| With the rapid development of economy and acceleration of urbanization, power cable is used widely. But if the power cable goes wrong during use, it is difficult to locate the fault quickly. If can't eliminate the cable fault and restore power supply in time, huge economical loss will be made. For the normal operation of power grids, it is necessary to locate the cable fault rapidly and accurately. Under the mathematical morphology and wavelet theory, this article makes a thorough study of power cable fault location method, fault modeling and simulation, and designs a power cable fault location system.This article analyzes the initial time of reflected wave in power cable fault location. This article also introduces the basic concepts of mathematical morphology and wavelet, and studies the application of them in fault location of power cable, which mainly includes noise reduction and singularity detection. Then established fault model with MATLAB, simulation result shows that combining mathematical morphology and wavelet transform can solve the problem of the initial time of reflected wave, and improve the accuracy of power cable fault location.Then the fault location system of power cable is designed in this article. The hardware of system mainly contains high-speed data sampling circuit which contains high speed A/D chip for data acquisition and serial ports for data transmission, and display sampling data. The software of system mainly contains 2 parts:one is the program of lower computers with C++ language, which mainly used to initialize the system, sample data, display and transfer data; the other is PC software with C++language and MATLAB language, which mainly used to analyze and handle sampling data, and calculate power cable fault position.At last, the performance of power cable fault location system is tested in this article, The test result indicates that the system meets the requirements of power cable fault location. |
