Cable Fault Location Method Study Based On Wavelet Analysis

Drop cable and promote urban construction costs of the cable line extends to every corner of the city. The surrounding environment, as well as increase the manufacturing process is not fine cable laying cables cause cable failure more frequently, to the vast number of users and electricity companies to bring a series of difficulties. Therefore, rapid and accurate determination of fault location has become an urgent and arduous task.In this paper, based on the traditional fault location, wavelet analysis theory as the basis for fault studies, establish a fault signal processing methods to achieve accurate ranging ranging purposes. Study on fault location method which determines the traveling wave signal to a low pressure pulse reflection method as ranging, low-voltage pulse width is determined based on the approximate location of the fault. fault reflection signal wavelet transform, using the properties of the signal wavelet noise removal, scale decomposition, the reconstructed signal. Wavelet Denoising for determining a de-noising method based on particle swarm and wavelet transform, Prove more effective than the existing wavelet denoising Denoising; Using wavelet multi-scale decomposition of the signal output by the db1 scale to db7 scale decomposition, to remove the decomposed high frequency signal, Seven kinds of scales observed low-frequency signal, determine the optimal scale decomposition; For the reconstruction of this paper, a fault signal modulus maxima detect singular point values and curve fitting method of combining, detecting the position of the point of failure.Comparison of various methods ranging, select the low-pressure pulse signal injection method for fault, using ATP-EMTP electromagnetic transient simulation software to build simulation models cable; will be converted into a Matlab simulation model can identify files,for the power cable fault location model, Matlab toolbox fault signals analysis. Then the Matlab software ATP built model analysis, Studies to determine the signal cable fault type,fault distance, should use any way to repair the failure. Contrast the above simulation software and signal processing wavelet theory with the traditional methods, to prove the superiority and feasibility of the method of this paper.