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An auxiliary or interposing current transformer is fitted between a line transformer and its relay chiefly to

  • A.reduce the burden the relay imposes on the line transformer
  • B.prevent the line transformer from saturating on a heavy through fault
  • C.change the ratio or provide isolation
  • D.increase the accuracy limit factor of the line transformer beyond its rating

Answer: C

It adapts a standard five ampere secondary to a relay wanting some other current, or gives galvanic separation between schemes. It cannot improve the line transformer's own accuracy limit, and it adds a burden of its own rather than reducing one.

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