Cable short open-circuit fault location based on wavelet transform

In order to reduce the blind area of the cable fault location and improve the ranging accuracy, we propose a fault location method for the cable short open-circuit. Through analyzing and comparing the traveling waves which are produced by using the rectangular wave and the bell-shaped wave to locate the fault point when a cable is open circuit in a short distance, we know that the inflection point between the transmitted wave and the reflected wave is obvious and easy to find if using the rectangular wave as the transmit pulse. Wavelet transform can process a signal in the multi-resolution and has good characterization for the mutant signal, so we can find the inflection point and measure the fault distance by using this. This method can not only provide reference point for artificial cable fault location, and also can realize cable fault automatic location. The measured results show that this method is accurate for the cable short open-circuit fault location and can reduce the blind area of traveling wave fault location effectively.