Why Neutral Wire is not used in Transmission Line?


In this article, we are going to know why Neutral Wire or Neutral Conductor is not used in Transmission Line. It will be better if we say that neutral wire is not used in High Voltage Transmission Line. Generally, the neutral wire is used for distribution and low voltage transmission purpose. In fact, the use of neutral wire in low voltage transmission line also very rare.


Reason 1

The first most important point is, to reduce cost. In fact, it is the main reason. Yes, to reduce the cost of the transmission line neutral wire is not used.



In the whole electrical transmission and distribution network, the first transformer is the generation transformer which is installed in the generation plant and the last transformer is the distribution transformer.

Click on the image to enlarge
Why Neutral Wire is not used in Transmission Line


As you see in the above figure, the generation transformer has star-delta configuration and the distribution transformer has delta-star configuration. Now, you may understand there is no need for the neutral wire because in delta connection neutral point does not exist.

So the electrical power transmitted in delta configuration to reduce the transmission line cost where the neutral wire is not required.


Reason 2

Let's find the answer from the point of view of Loads.



First of all, let's think why we need neutral wire? The answer is when we use a single phase load. By taking any one phase wire from three phases and the neutral wire we drive the single-phase load. Single phase load can be connected only when the low voltage distribution supply is available. So it is clear that the loads are connected to the end of the distribution network. In the transmission line, there is no load can be connected so there is no need for the neutral wire.


Reason 3


In the distribution network, as the different loads are connected in three phases, so here the neutral is required and is to be grounded to balance the total three-phase system. But in the transmission line, no load is connected and all the three phases are balanced, so here the neutral wire is not required.

These are the reasons why the neutral wire is not used in the transmission line.




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Why Neutral Wire is not used in Transmission Line? Why Neutral Wire is not used in Transmission Line? Reviewed by ETechnoG on 10:13 Rating: 5
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