Dissertation > Excellent graduate degree dissertation topics show

The On-line Fault Location Study on Coal Mine Underground Power Cable

Author: MaShiShen
Tutor: TianShu
School: Henan Polytechnic University
Course: Proceedings of the
Keywords: Colliery Power cable Wavelet Transform Traveling wave Fault Location
CLC: TM755
Type: Master's thesis
Year: 2009
Downloads: 71
Quote: 0
Read: Download Dissertation

Abstract


Most of China's coal mine grid is composed by a short cable trunk-style vertical network, due to the conditions of underground coal mine, the transmission lines are often single-phase short-circuit fault occurs, the event of a single-phase short-circuit fault, it is difficult to quickly identify point of failure, so far, the coal mine transmission line fault still lacks effective methods. When coal mine underground transmission line failure, the exact point of failure find not only can reduce the burden on the patrol line, shortening the failure to find time to speed up the line power is restored, the weak link of the transmission line, there may be early detection is reduced due to power outages caused by the loss, so the precise fault location is one of great significance to the research topic. Coal mine underground transmission line failure point of failure the transient high spread to the line ends bus traveling wave, rich fault distance information is included in the traveling wave transient high, ranging methods are transient traveling wave as unwanted interference harmonics to filter out, in fact, the use of transient high-frequency traveling wave can achieve accurate fault location method of traveling wave fault location is based on the above principle. In this paper, based on careful analysis of transient traveling wave propagation and its influencing factors, using wavelet transform time-frequency localization features to extract transient traveling wave fault distance information, and then compare wavelet transform transient traveling wave mode pole large value polarity, can accurately capture the failure initial traveling wave, the point of failure secondary reflected wave and the reflected wave reaches the end of the busbar detection busbar moment, in order to achieve transient traveling wave to reach the precise positioning of the measurement bus. Traditional single-ended traveling wave fault location method is simple in principle, but there is the problem of the identification of the reflected wave and SLF also exist ranging dead. Double-ended traveling wave fault location independent of line types and fault resistance, but needs ranging both ends precisely on time. Whether traveling wave fault location of single-ended or double-ended traveling wave fault location and line wave velocity uncertainty due to a fault occurs, will lead to inaccurate results of fault location, and the coal mine is a single-ended power supply system , only single-ended traveling wave fault location. In this paper, based on single-ended traveling wave fault location for the shortcomings of the traditional single-ended traveling wave method proposed wave fault location method for single-ended a wave speed automatic compensation for the impact of traveling wave ranging accuracy key issues, the paper proposes the corresponding solutions, simulation tests prove that the algorithm can effectively solve the various failures of transmission lines ranging issues.

Related Dissertations

  1. Feature Extraction, Selection and Combination in Lipreading,TP391.41
  2. Research on Identification System of Cashmere and Wool Fiber,TS101.921
  3. Image Fusion Algorithms Based on Multi-scale Analysis,TP391.41
  4. Feature Extraction Technologies Research and Implementation of 3D Models Based on Wavelet Transform,TP391.41
  5. Design and Implication of Image Compression System Based on Wavelet and DM6446,TP391.41
  6. Combined DWT Dynamic Data Reconciliation Research and Application,TP274
  7. Traffic Prediction Model Based on Wavelet and Markov,TP393.06
  8. The Study of Image Watermark Base on Discrete Wavelet Transformation,TP309.7
  9. The Compression and Application of the Brain CT Image,TP391.41
  10. Inspection and Recognition on a Class of Tool Processing Trace,TP391.41
  11. Research and Implementation of Dwt-based Video Codec System at Low Bit Rates,TN919.81
  12. Improved ROI Coding Method Based on SPIHT,TN919.81
  13. Two Algorithms for Image Processing Based on Chaos and Fractal,TP391.41
  14. XLPE High-voltage Cable Insulation Monitoring and the Experimental Research,TM247
  15. Study of Ultrasonic Location for Partial Discharge in Transformer,TM855
  16. Fault Localization Technology and Its Practice Based on KBC and Noise Reduction,TP311.52
  17. Radial Shearing Interferometry Test Technology,TH744.3
  18. CUDA-based video fire detection system,TP391.41
  19. Helicopter main gearbox fault diagnosis and failure prediction technology research,V267
  20. Using wavelet transform and optimize embedded block truncation coding for image compression,TP391.41
  21. Based on DSP and FPGA fabric inspection machine image processing system design,TP391.41

CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Lines and towers > Line maintenance
© 2012 www.DissertationTopic.Net  Mobile