Types of conductors use in Transmission line - Electrical C & V


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27 March 2020

Types of conductors use in Transmission line

What is Conductor?

The job of the conductor is to move the electric power from one place to another and with minimum resistance. By the way, there are many materials whose conductivity is very high. Like Gold Silver (Silver) but it is not possible to use them for wire in electrical systems, because they are very expensive.

For this reason, we have only two main materials, copper and aluminum. But in both of these times, aluminum is the only option left today.

Advantages of aluminum wire

However, the resistance of aluminum is 60% more than copper, which is a weakness of aluminum. For example, suppose you have a copper conductor 1 foot long and there is also an aluminum conductor of exactly the same size. So the resistance of copper conductor will be 60% more than that of aluminum conductor.

Difference Between Copper and Aluminum Wire 

But copper also has some drawbacks such as copper being 3 times heavier than aluminum and copper is also more expensive than aluminum. Today, copper is available for 500 rupees per kg, while aluminum costs only 100 rupees for 1 kg.

Apart from this, one big problem in copper is that the corrosion of copper wire is very easy, which is very harmful for its long life. You must have seen that copper in your house changes the color of copper vessel in 2-3 days, it is due to carbon coming on it.

This is also a main reason why we do not use copper wire in the transmission line.

After applying aluminum wire once, we assume its life value for 100 years, therefore aluminum wire is considered to be the most correct in the transmission line and it is used only.

But you will still see copper wire being used on some older substations. They are used there because these wires have to handle a lot of electrical current there. But still the chances of getting copper wire are very less today. Aluminum wire is being used everywhere in the transmission line.

Types of Transmission Line Conductor 

1. Solid Conductor
It is used in electric substation bus but it is used in short distance bus.


2. Hollow Conductor
It is also used in electrical substation bus and it is also used in short distance bus.

Their length cannot be kept much longer. Because if they are made long, then it will be very difficult to take them to the substation. Because these wires are difficult to bend easily.

3. Stranded Conductor
Aluminum Stranded Conductor in Transmission Line

It is made of thin wire, due to which they can be easily folded. And they can be easily transmitted from one place to another by wrapping them in rolls.

4. AAC (All Aluminum Conductor)
AAC Conductor in Transmission line

All the conductors are made of aluminum. Therefore the AAC wire does not rust. Because of their easy corrosion, they are used in areas near watery areas.

5. AAAC (All Aluminum Alloy Conductor)

All the wires in AAAC wire are also made of aluminum, but because aluminum is much more flexible, some metal is added to them. Due to which their strength is enhanced.
They are used in railway crossing and hilly areas.


6. ACSR (Aluminum Conductor Steel Reinforced)

It is the most commonly used conductor. The wire between it consists of Galvanized Steel. Which greatly increases the robustness of the ASCR conductor.

Due to the use of steel in this conductor, it does not spread much when heated. For this reason, wherever we use ASCR conductor, we can keep more of the difference between two electric poles.
ASCR conductors are used on both high voltage lines and flame voltage lines.

Type Of ASCR Transmission Line Conductor

i) Dog - Conductors in use from 33KV to 66KV are called dog conductors. Its current carrying capacity is up to 300 amperes. It consists of 6 aluminum strands, and 7 steel strands.

ii) Panther - It is used from 66 kg voltage to 132 kg voltage. In this, current up to 480 ampere can be given. It consists of 30 aluminum strands, and 7 steel strands.

iii) Zebra - Zebra conductor used for 220 kg voltage. In this, current up to 735 ampere can be given. Zebra conductor consists of 54 aluminum strands and 7 steel strands.

iv) Moose - These conductors are used on a line of 220 kW or 440 kW voltage, which can easily withstand current up to 800 amperes.
It also has 54 aluminum and 7 steel strands like zebra conductor. But the thickness of the strand in the moose conductor is greater than the zebra conductor. For this reason it can withstand more current than zebra conductor.

7. ACSS (Aluminum Conductor Steel Supported)

The ACSS conductor is being replaced by the ACSR conductor today, because the ACSS conductor has the ability to withstand much heat.

When the current capacity on the wire is increased, the temperature of the wire also increases. So come and


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