Why transmission line cables are loose ?

 

Why transmission line cables are loose ?

       Often when we look at the transmission lines going off the road, then we see all the lines slightly tilted. Also you can see in picture , there is a curve which is formed by transmission line due to losseness .

   After all, why are these lines kept loose? 

Before knowing the reason, we see some terms.

(01). The distance between two consecutive towers of an Overhead line is called span. 

(02)  Sag is the distance between straight conductor (which should be kept) and losse conductor (which is kept). The more tight the wire, the less the sag is. 

       

Inshort the Reason is  :  

       When this cable is loose, this cable allows vibration. Along with this, it also gives us protection from mechanical shocks that can come in our transmission.

     

Let's see how :

         You will know that our conductor, it expands when it is heated. It will expand and get bigger. Because if we heat a substance, then the millions of atoms in the subtance, they get energy in the form of kinatic energy. 

  Due to this, these atoms start to vibrate faster and the space between these atoms increases.

(1). Heat is generated due to the current flow in the conductor of our transmission line.

(2).On the other hand, according to the weather, heat is generated in it. Heat is generated in the transmission line due to the sun (like our metallic gate gets heated due to the sun.)

     

  Because of this, the amount of sag in the transmission line increases. But when the sun's ray is not there, then the value of the sag of the transmission line automatically decreases at that time.

    If we keep the transmission line tight, then heat will be generated in it, due to which there will be vibrations of atoms. And due to this mechanical shock on transmission line will be there to cut the transmission line by generating mechanical stress on it . That's why our transmission line is kept loose. 

Hope this helps you . Thank you ️❤️