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Why different types of poles used for transmission lines?

Question asked by Saaru in #Coffee Room on Oct 10, 2011
Saaru
Saaru · Oct 10, 2011
Rank E2 - BEGINNER
why different types of poles in transmission lines are used?? poles of 11 kv before stepdown transformer goes in triangular shape
but 440 v lines after step down transformer goes parallel ???
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neo23
neo23 · Dec 29, 2011
Rank D2 - MASTER
Do not exaggerate this thing.
11 KV has not only triangular shape, but it can be taken horizontally also.
If you take it in a triangular way , only one pole is used/ But if taken in a horizontal plane two poles are used.
But the main question is not of the poles - It is of 1. How many circuit (which depends upon Current which is to be fed) 2. The Insulation Discs (Depending upon the voltage ...11 kv in your case)

Secondly , 440 v line requires 4 conductors to be laid on poles.
The voltage is very low as compared to HV poles. So very small discs are used. that can be embedded on a single pole.

And if you look on the 11 kv poles the size of the discs are bigger. And their numbers increase along with the voltage ratings
as per 2 per phase for 22 kv
3 per phase for 33 kv
so on.
not only this but the design of pole may vary on the basis of current being carried.... if current is large enough... a double circuit is used.
Thus these factors alter the design of poles.

Hope this satisfies you.

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