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The traditional operation criterion of distance protection is to compare some measured impedances with a setting impedance. Due to the effect of decaying DC component, the measured impedances are generally imprecise in both amplitude and phase angle, which may result in incorrect operation of the protection. Based on the unmodified discrete Fourier transform, this paper deduces the phase angle error...
Current differential protection is vitally important for transmission lines, but its performance is evidently impacted by the distributed capacitance, shunt reactance, static-var-compensators etc. For improvement, the active power based differential protection algorithms have been proposed by some scholars. But the active power differential algorithms exist dead-zone, because the voltage and active...
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