This paper introducesa new expert system (ES) for faulted section determination in
electrical power system andinterpretingthe performance of the protective system (relays
and circuit breakers). The introducedESrequiresinformation about the power sy
stem
configuration and about the contacts status (open/closed) of the circuit breakers and
protective relays. It can determine the faulted section quickly and accurately for all types
of faults including simultaneous faults. It is general, i.e.it can be usedwith any power
system,due to the separation between the Facts and Rules. The introducedES isdeveloped
and tested by CLIPS environment (C Language Integrated Production System) which uses
forward chaining to derive conclusion.
The performance of the introduced ES is tested for several power systems, IEEE–6 bustest
system, IEEE–9 bustest system andIEEE–14 bustest system, and it shows a distinct
performance for all tested systems. But for space limitation, we present in this paper the
performance results of the introduced ES for the IEEE–9 bustest system only.
