For the installation configuration and telecommunication network problems and challenges confronted by substation secondary device outdoor installation

the principles of the secondary device outdoor installation configuration are proposed first

which include relay protection within both standalone bay and across bays

bay control unit and public terminal

etc. In addition

two telecommunication solutions are also given based on the above

which include two aspects

the first is the network architecture with MMS/SV/GOOSE network all in one based on parallel redundancy protocol(PRP)

and the second is high-availability seamless redundancy(HSR)network which is independent of the switch. Finally

network performance is estimated and compared quantitatively. This work is supported by State Grid Corporation of China.