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The polarity marks on the terminals of a current transformer exist so that

  • A.the higher of two available ratios may be selected correctly
  • B.the transformer is connected to the correct phase of the system
  • C.the burden may be connected without exceeding its volt-ampere rating
  • D.the direction of the secondary current is known

Answer: D

For an ammeter direction does not matter, but a wattmeter, an energy meter or a directional relay must know the sense of the current relative to the voltage. The marks establish which secondary terminal corresponds to which primary terminal at each instant.

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