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The tuning inductance in a capacitive voltage transformer is provided to

  • A.filter out the carrier frequency signals injected onto the line
  • B.cancel the reactance of the capacitor stack at power frequency
  • C.limit the current drawn should the secondary be short circuited
  • D.prevent the core of the electromagnetic unit from saturating

Answer: B

Without it the divider would behave as a source of high internal reactance and its ratio would change with every change of burden. A series inductance tuned to resonate with the stack at the supply frequency makes the source impedance small and the ratio stable.

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