Measurements of electrical resistances and investigations of factors affecting corrosion and breakages of shielding layers in extruded three‐layer 6.6 kV XLPE cables

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