DANSK DSF/IEC TR 61850-90-4 ED2 PDF

This part of IEC 61850 is a Technical Report intended for an audience familiar with network communication and/or IEC 61850-based systems and particularly for substation protection and control equipment vendors, network equipment vendors and system integrators. This Technical Report focuses on engineering a local area network limited to the requirements of IEC 61850-based substation automation. It outlines the advantages and disadvantages of different approaches to network topology, redundancy, clock synchronization, etc. so that the network designer can make educated decisions. In addition, this report outlines possible improvements to both substation automation and networking equipment. This Technical Report addresses data transfer over the network in IEC 61850, such as transmitting tripping commands for protection via GOOSE messages. This Technical Report addresses in particular the multicast data transfer of large volumes of sampled values (SV) from merging units (MUs). It also considers seamless redundancy to increase the network availability under failure conditions and the high precision clock synchronization that is central to the process bus and synchrophasor operation. This Technical Report is not intended as a tutorial on networking or on IEC 61850. Rather, it references and summarizes standards and publications to assist the engineers. Many publications discuss the Ethernet technology but do not address the networks in terms of substation automation. Therefore, many technologies and options have been ignored, since they were not considered relevant for a future-proof substation automation network design. This Technical Report does not address network security, which is subject of the IEC 62351 suite. This Technical Report does not address the technologies for communication outside of the substation, which is subject of IEC TR 61850-90-12. Guidelines for communication outside of the substation that uses exclusively the routable Internet Protocol have been published, especially in documents IEC TR 61850-90-1 (substation to substation), IEC 61850-90-2 (substation to control center) and IEC TR 61850-90-5 (synchrophasor transmission). However, data flows used in substation-to-substation communication, or substation to control centre communication such as R-GOOSE and R-SV are covered when they transit over Ethernet links within the substation. This Technical Report does not dispense the responsible system integrator from an analysis of the actual application configuration, which is the base for a dependable system.