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The winding temperature rise of a machine is most accurately determined by

  • A.the change in winding resistance
  • B.a thermometer placed against the frame of the machine
  • C.the temperature of the cooling air leaving the machine
  • D.the temperature of the bearing housings after the run

Answer: A

Copper resistance rises with temperature in a known way, so measuring it hot and cold gives the mean winding rise directly. Embedded detectors give the hot spot, and frame or outlet air readings are both well below the winding temperature.

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