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A current transformer is described as class 0.5 with a burden of 15 VA. The figure 0.5 refers to

  • A.the burden expressed as a fraction of the transformer's rating
  • B.the permitted ratio error as a percentage
  • C.the permitted phase angle error expressed in degrees
  • D.the ratio of the accuracy limit factor to the security factor

Answer: B

The class number is the limit on the ratio error at rated current with the stated burden, in this case half of one per cent. A separate table gives the corresponding limit on the phase angle, in minutes, and wider limits at fractions of rated current.

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