| Along with the power cable is used more and more widely in our country recent years, Power system appeared a lot of power cable and overhead line mixed electric transmission lines, therefore the fault of electric transmission lines is also more and more complicated. Fault location technology can shorten the finding time of electric transmission line troubles, which has the vital role for quick restore power.Firstly, the principle of Traveling wave method fault location technology is analyzed in this paper, emulate to all kinds of cable-overhead line mixed electric transmission line fault with the software, and summarize the change rule of fault waveform. Secondly, for the problem of threshold determination in wavelet threshold de-noising of the test signal comparing the effects of different threshold value de-noising method, for the problem of threshold determination in wavelet threshold de-noising of the test signal, an improved threshold value calculation method is proposed, which is based on traditional soft and hard threshold value method. Thirdly, the theory that how to check fault signal singularities with modulus maxima line search algorithm in wavelet analysis method is expound, according to the characteristics of traveling wave signal happens in the joints of cable-overhead line mixed electric transmission lines, we proposed a new Traveling wave method fault location method on cable-overhead line mixed electric transmission line. Finally, a system is designed for cable -overhead lines fault location, and program modules such as de-noising and analysis of fault signal and calculation of fault distance and data retention are realized. |
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