Technology of digital substation

With the development of digital substation and extend of IEC61850 protocol,the digital substation has put into engineering practice. The first 220 kV digital substation in China,Duerbot substation,is introduced. The application of IEC61850 protocol,intelligent switch,electronic transformer and digital metrology system in the substation is analyzed,and the implementation scheme at this stage is expounded. Compared with routine substations,the superiority of digital substation is analyzed. Based on discussion of the security,reliability,economic effect and social effect,the digital substation is regarded as the development trend in future.