Reliable operation of electrical equipment and power networks depends on the normal operation of the equipment of SDC. In large power stations and substations centralized supply direct current from the battery leads to the need for construction of an extended and extensive network of operational current. For direct supply of consumers DC provided a shield DC (direct-current board). Structurally, the shield consists of 9 gated cabinets, bilateral service with bottom cable and 7 distribution panels. SDC cabinets are made on JSC "Converter" (Moscow). Distribution of the current board consists of three sections, combined with sectional switches. Input supply is working on the second section, power backup SDC staff is carried out from here through the panel of mutual reservation. Emergency oil pumps engines, solenoid power circuit, emergency lighting, alarm and control circuits are powered on the first and third sections. Protection of SDC connections is carried out by breakers of VA 55-41 type and switch fuse RBKOO (with the fused DPU-33). To monitor the state of the DC microprocessor automatic system is applied.