Assessment of lightning overvoltages on lines with different voltages sharing the same structures

The objective of this paper is to evaluate the lightning overvoltages that appear on a conventional 69 kV line, a compact overhead distribution line (spacer cable system) rated 11.4 kV and a low voltage line rated 220 V sharing the same tower. The simulations were performed using the software ATP (Alternative Transient Program) considering lightning strikes at the top of the tower, the mid span of the ground wire and one of the phases of the high voltage line.