Verification of a Computer Simulation based on the Pulse Propagation Characteristics for Detection of Water Trees in Power Cables

In this paper, a finite element simulation using time domain reflectometry for detection of water trees in power cables is verified through an experimental test. For the purpose of doing this, a diagnostic pulse generator which can be internally charged up to a maximin voltage of 5 kV is first produced, and then the experimental setup equivalent to simulation conditions is realized. In order to examine simulation results, two-type artificial defects are created for a 6.6 kV distribution power cable, and reflected pulse signals are measured on each individual case. Finally, the validity of computer simulation for detection of water trees in power cables based on the pulse propagation characteristics is proved through a comparative analysis between simulated and experimental data of the concerned cable with and without the defect.