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Increasing the burden on a current transformer

  • A.increases its ratio and phase angle errors
  • B.reduces its errors
  • C.has no effect on its errors
  • D.reduces its ratio error but increases its phase angle error

Answer: A

A larger burden means a larger secondary voltage, hence a larger core flux and a larger magnetising current, and it is the magnetising current that constitutes the error. This is why the leads are kept short and why an unused instrument is removed rather than left in circuit.

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