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 Lines. It will be better if we say that neutral wire is not used in High Voltage Transmission Lines. Generally, the neutral wire is used for distribution and low-voltage transmission purposes. In fact, the use of neutral wire in low-voltage transmission line is also very rare.

Reason 1

The first and 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

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

So the electrical power is transmitted in a 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 about 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. The 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 that 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. Even we can generate a neutral point anywhere by changing the configuration of the transformed, so there is no valuable reason for laying an additional neutral over the whole transmission system.

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

Read Also:

• [Main] Difference Between Neutral and Earth Explained
• [Explained] Does Neutral Wire Give Electrical Shock or Not?
• Main Purpose of Using Neutral Grounding Resistor
• Main Difference Between Earthing and Grounding
• Earthing Advantages Purpose, Necessity in Electrical System

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