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The d.c. armature resistance of a Y-connected alternator measured across its two terminals is 0.5 ?. The per-phase resistance is

  • In a Y-connected alternator, the armature winding is connected between each phase winding and a common neutral point.
  • The per-phase resistance is the resistance between one phase winding and the neutral point.
  • In this case, if the measured d.c. resistance across the two terminals is 0.5 ?, this value includes the resistance of two phases and the neutral point.
  • To find the per-phase resistance, we need to divide this value by two.
  • So, per-phase resistance = 0.5 ? / 2 = 0.25 ?.
  • This is the resistance between one phase winding and the neutral point of the alternator.