Why we use earth wire at the top of phase conductor (Hindi)

Q)   Why we use earth wire at the top of.          phase conductor ?


*) Transmission line me jo tower ke top per jo wire hota hai wo transmission line ko lightning se protection deta hai, earth wire ko sabse top per isliye lgate hai ki lightning sabse pahle top wire per he aye, earth wire per koi voltage nhi hota isliye lightning ko bhi low resisting path mil jata hai or lightning top wire se tower ke through earth ho jata hai. 


*) Transmission line me top wire ko communication ke liye bhi use karte hai, transmission line me communication tower ke top wire ke through hota hai .


*) Transmission line me tower ke top wire ko hmm voice ko transfer karne ke liye bhi use karte hai, jb bhi hmm koi call karte hai wo tower ke through dusre person tk pahuchti hai. 

*) Ye top wire data ko bhi transfer karta hai, is wire me data jata hai usper  lightning ka koi effect nhi hota hai quki is wire me data light me form me jati hai or light ka current and voltage ka koi effect nhi hota.


*) Transmission line ke tower per top wire ko 'Optical ground wire' kahte hai isko short form me 'OPGW' kahte hai .



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