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The digitized transformation of conventional substation has become the hot topic in intelligentizing grids. In recent years, new electronic mutualinductor technology, IEC61850standard, intelligent circuit breaker and network communication technology are becoming mature, which provides technical assurance to solve the problem.This article focuses on the the digitized transformation of conventional 110kV substation.This paper, studied the concept of digital substation system, structural features and technical characteristics first, and analyzed the operating principle of IEC61850, goose networks, intelligent circuit breakers, electronic transformers and other new technology works; then this paper compared digital substation between the conventional substation, and proposed the vantage of digital substation in the interoperability, scalability, reliability and condition-based maintenance, and other areas. Secondly, this paper studied the digitizing technique in conventional 110kV substation applications, according to station level, bay level, process level and networking four parts, with the versatility and practical discussion of the digital program. This paper proposed the solution based on IEC61850-9-1 process layer, device interface layer solution supporting IEC61850 interval, internal support for centralized IEC61850, conversion of external configuration of the Statute of the station control layer solution and stopping the process control layer and network layer divided the process layer of sub-sampling point and independent GOOSE network networking solutions. Finally, as an example of the restruction of conventional 110kV substation in Jiangsu, we tested and verified the vantage that the program is feasible, economic, and stable in operation. At the same time, this paper gives the solution to optimize the program.
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