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Computer modeling of relays helps engineers understand how protection systems behave during faults and other disturbances. Simulators can assess the reliability of a protection system, determine the effect of correct and incorrect operation on a power network and if necessary help a relay manufacturer investigate new design ideas. The PSCAD/EMTDC transient simulator was used to model the effect of a fault on the protection and control system in a 132/11kV distribution substation. The operating response of each protection and control relay and the associated circuit breakers were monitored and stored in an event data base suitable for knowledge extraction studies.