Real-time measurement of communication subsystem of intelligent electronic devices

IEC 61850 defines two types of specific communication service mapping (SCSM) for sampled values communication among intelligent electronic devices (IED): sampled values over serial unidirectional multi-drop point to point link in IEC 61850-9-1 and sampled values over ISO/IEC 8802-3 in IEC 62850-9-2. In view of the importance of real-time communication, packet transfer model was built following IEC 61850, the measurement and calibration method of processing delay for electronic transformer were designed, and the maximum packet transfer delay by queuing theory was calculated. The relevant theoretical analysis and simulation results indicate that the delay of sampled values message could be compensated and its affection on real-time communication of IED could be improved by adopting appropriate network topology.