Why are the conductors used for high voltage transmission stranded?

Stranded wire tends to be a better conductor than solid wire because the individual wires collectively comprise a greater surface area. It is used when higher resistance to metal fatigue is required. The stranded conductor is formed by twisting the strands together in layers.

What is the advantage of stranded conductor over solid conductor?

Another difference is flexibility. Stranded cables are much more flexible and can withstand more bending compared to rigid solid conductors that can break if flexed too many times.

Why are power lines stranded?

Generally, all types of conductors are in stranded form in order to increase the flexibility. Solid wires, except for very small cross sectional area, are very difficult to handle and, also, they tend to crystallize at the point of support because of swinging in winds.

What are the conductors used for higher voltage transmission standard?

The most common conductor in use for transmission today is aluminum conductor steel reinforced (ACSR). Also seeing much use is all-aluminum-alloy conductor (AAAC). Aluminum is used because it has about half the weight and lower cost of a comparable resistance copper cable.

Which is the topmost conductor in the HV transmission?

A guard wire or earth wire is the top most conductors in high voltage transmission lines. It is used mainly to protect lines from lightning. If in case lightning struck then it carries the excessive current inrush to ground.

Why stranded conductor reduces skin effect?

The shape of the conductor – Skin effect is more in the solid conductor and less in the stranded conductor because the surface area of the solid conductor is more.

Why is a bundling conductor used in transmission lines?

Bundling of conductors leads to increases in capacitance. An important advantage of bundled conductors is its ability to reduce corona discharge. Reduction in the formation of corona discharge leads to less power loss and hence improved transmission efficiency of the line. Reduction in communication line interference.

Which conductor do you think is the best for overhead lines where the transmission lines have high series resistance and inductance?

A guard wire or earth wire is the top most conductors in high voltage transmission lines.

Why do we use stranded conductors in overhead transmission lines?

Stranded conductors reduces the so called “SKIN EFFECT” which in turn will reduce the transmission losses and increase the efficiency of the transmission system. Why are overhead transmission lines not insulated?

What are high-speed transmission lines?

High transmission lines are power lines which carry large current. I= 1000000/√3×220=1300amp. This is very very high current. Very thick aluminium wire is required for such high current. Such a thick solid wire can be fragile. Strength will be low. So this wire stranded and reinforced with center steel wire.

How can we avoid skin effect in transmission lines?

So to avoid this skin effect we are using Stranded conductors where the implicatons are reduced as compared to the solid conductors. Stranded conductors reduces the so called “SKIN EFFECT” which in turn will reduce the transmission losses and increase the efficiency of the transmission system.

Why don’t we use steel conductors for power transmission?

Although steel has very high tensile strength, steel conductors are not suitable for transmitting power efficiently due to the poor conductivity and high resistance of steel. High strength alloys such as phosphor-bronze may also be used sometimes at extreme conditions.