which integrates MMS( Manufacturing Message Specification) network of station level
GOOSE( Generic Object Oriented Substation Event) network and SV( Sampling Value) network of process level in smart substation
is analyzed. Aiming at the problems of real-time performance and reliability of network communication
an implementation scheme of three-in-one network based on PRP/HSR(Parallel Redundancy Protocol/High-availability Seamless Redundancy) protocol in IEC62439-3 standard for smart substation is proposed
and the key development points of key equipments are summarized. The experimental and testing results verify the reliability of the proposed scheme. The application design and analysis of distributed bus differential protection based on HSR ring network are carried out.