An Investigation and locating Water tree degradation in Power Cable Insulation based on Pulse Voltage

Abstract

Water-tree is a serious problem in the underground power cables due to degradation mechanism. Therefore, it is progressively significant to study the effect of water-tree by modeling vented trees at the outer and inner surface of the insulation. The existence of a vented water tree is the common fault in aged cable leading to cable deterioration. Hence, the precise model emphasizes water trees using the Finite element method (FEM) under different levels of growth in insulation. Diagnostic techniques are still needed to enable the estimation of the level of damage present within a cable. This paper reported about the power cable current scenario of diagnostics method for pulse voltage application on 33 kV cross-linked polyethylene (XLPE) insulated cable used as a simulation model. Therefore, the propagation of high-frequency pulse within the cable that undergoes reflections from water trees could be investigated and its velocity of propagation was explored. The water tree lumped parameters are simulated and calculated analytically at different levels of growth across the insulation. Consequently, the diagnostics method developed by the way of the proper approach to detect water-tree based on charge intensity in electrical power cables.