Noise Reduction of Partial Discharge Signals Using Linear Prediction and Wavelet Transform

Partial discharges are caused by various defects such as voids, shield protrusions, contaminants, advanced stages of water tree, etc and known the main cause of breakdown in insulation materials. Partial discharge (PD) location is a powerful and useful tool for the maintenance and operation of electrical power distribution cables. This paper describes the application of two digital signal-processing techniques (Linear prediction and Discrete Wavelet Transform) to partial discharge site location. These techniques have been used for both on-line and off-line PD location. Results show the effectiveness of these algorithms and by applying them to the acquired signal one obtain almost the true shape of PD signal under noisy conditions.