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- W2387367058 abstract "A protection scheme that amalgamates the start element,the boundary protection element,lightning interference recognition element and the fault-line detection element is proposed for ultra high voltage DC(UHVDC) transmission line.Compared with polarity line voltage,line and ground mode,the amplitude and the velocity of variation of the first fault transient of pole wave are larger,thus the velocity of variation of pole wave is used to activate the start element.The information entropy is applied to describe,compare and estimate the feature of the fault transients to distinguish the internal faults from external faults.The absolute value of the pole wave caused by lightning strokes caused faults is far from zero axes.The value of the pole wave caused by lightning disturbances is around zero axes.The mean value of the pole wave is calculated to distinguish lightning disturbing.The area of the fault line pole wave with zero axes is much more than the non-fault line.The ratio of the positive pole wave area to the negative pole wave area is chosen to determine the fault line.The time window is taken as 5 ms to avoid the control system response to the transient protection.A large of simulation results with PSCAD show the protection principle is trustworthy and the method is reliable." @default.
- W2387367058 created "2016-06-24" @default.
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- W2387367058 date "2011-01-01" @default.
- W2387367058 modified "2023-09-23" @default.
- W2387367058 title "Protection for ±800 kV HVDC Transmission Lines Using Pole Wave Transients" @default.
- W2387367058 hasPublicationYear "2011" @default.
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