Research on the transmission of sampled values of process layer based on IEC 61850

The transmission of sampled values is an important part of the serial communication between process layer and bay layer in substation automation system,and appearance of electronic current/voltage transformers makes possible digital transmission of sampled values.IEC 61850 defined the digital output regulation for sampled values.For the verification of sampled values digital transmission,a Publisher/Subscriber sampled values transmission model was established,and the structure and function of merging unit were introduced,which acted as the function of publisher.The abstract model was mapped into concrete communication stake.And a set of instantaneous values of current/voltage from a continuous time scale was packed obeying the frame defined by IEC 61850-9.Then build the socket using VC++ 6.0 network programming tool and realize packet send and reception on the socket.The result from multiple testing shows that packet delivery is unblocked and no message lost.This test verified the IEC 61850-based sampled values transmission,which have oriental meaning for practice.