OPTIMIZED ARCHITECTURES FOR PROCESS BUS WITH IEC61850-9-2

IEC 61850, the standard for communication in substations, supports all tasks to be performed in the substation and provides by the process bus option also the link to the primary equipment like switchgear and instrument transformers. It is shown that the standard supports the trends in substation technology like the use of combined and non-conventional instrument transformers. It is discussed how different architectures providing the requested protection zones fulfil the requirements for flexibility, availability and dependency, minimize the number of devices (cost, failure rate) and communication components and facilitate the implementation of the time synchronization needed for samples. How to get with these criteria the optimized process bus architecture is shown on the example of the one-and-a-half breaker substation topology.