Discussion
Match the quantity with the type of transformer it belongs to.
1. Knee point voltage 2. Instrument security factor 3. Tuning inductance
P. Metering current transformer Q. Capacitive voltage transformer R. Protection current transformer
Answer: C
The knee point defines where a protection core stops reproducing fault current; the security factor says how early a metering core saturates to shield its instruments; and the tuning inductance makes a capacitor divider behave as a stiff source at power frequency.
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