PD pulse propagation in shielded power cable for symmetric and asymmetric PD pulses

Partial discharge is a useful diagnostic method for a wide range of power apparatus. In the case of shielded power cable, partial discharge can detect workmanship-induced defects in accessories, as well as cavities and electrical trees in the dielectric. Shielded power cables can be considered lossy transmission lines. The high frequency attenuation of the cable causes the peak amplitude of a PD pulse, as well as the pulse energy, to decrease as a function of distance propagated. We develop analytical expressions which characterize the PD pulse propagation in a typical shielded power cable for both symmetric and asymmetric PD pulses for an attenuation constant which increases linearly with frequency, as is normally the case for shielded solid dielectric power cable