Though the real big difference is simple: an arrester is charged and “operates” when working, while the rod simply attracts and diverts incoming lightning. ... When potentially dangerous lightning strikes, the arrester activates and diverts the lightning to ground, where it will disperse harmlessly.

How do lightning arrestors work on power lines?

A lightning arrestor acts as a conductor, allowing the voltage surge to flow to the ground. That keeps the substation equipment within design limits and protects the equipment from damage. ... The voltage from the lightning travels down the static wire and into the ground where it dissipates.

What is the best location of lightning arrester and why?

Lightning arrester should be located close to the equipment that it is expected to protect. In large substations, arrestors should be installed at take-off points of the lines and of the terminal apparatus.