Blackouts are the most serious disruptions of power system operation without a doubt and any system can collapse under certain conditions of uncommon strain. Blackouts are composed by the effects of various types of disturbance or fault on the power systems. Large blackouts are initiated by a single event that gradually leads to cascading outages and eventual collapse of the entire system [1]. Whatever the cause, the power system is effected by a natural environmental phenomena. The result of phenomena can be either overvoltage or undervoltage. Overvoltage and undervoltage generally are not the result of system faults, but are caused by load variations on the system and system switching operations [2].
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