Final answer:
Lightning arresters in a substation protect the sub from lightning strokes and surges from switching.
Step-by-step explanation:
The statement “Lightning arresters in a substation protect the sub from lightning strokes and surges from switching” is true.
Lightning arresters, also known as surge protectors or surge arresters, are devices designed to protect electrical equipment and installations from the damaging effects of lightning strikes and power surges resulting from switching operations. They work by providing a low-impedance path for the lightning current to flow, diverting it away from sensitive equipment and preventing damage.