# Electronic – the protective angle on high voltage lines be kept as small as possible

high voltagepowertransmission line

This website, https://circuitglobe.com/overhead-ground-wire-or-earth-wire.html, said for effective shielding, we should keep the protecting angle as small as possible, the angle between 20° and 30° is quite safe, and it should not be kept above 40°.

Why? I think the larger the protecting angle becomes, the longer will the $$\L\$$ be, that is, the range that shield wire can protect will become larger. Isn't it good to let $$\L\$$ become longer? Why does the website say we should keep the protecting angle as small as possible?