De-icing EHV overhead transmission lines using electromagnetic forces generated by moderate short-circuit currents

This paper presents the test results of a new method for de-icing EHV overhead transmission lines following severe ice storms aimed at de-icing conductors with the lowest I_SC amplitude and duration. The method involves circulating short-circuit current (I_SC) at the rated voltage of the transmission lines and the subsequent action of electromagnetic forces that allow conductors to knock against each other and the ice to fall off. Tests were performed on a sample of overhead transmission lines of twin (315 kV) and quad (735 kV) bundles installed in the switchyard at IREQ´s high-power laboratory. Impacts on power system stability and power quality are also discussed and relevant conclusions are drawn for application of the new method on Hydro-Quebec´s power transmission system