Practical experience with induced voltages and currents in double-circuit transmission lines

On a double circuit transmission line, maintenance work can be performed using conventional working methods on the de-energized system while the other one is still energized. Due to capacitive and inductive effects, induced voltages and currents appear on the phase conductors of the passive side. The induction rate depends on the geometrical position of each wire, the voltage and current conditions on the active side, and the inductive impedance parameters of the ground and wires. Our study presents the phenomena of induced voltage and current and their influential parameters in case of double circuit transmission lines. Aside from the theoretical calculations, we conducted on-site measurements on two different typical tower layouts in Hungary. The results of these measurements differ from the theoretical values, which are discussed in the paper.