The residual overvoltage relay SPAU 110 C is designed to be used for earth fault protection and supervision in isolated neutral, resistance earthed or reactance earthed networks. In resonant earthed networks, the relay start signal can be used to control the switching device of the neutral resistor. The protection relay can also be used for the earth fault protection of generators and motors and for the unbalance protection of capacitor banks. The protection relay forms an integrated protection scheme, including two-stage earth-fault protection and flexible trip and signal functions. |