A hybrid polymer matrix composite for electrical transmission line supports

The mechanical properties of a carbon fiber/E-glass fiber, polymer matrix pultruded composite were evaluated. The composite is to be used as the strengthening member for overhead electrical conductors. Presently, aluminum conductor steel reinforced (ACSR) lines can operate only at low (100°C) temperatures and at low power (≤1000 Amps maximum). At 100°C, ACSR sags above acceptable limits, thus limiting the capability to deliver more power during peak demand. A new conductor, called ACCC, for aluminum conductor composite core, was developed which has a 50% higher power capacity than conventional ACSR conductor. The composite core has a tensile strength of 2440 MPa (354 ksi), twice the strength of steel and twice the strength of a new conductor that features a metal matrix composite core. The tensile strength decreased as a function of temperature, reaching the tensile strength of steel at 200°C. The flexure strength was 944 MPa (144 ksi), the flexure modulus was 47.4 GPa (6.9×10 ⁶ psi) and the shear strength was 55.3 MPa (8 ksi).