Out-of-step technique based symmetrical fault analysis

During the normal condition of the power system, power flows through the line in nominal frequency. Sometimes the disturbances occur due to sudden load change or due to any fault in the transmission line. So during the recovery of the system electromechanical oscillation is there in the power system network which results in power swing, this encourages undesirable tripping or cascade tripping of line causes the power system blackouts. To avoid this situation like blackouts, Here current differential protection scheme and the phasor difference analysis between two bus power system is analyzed to detect the fault during out-of-step condition accurately.

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