SYS800 series of computer protection and monitoring device suitable for 110kv below the voltage level of protection and control unit interval, with perfect protection, measurement, control, backup power from posting communications monitoring, substation, power plants, high and low voltage power distribution and factory power system protection and control to provide a complete solution that can effectively protect the safety of high and low voltage grid and auxiliary power system of stable operation. Can and other protection, automation equipment together, through the communication interface automation system. All devices can be centrally installed screen group, may also be installed in low voltage switch cabinet.