Why do we need sag in transmission lines?
Why do we need sag in transmission lines?
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Answer:
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.