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This paper studies the electric field distribution of water treed Cross-linked polyethylene (XLPE) insulation of HV underground cable under NaCl solution assigned in water treeing. It is significant to study electric field distribution in order to examine the harmful propagation in presence of NaCl solution. COMSOL Multiphysics was used in modeling and simulating insulation layers of XLPE cable, vented and bow-tie water treeing, and NaCl solution. The propagation was studied in vented and bow-tie water treeing under NaCl solution when AC peak voltage was applied to the copper conductor. The results showed that the maximum field strength exists at the tip of water needle for Vented water treeing and on the sides toward electric field strength for Bow-tie water treeing. This maximum value may lead the formation of conducting channel toward electric field strength. The presence of NaCl solution has seen to greatly influence the formation of conducting channels than DI water when assigned in the vented type water treeing.

Simulation of Electric Field Distribution in Water Treed XLPE HV Underground Cable Using COMSOL Multiphysics