NCT is the protection system using current unbalance on neutrals composed in Double Wye Capacitor Banks signals to alarm or shut down the banks.
To measure the unbalance of current, the current transformer with low current value is used.
The current transformer ration and relay rating is seleted for the desired sensitivity.
NCT protection system is normally used on wide range of level from high to extra voltage capacitor banks, and can detect faults in all kinds of capacitor units.
Current Transformer with rated current value 1 is manufactured, therefore it is useful to protect Internal Fuse Type Capacitor Bank which has low fault current value on neutral.