Research on Cable Fault Location Based on VMD and Improved Dual Terminal Traveling Wave Method
To solve the large position error affected by wave velocity,noise,and end effects of the tradi-tional cable fault location method based on traveling wave,this paper proposes a fault location method based on variational mode decomposition(VMD)and improved dual terminal traveling wave methods.At first,the improved dual terminal traveling wave method is proposed to eliminate the influence of wave ve-locity on distance measurement.Then,the VMD method is used to solve the problems of modal aliasing and endpoint effects on the basis of wavelet denoising.Finally,accurate calibration of the wave head for ca-ble fault can be achieved by the Hilbert transform.Results indicate that the proposed cable fault location method based on the VMD and improved dual terminal methods can effectively mitigate the influence of wave velocity,distance,and transient resistance on the measurement error.Moreover,accurate calibration of cable fault location can be achieved.
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