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Most of the distribution systems are nowadays upgraded to underground systems. Cross-linked polyethylene (XLPE) insulation has been employed as an insulator in underground power cables due to its excellence in electrical properties. The environmental issues in service have been the major studied problem that associated with the formation of water treeing and reduction of XLPE insulation performance. In the humid underground environment where XLPE power cables are laid, a number of ionic solutions can be found which in the presence of water treeing can lead the aging process. This paper studies the effects of electric fields in the presence of Cu(NO3)2, CuSO4, FeSO4, K2SO4, Na2SO4, and NaCl solutions with water treeing radius of 0.1, 0.5, 1.0 and 1.5 mm in ANSYS MAXWELL 2D. Bush type water treeing resulted into 31 kV/mm in 1.5 mm radius with Cu(NO3)2, FeSO4, K2SO4, Na2SO4, and NaCl solution. In vented type water treeing, 38 kV/mm in 1.5 mm radius with CuSO4, was observed. The observed field strengths were above the minimum acceptable breakdown voltage (30kV/mm) of XLPE insulation but CuSO4 solutions showed great contribution in the intensification of electric fields.

Effects of Ionic solutions in Water Treeing Propagation of XLPE Insulated HV Cable by Using ANSYS MAXWELL 2D