# Problem 6 (15 points) In a thermocouple, the combination of two dissimilar materials (A and B)...

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Problem 6 (15 points) In a thermocouple, the combination of two dissimilar materials (A and B) is used, the Seebeck potential is determined from a differential Seebeck coefficient α48 ar, The net voltage of the Junction is dl.,-«, dT and Bu is the differential coefficient. The voltage as a function of a temperature gradient for a K-type thermocouple with a high degree of accuracy can be approximated by a second order equation: v,,-4+a,T+a,T2-0.0 + 39.35T + 1.72*10"r' where v," is in μν. Find the Seebeck voltage when the voltage gradient is 100 C. For the case where the thermocouple is to measure the top oil temperature of a transformer and the themocouple is brought out to the transformer control cabinet which is at an ambient temperature of 40 degrees C Find the alarm voltage if you wish to alarm when the top oil temperature is 1050. Determine a simple circuit model for the above themocouple. (Assume a negligible internal resistance relative to the voltmeter

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