Discussion
A current transformer has a phase angle error of 30 minutes and is used with a wattmeter on a load of 0.5 power factor lagging. The error in the power reading is about
Answer: B
Thirty minutes is 0.00873 radian, and the fractional error is that multiplied by the tangent of sixty degrees, giving \( 0.00873 \times 1.732 = 0.0151 \). The error grows as the power factor falls, which is why phase angle is specified for metering transformers.
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