IEC 61850 9-2 Process Bus applications and benefits

The paper describes the abstract concept of Process Bus defined in IEC 61850 9-2 and then focuses on the implementation agreement that ensures the interoperability between merging units and protection devices from different manufacturers. The components of the Merging Unit, the requirements for its performance and time synchronization are described. Protection and recording applications based on the IEC 61850 Process Bus have some significant advantages compared to conventional. Some examples highlighting the benefits are presented. Improved flexibility of the system, reduced CT saturation concerns and open current circuit conditions prevention are some of the most important advantages discussed in the paper.