New Approach for TDR Evaluation for PD Pulse Localization

Partial discharge diagnostic is a well proven method for detecting weak spots in medium and high voltage cables. Beside the key parameters, like partial discharge inception /extinction voltage, partial discharge values in pico Columb and the phased resolved pattern, the most interesting result is the point of localization along the cable. Without exact localization even the interpretation of the key parameters could lead to wrong conclusions. The permanent growth of the distribution networks exhibit in many times mixed cables structures. Impedance differences of paper-mass insulated and cross-linked polyethylene cables challenge the analysis in time domain reflectometry, which could be observed by multiple reflections. This paper describes an automatic localization algorithm for partial…