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A capacitor bank on a distorted supply can be damaged because it may

  • A.generate harmonics of its own at a higher order
  • B.raise the power factor above unity at all times of the day
  • C.reduce the voltage at the point of connection
  • D.resonate with the supply inductance and amplify a harmonic

Answer: D

The bank's capacitance and the supply's inductance form a resonant circuit, and if its frequency falls near the fifth or seventh harmonic the current at that order is magnified severalfold. A detuning reactor moves the resonance below the lowest significant order.

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