SYSTEM FOR PROTECTION ZONE SELECTION IN MICROPROCESSOR-BASED RELAYS IN AN ELECTRIC POWER SYSTEM

摘要

The system uses graph theory to define busline arrangements as a series of vertices and edges, wherein the vertices include the number of busses in the system and the edges include disconnect circuit branches connecting the individual vertices. A particular system configuration, selected by the system operator, determines the status (open or closed) of the various disconnect branches. A processor establishes an incident graph matrix, including positions of all the vertices and edges. The matrix is modified in accordance with graph theory and the condition of the disconnect switches. Graph operations are performed to produce a resulting matrix which defines vertices and the edges incident thereon into zones of protection. Fault analysis in the busline can then be performed in accordance with each zone of protection.