RTD Schemes (Device 49)Most large generators are equipped with resistancetemperature detectors (RTDs), which may be used in abridge circuit to provide sensing intelligence to anindicator or a relay such as the DT-3 or 49 T.This relay is restrained when the resistance is low,indicating low machine temperature. When the temperature of the machine exceeds some preset level suchas 1208C for class B insulated machines, the bridgebecomes unbalanced and the contacts close.
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