High Frequency Properties of Shielded Power Cable - Part 2: Sources of Error in Measuring Shield Dielectric Properties

摘要

High frequency propagation characteristics of shielded power cable have become increasingly important with the advent of field partial discharge (PD) testing of such cable and the evolving technology for distribution of wideband communications signals through the power distribution system. Both of these technologies depend on the propagation of megahertz signals over substantial distances. High frequency loss in power cables tends to be associated with structures that involve combinations of frequency-dependent resistance and capacitance, i.e., RC structures. The primary source of loss in shielded solid dielectric cable is the high frequency capacitive current, which is determined by the impedance of the cable dielectric passing through the complex impedance of the shield layers. This subject has been discussed extensively in the literature and was reviewed in the first paper of this series [l]-[5].