Commonly used ground wire of distribution networks under various operating and load conditions 

Anotace: Climate change is increasingly leading to extreme weather conditions that threaten the secure operation of high-voltage transmission and distribution networks. In recent years, significant damage and danger have been caused by icing of wires and damage or collapse of tower structures. Damage to the grid threatens the security of electricity supply. It is therefore appropriate to examine the appropriateness of the elements of the electricity network to the changed circumstances. Countries apply different methods to prevent the icing of phase conductors. In high voltage DC networks (e.g. in Russia and China) the de-icing of specified network sections can be accomplished with a simple solution, applying heating power. This method is not applicable in Hungary because we do not have HVDC network. For heating of phase conductors, a new method (the Dynamic Line Rating (DLR) method), based on changing the transmission capacity at HVAC networks, has been recently developed. However, I was not dealing with these methods because they are irrelevant to the de-icing of the ground wires of HVAC networks. Since there was no current flowing in the ground wires during normal operation and each tower is grounded, a new inductive warming method had to be developed. In this paper, I address the electrical and thermodynamic issues of this new method. In this article I mainly deal with the investigation of the ACSR type ground wire with 95/55 mm2 cross section, but the method can also be applied to phase conductors. During the investigations, the electrical parameters were determined by the LABVIEW software and the thermal calculations were carried out by Ansys Workbench software.