Thermal measuring and testing – Temperature measurement – By electrical or magnetic heat sensor
Patent
1983-03-30
1984-09-11
Frankfort, Charles
Thermal measuring and testing
Temperature measurement
By electrical or magnetic heat sensor
324 51, 374163, G01R 3102
Patent
active
044707118
ABSTRACT:
Temperature indicating apparatus for sensing overheating at a pair of terminals on an electrical power line comprises a pair of thermocouples, each thermally coupled to and electrically isolated from a different one of the terminals, and a light emitting diode (LED) coupled to the output of the thermocouples through a conditioning circuit. An excessive temperature rise at either terminal causes the output voltage of the thermocouple coupled thereto to increase, thus causing the LED +o to be lit and to provide a visual indication of overheating. A meter display may be provided to show the actual temperature of the terminals in response to thermocouple voltage output. A method for determining heating at a termination without physical intervention comprises determining the rate of temperature rise of the termination for a known current therethrough and comparing the rate to a predetermined rate threshold.
REFERENCES:
patent: 3232794 (1966-02-01), Korton
patent: 3513432 (1970-05-01), Davis
patent: 3851243 (1974-11-01), Banner
patent: 3978729 (1976-09-01), Jacobs
patent: 4062006 (1977-12-01), Solheim et al.
patent: 4117723 (1978-10-01), Maravich
patent: 4310837 (1982-01-01), Kornrumpf et al.
"Precision Fine Wire Thermocouples", Omega Engineering, Inc., Jul. 28, 1966.
Ceramo, Thermo-Electric Co., Inc., 1965.
Checkovich Paul J.
Davis Jr. James C.
Frankfort Charles
General Electric Company
Lacomis Bernard J.
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