Why are Bundled Conductors used in High-Voltage Transmission Lines instead of a Single Conductor?
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As transmission voltage increases using a single conductor for each phase becomes less efficient.
Therefore power utilities utilize bundled conductors where two (or) more conductors are grouped together & connected electrically to act as one conductor.
Primary Reasons
Reduces Corona Loss
High voltage (HV) lines create a strong electric fields around conductors.
Bundled conductors spread the electric field over a larger area which is reducing corona discharge & associated power losses.
Increases Power Transmission Capacity
Bundled conductors can carry more power efficiently than a single conductor of an equivalent size.
Improves Transmission Efficiency
They reduce the transmission lines inductive reactance and improve voltage regulation which resulting in lower transmission losses.
Reduces Noise and Interference
Corona discharge may generate audible noise and radio interference.
Bundled conductors used to minimize these effects.
Provides Better Cooling
Multiple conductors have a greater surface area exposed to air that is allowing better heat dissipation & higher current-carrying capability.
Bundled conductors are used in high-voltage transmission lines because they reduce
- Corona losses,
- Improve efficiency,
- Increase power-carrying capability,
- Minimize noise and interference and
- Enhance all the overall performance of the transmission system.