Bundled conductors are used in Extra High Voltage (EHV) transmission lines primarily to

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This question was previously asked in

BSPHCL JE Electrical 2019 Official Paper: Batch 2 (Held on 31 Jan 2019)

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Answer 1

Concept:

Bundled conductor:

Bundled conductors are those conductors which form from two or more stranded conductors, bundled together to get more current carrying capacity.

Using bundle conductors instead of the single conductor in the transmission line increases the GMR of the conductors.

So, inductance reduces according to the following equation

H/m/ph

Hence, the inductance per phase of the conductor decreases

So, capacitance increases according to the following equation

F/m/ph

Hence, by using bundle conductors GMR is increased, so inductance L decreases, and capacitance C increases.

Advantages of Bundled Conductors:

The bundling of conductors leads to a reduction in line inductance.
The bundling of conductors leads to increases in capacitance.
An important advantage of bundled conductors is their 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.