Capacitor banks are used in the power system for compensating the reactive power and for filtering harmonics. The capacitor banks are usually protected against overload caused by harmonic currents and over-voltage caused by internal faults in the bank. Protection against unintentional reconnection of a charged capacitor to an energized network is also to be included. All these functions are incorporated in the SPAJ 160 C relay.
A complete protection system for capacitor banks should also include overcurrent, short circuit and earth-fault protection. The capacitor protection relay SPAJ 160 C is easily supplemented with adequate over-current and earth-fault relays from the SPACOM product range.