The incidence of Falt in the network, the electricity cause complications in network equipment, especially in power plants that led to Tripp (shot don an emergency) generators, and thus the blackout in the network. For example, due to voltage drop in these conditions, capacity in the power plant the ability to continue the work, they will not have and of the circuit Get Out leads them to Tripp, generator will. Therefore, the protection network must be in the interval of time shorter than this to happen, the unhealthy from the healthy part separate. In other words, the maximum is when the Protection System opportunity is the Falt of the network separate.