Establishing switchyard zones of a high or medium voltage switchyard

摘要

The present invention aims at minimizing the potential damage caused by the failure of a single central Intelligent Electronic Device (IED) responsible for calculating, assigning and storing information about switchyard zones of a high or medium voltage switchyard comprising switchyard elements (2, 3, 5, 7) interconnected by lines, and wherein the switchyard is operated by means of a Substation Automation system including a plurality of Intelligent Electronic Devices. To this end, a distributed switchyard zone management is introduced, comprising a distributed storage of the knowledge about the switchyard zones. In other words, assignments of individual switchyard elements or components, such as switches and connectivity nodes, to the various switchyard zones are stored on several IEDs. If one of these IEDs fails, the services or applications based on switchyard zones thus are not necessarily doomed, as would be the case if the entire knowledge about switchyard zones were stored on one single central IED. The switchyard zones considered primarily are either protection zones or equipotential zones. The first comprise a number of switchyard elements that are to be isolated simultaneously in case of a failure of a primary device, and their boundary or circumference is defined by circuit breakers and open disconnectors. The second comprise a number of switchyard elements that are galvanically connected, simplify the determination of a bus bar voltage and are delimited by open switches, i.e. open circuit breakers or disconnectors.