Discussion
A current transformer of nominal ratio 300/5 is found to give 4.98 A when the primary carries 300 A. Its ratio correction factor is about
Answer: C
Correct answer: 1.004
The actual ratio is \( 300/4.98 = 60.24 \) against a nominal 60, and the ratio correction factor is the multiplier that turns the nominal into the true value: \[ \mathrm{RCF} = \frac{60.24}{60} = 1.004. \] Being slightly above unity means the transformer reads low, so the measured current must be scaled up - and a correction of 0.4 per cent is within the tolerance of a metering class transformer.
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