Discussion
Which of the following would NOT reduce the errors of a current transformer?
Answer: A
Correct answer: increasing the length of the secondary leads
Longer leads mean more resistance and therefore more burden, which increases both the ratio and the phase angle error - as the earlier burden items show, the effect goes as the square of the secondary current. The other three all reduce the errors: a better core needs less magnetising current, removing an unused instrument lightens the burden, and turns compensation cancels the ratio error at the working point.
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