Abstract
Corrosion and breakage of shielding copper tapes are one of the factors for degradation of extruded three-layer (E-E type) 6.6 kV cross-linked polyethylene (XLPE) cables. Tohoku Electric Power Network has been measuring electrical resistances of shielding layers in E-E type 6.6 kV XLPE cables, and recently have found breakages of copper tapes. The authors performed an accelerated degradation test for copper tapes of E-E type 6.6 kV XLPE cables by taking account of aqueous solution, temperature, heat cycles, bending stress, frequency of an applied voltage, and water-proof layer in test condition, and investigated causes of breakage of copper tapes. Cracks and breakages of copper tapes occurred in the cables without water-proof layers, but no crack of copper tapes occurred in the cables with water-proof layers, when heat cycles were applied to the cables, and copper tapes were supplied with artificial sea water. We investigated the suppressive effect of the cables with water-proof layers on cracks and breakages of copper tapes by measuring tensile strengths of copper tapes obtained from the cables with and without water-proof layers.
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