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As a real‐time application, CA uses current SE system conditions to determine the effects of specific, simulated outages (lines, generators, or other equipment) on power system security or higher load, flow, or generation levels. In addition, CA considers unexpected failure or outage of a system component (transmission lines, generators, circuit breaker, switch, or any other electrical equipment) and naturally line overloads or voltage violations or higher load, flow, or generation level [26–27].

Failed or nonfunctional CA application has been identified as a key cause of many significant blackouts. Therefore, it must be highly available and redundant. The information produced by CA allows the operator to implement mitigation actions ahead of a contingency and maintain the reliability of the electric power system.