Risk Assessment of Induced Currents and Voltages Under Maintenance Conditions Supported by Measurement Campaigns on HV/EHV OHLs

This paper deals with the risk assessment and the procedure to be followed to plan the maintenance interventions on HV/EHV overhead lines (OHLs). The possible occurrence of induced current and voltage phenomena, due to the proximity with other power lines, makes the procedure for maintenance intervention more rigorous. The maintenance protocol is also supported by the results of a measurement campaign carried out on a 380 kV double-circuit OHL of the Italian Transmission Grid, with the aim of evaluating the induced voltages and currents on one circuit, under maintenance, due to the normal operation of the second one in parallel.