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Study on Traveling Wave Location Method of Cable-overhead Transmission Line Faults

Author: GengWeiChao
Tutor: ZhaoShuTao
School: North China Electric Power University
Course: Theory and New
Keywords: Fault location Cable - overhead lines mixed lines Simulation Denoising Singular point detection
CLC: TM755
Type: Master's thesis
Year: 2011
Downloads: 95
Quote: 0
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Abstract


With the power cable for the more widely used in our country , the power system in recent years, a large number of cables and overhead lines mixed power lines , power line fault has become increasingly complex . Fault location technology can shorten the time of the failure to find , for the fast recovery of power has an important role . The paper first analyzes the principle of the traveling wave method of fault location technology using ATP / EMTP software to simulate typical cable - overhead lines mixed line fault , and summarizes the fault waveform variation . Then for test signal wavelet denoising threshold determination , the contrast threshold law denoising effect , a threshold calculation method based on the traditional soft and hard threshold method improved . Then elaborated wavelet analysis in the modulus maxima line search algorithm to find the fault signal singular point of principle , the characteristics of the cable - aerial hybrid line the upgoing signal at the junction mutation , a suitable cable - Overhead mixed line fault traveling-wave ranging . The final design of the power cable - hybrid circuit overhead line fault location system , including hardware part and the software part , to achieve fault test signal denoising , analytical processing , fault distance calculation and test data preservation .

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Lines and towers > Line maintenance
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