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To predict the location of dc line-faults in an HVDC system, a novel algorithm based on traveling-wave natural frequency using 10-ms current data from the single end is proposed in this paper. The relationship among the natural frequency of traveling wave, fault distance, and reflect coefficient at the terminal of the transmission line is presented. The multiple signal classification method is employed...
A new single ended fault location method is proposed using traveling wave frequency information for ultra high voltage direct current transmission lines. Being different from the traditional telegrapher's equations based analyzing methods, the proposed method is based on the traveling wave natural frequency. The transient signals are analyzed to extract the natural frequencies using discrete Fourier...
According to the distributing characteristic of residual stresses in aluminum alloy plate, this paper adopted modified layer removal method (MLRM) to measure it; based on elastic mechanics theory the solving process was deduced. Using finite element method the process of MLRM was simulated, by loading specimen with a known original stress distribution the stress was worked out with strain datum from...
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