From August 24 to 29, more than 3000 industry leaders and experts met in Paris for the CIGRE conference 2008. This conference assembles every second year all the study committees of the CIGRE to one large event. Each study committee has one full day session, where two or three preferential subjects are discussed.
On Wednesday, the study committee B5 - protection and automation - met in a session with about 400 attendants. The study committee had selected the topic "Impact of process bus (IEC 61850-9-2) on protection and substation automation system" as preferential subject 1. The discussion on this subject was grouped in the following five main topics:
The conclusions from the papers and the discussions are summarized in this article.
IEEE C37.117 is a Guide for the application of protective relays used for load shedding and restoration during electric power system abnormal frequency conditions. It presents background information, bibliography, and recommendations. It discusses abnormal frequency power system behavior, existing load shedding and restoration practices, the abnormal frequency function of typical protective relays, and possible new methods for improved load shedding and restoration. This Guide is limited to electric power system applications and does not include Abnormal Frequency Protection for Power Generating Plants. It was developed because at the time there was no IEEE Guide for the application of protective relays used for load shedding and restoration during electric power system abnormal frequency conditions. This Guide complements the IEEE Guide for Abnormal Frequency Protection of Power Generating Plants. It provides information to assist in the application of load shedding and restoration schemes. Methods and examples are provided. The material is presented in fifteen parts and one appendix. More
