Elasticity and Heat Resistivity of Heat-Treated High Voltage Conductors

The increase in electricity demand puts a large load on electricity transmission and distribution networks. A quick solution for a given section is to replace the conductor with hightemperature low sag conductors. A continuous operating temperature of 150–200 °C instead of 80 °C means a higher current carrying capacity. However, an important issue is the size of the clearance, that is, the sag of the conductor. It is necessary to consider the change in the sag not only at the operating temperature but also in case of possible overloading. The value of the sag may be different from one span length to another, so it is worth examining the elastic behavior of the conductors in a general study. The article presents the results of this study for three conductors constructed from different aluminum alloys and steel grades. Standard ACSR conductor tested which contain hard drawn, unalloyed aluminum wires and galvanized steel wires. An AACSR conductor is produced with the same construction as ACSR one from alloyed aluminum wires and galvanized high strength steel wire which was also tested. The results compared to the measured values of a high-temperature low sag conductor consisting of heat-resistant aluminum wires and aluminum cladded steel wires.