Earth-leakage protection relay SMPR-2

over-currentACfor feeder

The SMPR has been designed to measure line currents and thermal image, ground RMS current under normal conditions or under disturbances. This information is internally processed by the microprocessor, to take the protection actions defined by the user under ANSI, IAC or IEC standards. The operational conditions of the breaker or disconnector are also signalized. (49) Thermal Overload (50) Instantaneous phase overcurrent (50N/50G) Instantaneous ground overcurrent Overload alarm pickup level (51) Inverse time phase overcurrent (51N/51G) inverse time ground overcurrent ANSI, IAC or IEC/BS142 curves included: moderately inverse normal inverse very inverse extremely inverse definite time (67N) Neutral Directional Overcurrent (68) Blocking output (86) Lockout Accumulated KA per phase on breaker interruption