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.
Width of maximum right of way permitted as per forest conservation act ‘1980 and its subsequent amendment dated 25 th October, 1992, are as per Table 1. Researches are being carried out for further optimizing the Right of Way. Guidelines of forest environmental rules shall be followed to avoid excessive tree cutting i.e. all the trees should be cut from root level in the 3 m corridor below each line conductor / earth wires. In the balance corridor, trees branches are only to be lopped to attain the specified clearance as per Table 1. Table 1 – Guidelines for Right of Way as per forest conservations act 1980 and subsequent amendment dated 25 th October, 1992 Line voltage (kV) 66 110 132 220 400 500 HVDC 765 Row width (Meter) 18 22 27 35 52 52 85 Electrical clearance: Electrical clearance while power lines crossing each other. In case of power line crossings, minimum clearance between lowest conductor of line and ground wire / top conductor of ...