Discussion
Match the fault with what it causes.
1. Open circuited current transformer secondary 2. Short circuited potential transformer secondary 3. Excessive burden on a current transformer
P. Increased ratio and phase angle error Q. Destruction of the winding R. Dangerous secondary voltage
Answer: D
Each fault follows from which kind of source feeds the transformer. A current source drives its core to saturation when denied a path; a voltage source pours current into a short; and an excessive but finite burden merely raises the flux and with it the errors.
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