pair of outputs being respectively coupled to said first and second switches, d. said control means being responsive to a loss of voltage from said preferred source sensed by said first voltage transformer to open said first switch and close said second switch, thereby to transfer said load from said preferred source to said emergency source, e. said control means also being responsive, in conjunction with said first and second circuit breakers, to open said first and second switches in response to a fault in said load, thereby to isolate said load from both the preferred and emergency sources.
References Cited (Backward Citations)
US2690485A
Cited
US3317741A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |