Detection & Localization of Faults in Transmission Lines Using Wavelet Transforms(coif Let & Mexican Hat)
نویسندگان
چکیده
Power transmission and distribution lines are the vital links that achieve the essential continuity of service of electrical power to the end users. Transmission lines connect the generating stations and load centers. As the generating stations are far away from the load centers they run over hundreds of kilometers. Hence, the chances of fault occurring in transmission lines are very high. Since faults can destabilize the power system they must be isolated immediately. Fault analysis is very important issue in power system engineering in order that to clear faults quickly and restore power supply as soon as possible with minimum interruption. Signal processing is one of the most important parts of the digital distance protection schemes. The faulted phases identification is done by analyzing the detail coefficients of the phase currents. To distinguish ground faults from phase to phase ones, the analysis of the smooth coefficients of the neutral current can be used. The proposed model is based upon a combination of the impedance calculation and the Continuous Wavelet Transformation (CWT) method to detect the disturbance along with distance of Fault occurrence. MATLAB/Simulink is used to generate fault signals and verify the correctness of the algorithm. Simulation results reveal that the performance of the proposed fault detection indicator is promising.
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