System for protection zone selection in microprocessor- based relays in an electric power system

摘要

A system for protection zone selection for a power system bus comprises: means for receiving information concerning a bus arrangement in a power system, including the number of busses in the arrangement (12,14,16 and18), and graph based information concerning the arrangement, including the identification of vertex and edge portions of the bus arrangement, wherein the edges include disconnect circuit branches and circuit breaker-current transformer (CT) branches (30 to 36) and the vertices include the busses and convergence points between disconnect branches and circuit breaker-CT branches; means for receiving the operational status of the disconnect branches and the circuit breakers, the operational status defining a selected operational configuration of the bus arrangement; processor means (20) for establishing an incidence graph arrangement indicative of the vertices and edges and for altering the established graph arrangement based on an actual operational status of the disconnect switches and the circuit breakers and means for selecting a series of protection zones covering the busses in the bus arrangement, from the graph arrangement.