Temperature Response of OPGW with Mixed Armored Aluminum Covered Steel Wires and Aluminum Alloy Wires Submitted to Short‐Circuit

Abstract
The present paper focuses on the heat transfer problem that describes the heat conduction effects in an OPGW submitted to short-circuit. An analytical solution is proposed which accounts for the effect of the temperature gradients in the aluminum covered steel wires, and the contact thermal resistance in the effective contact surface between the fiber extruded aluminum tube and the aluminum covered steel wires. The numerical results are compared with results previously obtained and reported in the 54th IWCS Conference, for an OPGW with armored steel wires with the same dimensions. The analytical solution is expressed in terms of integral equations, which can be numerically solved in terms of the heat flux, as well as the temperature of the tube and the wires. The present approach is appropriate and effective to make design parameter sensibility analysis as well as for parameter estimation of the thermal contact resistance. The numerical results reported here show that the aluminum layer of the steel wires are very effective in reducing the electrical resistance of the cable and therefore, the temperature gradients in the steel wire as well as the temperature increase in the aluminum tube.