Thermal measuring and testing – Temperature measurement – Combined with diverse art device
Patent
1997-11-21
2000-07-11
Gibson, Randy W.
Thermal measuring and testing
Temperature measurement
Combined with diverse art device
374188, 374197, 374201, G01K 108, G01K 500
Patent
active
060862491
ABSTRACT:
The invention concerns a method to reproduce and display the winding temperature of an electric power transformer by deriving the measured and displayed temperature from the temperature of the coolant cooling the power transformer and the temperature of an electric heater fed with a current proportional to the load of the power transformer. A thermometer system is used for measuring the temperature and comprises of a hollow sensor element (7) and a mechanical transducer (2) connected through a capillary tube (6) with said element (7) to actuate a mechanical display and comprising several switches, the mutually connected cavities of sensor element (7), capillary tube (6) and transducer (2) subtending a closed pressure chamber filled with a test medium of which the pressure changes in relation to pressure. The temperature of the power transformer coolant is directly measured by the sensor element (7) and, by directly heating--separately from the measurement of the coolant temperature--the test medium using the electrical heater immersed into the test medium, an additional test pressure is generated that corresponds to the power-transformer's winding temperature. The electrical heater is mounted in an insulated heating chamber (10) which preferably is connected through a capillary tube (9) to the pressure chamber of the sensor element (7) and transducer (2).
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