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- W2366911466 abstract "A pilot protection of transmission line based on the amplitude of the pilot impedance is proposed.The pilot impedance is computed by using the ratio of the difference of the fault-superimposed components of voltage to the summation of the fault-superimposed component of current at each phase of the both terminals of the line,and according to the amplitude of this impedance,whether the fault occurres at the line can be judged.When the fault occurres outside of the protected zone,the amplitude of the aforesaid impedance is significantly greater than the amplitude of series positive sequence impedance of the fully line,while it is obviously smaller than the determined value when the fault occurred inside of the protected zone.The proposed pilot protection not only has the characteristics of easy protective coordination,independent phase selection,stable function,sensitive operation and strong adaptation,but also possesses identity of the effective resistance of the influence brought by the line capacitor current and CT saturation.In EMTP simulation and the dynamic model experiment,the transmission line models of a 1000 kV 500 km and a 500 kV 50 km are established, and the latter considers CT saturation,uses the dynamic model data of Lanzhou-Xianyang 750 kV line, and executes the simulations under each fault.The simulation results indicate that the mentioned pilot pretection can all correctly mark each fault state." @default.
- W2366911466 created "2016-06-24" @default.
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- W2366911466 date "2011-01-01" @default.
- W2366911466 modified "2023-09-24" @default.
- W2366911466 title "A transmission line pilot protection based on the amplitude of the pilot impedance" @default.
- W2366911466 hasPublicationYear "2011" @default.
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