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An earth fault on a machine winding is located by

  • A.measuring the temperature rise on full load
  • B.applying a voltage and tracing where the current leaves
  • C.measuring the resistance between successive commutator bars
  • D.spinning the rotor and measuring the vibration

Answer: B

A low direct voltage applied between winding and frame, with the current traced along the winding, narrows the fault down to a coil or a slot. Insulation resistance measurement establishes that a fault exists but not where.

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