125VDC Power Supply Station (PSS) for HV/MV Substation

125VDC Power Supply  Station (PSS) for auxiliary DC power source in the HV/MV Switching Substation feed the protection devices, breakers, RTU and other critical  devices in the substation, for that reason it is redundant to assure the adequate reliability. The PSS  assures a reliable supply to auxiliary equipment and consists in batteries charger, distribution system,  switching and protective devices and additional monitoring equipment. Redundancy is guaranteed  through two rectifiers which can operate  simultaneously or alternately.

In case of failure of the control logic, the rectifier in any case guarantee the maintenance charge  with current limitation and maximum voltage control. In the event of a short-circuit at the output terminals, each rectifier must limit the current supplied at its  nominal value and automatically reset when the short circuit is removed. The rectifiers are able to access at the measurements of the temperature probes that detect  the ambient temperature . Rectifier are controlled by the microprocessor to manage the various operating modes and  redundancy in case of failure.