Search

Why do we need sag in transmission lines?

Sag is mandatory in transmission line conductor suspension.

This is because it protects the conductor from excessive tension.

In order to permit a safe level of tension in the conductor, conductors are not fully stretched; rather they are allowed to have sagged.

If the conductor is stretched fully during installation, wind exerts pressure on the conductor, hence the conductor gets a chance to be broken or detached from its end support.

Thus sag is allowed to have during conductor suspension.