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The absolute method of testing an instrument transformer determines its errors

  • A.from measurements on the transformer alone
  • B.by comparison with a standard transformer of the same nominal ratio
  • C.by measuring its secondary output against a calibrated potentiometer
  • D.from the readings of a wattmeter in the primary and one in the secondary

Answer: A

The errors are computed from measured quantities such as the exciting current, the winding impedances and the burden, without reference to any other transformer. It is laborious, which is why comparison against a standard is the usual practice.

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