FANOX SILA OVERCURRENT AND EARTH FAULT RELAY

Overcurrent protection Function 50P Instantaneous phase overcurrent Function 50N Instantaneous neutral overcurrent Function 51P Inverse time phase overcurrent Function 51N Inverse time neutral overcurrent Function 46 Inverse time negative sequence overcurrent Overvoltage protection Function 59P Defined time phase overvoltage Function 59N Defined time neutral overvoltage Undervoltage protection Function 27P Defined time phase undervoltage Directional Power protection Function 32/40 Defined time directional power Recloser Function 79 This function is the responsible of reclosing the breaker when a fault occurs.

Phase directional protection Function 67P It uses the voltage between phases as the polarization magnitude and the phase current as the operating variable. If the directional function 67P is not enabled, it behaves as a 51/50P function.

The operative time starts when the following conditions are met simultaneously: - Polarization voltage higher than setting - Phase current higher than setting - Gap between phase current and polarization voltage is such that the phase current is within the area of the intervention.

Neutral directional protection Function 67N It uses the residual voltage as the polarization magnitude and the residual current as the operating variable. If the directional function 67N is not enabled, it behaves as a 51/50N function.

The operative time starts when the following conditions are met simultaneously: - Residual voltage higher than setting - Residual current higher than setting - Gap between residual current and residual voltage is such that the residual current is within the area of the intervention.

Additional Functions Function 52 This function allows monitoring of circuit breaker state and makes a preventive maintenance. Function 50BF This function allows showing a possible error of the circuit breaker opening. Function 74CS This function allows the supervision of breaker’s trip circuit.

CLP This unit is used in order to avoid non-desirable operations of overcurrent functions when the line is not energized.