Transformer Protection

DESCRIPTIONThe relay type SIG is intended for the protection of electric lines and machines against overloads, short circuits and earth faults.The relay SIG features the following principal characteristics:* three input measuring circuits for the line currents;* measuring circuit, provided with a band pass filter, for the residual current;* protection functions and final relays completely programmable by the user;* selectable operation curves with independent or dependent time as well for the overcurrent as for the earth fault function;* direct read-out of all the input quantities ;* counting of the number of operations performed for each function;* counting of the cumulative switched currents for each pole of the circuit breaker;* storing the values of input quantities corresponding to the eight last operations (START or TRIP) and trace memory with pre and post-trigger (2.5 + 2.5s);* two different setting configuration;* blocking circuit, to perform accelerated protection schemes;* digital input circuits;* serial communication circuit RS485 with MODBUS?RTU protocol;* trip circuit supervision (TCS);* breaker failure protection (BF);* programmable disablement on lighting with programmable time setting;* real time clock with memory backup;* continuous monitoring of internal circuits.