Power Cable Fault Location Based Wavelet Analysis

Accurate and fast power cable fault Location could increase power-supply reliability,reduce the cost of fault restoration and the loss of power cut.High voltage transmission lines have a greater probability and variety of fault than any other components in power system.Nowadays microprocessor has been widely used in protective relay,while traditional Fourier analysis and its improved algorithms are still the main tools for signal processing in power system,wavelet analysis,a new tool for time-frequency analysis,has been more and more widely used in power system.In the text,the new method utilizes properties of wavelet transform sufficiently both in time domain and in frequency domain. in order to eliminate the couple between the phases,phase-modul transformation is coming.It doesn't make modul components affected by environment condition,for example,frequency,and so on. Thereinto,transform matrix is Karenbauer transformation.As a result,Through modulus maxima of the wavelet transform the fault characteristic of the traveling waves are clearly represented. Transmission line fault location is very useful in power system.The current traveling have many fault information.We could utilize it to detect the fault position in the transmission line.The characteristic of the electrical system transient traveling wave is studied by using PSB based on MATLAB.The factors influencing fault location are analyzed,and the corresponding settlements are proposed,thereby fault location based on traveling wave by using Wavelet Transform is proposed.Wavelet analysis device based on the power transient sign is designed,including the hardware based on DSP TMS320F2812,data transmission between PC and DSP, the design of programming.