Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1980-04-15
1983-03-22
Moose, Jr., HarryE.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
H02H 504
Patent
active
043778372
ABSTRACT:
A circuit interrupter includes a circuit breaker mechanism having a trip coil energized by a current transformer to separate the contacts upon command of a microcomputer-based trip unit during overcurrent conditions. A bimetallic normally-open thermal switch is mounted on the internal conductors of the breaker and is connected in parallel with the trip unit to energize the trip coil when the conductors overheat. The thermal switch is also connected to the interrupt terminal of the microcomputer to cause appropriate display and alarm information upon activation of the thermal switch.
REFERENCES:
patent: 3026396 (1962-03-01), Fisher
patent: 3818275 (1974-06-01), Shimp
patent: 3956670 (1976-05-01), Shimp et al.
patent: 4067052 (1978-01-01), Neuhoff
"A Microprocessor Oriented Data Acquisition and Control System for Power System Control"-Mulder et al.,-3rd Annual Symposium on Computer Architecture-Clearwater, Fla., Jan 19-21, 1976.
"Results of Field Experiments of Digital Relays Utilizing Minicomputer and Microprocessor", Suzaki et al., IFAC Conference on automatic Control and Protection of Electrical Power Systems, 2/77.
"Motor Protective Relay IC305 MLTA", Descriptive Bulletin, General Electric, 12/78.
"Micro Versa Trip Programmer", G. C. Eckart, Industrial Power Systems, 6/79.
"Operating and Instruction Guide," Matco Energy Moniter.
Matsko Joseph J.
Wafer John A.
Converse, Jr. Robert E.
Moose, Jr. HarryE.
Westinghouse Electric Corp.
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