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Different protections applied for capacitor bank

Different protections applied for capacitor bank are as below:-
External fuses (for 11KV) and Internal fuses (for 22/66/132 KV capacitor banks) of adequate thermal capacity to take care of internal faults.
IDMT over current & earth fault relay for over current and earth fault protection.
Over voltage, instantaneous no voltage protection & power factor control.
Neutral Current Transformer (NCT) for current unbalance detection in case of 22/66/132 KV double star capacitor banks.
Residual Voltage Transformer (RVT) for unbalance voltage detection of 11KV single star bank as well as for quick discharge.
Series reactors to limit parallel switching current and to reduce the effect of harmonics.
Off load isolators/ load break switches to isolate capacitor banks.
Capacitor switches for switching pole mounted capacitor banks.
Discharge resistors to reduce residual voltage from crest value of rated voltage to 50 volts or less within 5 minutes.

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