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Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
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Bundled conductors are employed to improve
Appearance of transmission line
Mechanical stability of line
Current carrying capacity of line
Corona performance of line
Corona performance of line
Bundled conductors are primarily employed to reduce the electric field intensity at the surface of the conductors, which effectively minimizes corona discharge and its associated power loss ┬╖ By replacing a single large-diameter conductor with a bundle of smaller conductors, the equivalent radius of the transmission line is increased.
Bundled conductors are primarily employed to reduce the electric field intensity at the surface of the conductors, which effectively minimizes corona discharge and its associated power loss ┬╖ By replacing a single large-diameter conductor with a bundle of smaller conductors, the equivalent radius of the transmission line is increased.
EmaxтАЛ=rln(D/reqтАЛ)VтАЛ тАФ Surface potential gradient on conductor
GMRbundleтАЛ=(dnтЛЕr)1/n тАФ Geometric Mean Radius of bundle
Corona occurs when the electric field stress exceeds the dielectric strength of air ┬╖ The field intensity is inversely proportional to the radius of the conductor ┬╖ Using bundled conductors creates an 'equivalent' radius reqтАЛ that is much larger than the radius of an individual conductor, thereby reducing the surface potential gradient E=rln(D/r)VтАЛ. This reduction keeps the maximum surface stress below the critical disruptive voltage of air, suppressing corona.
Reduces the surface voltage gradient, limiting corona discharge.
Significantly reduces the inductive reactance of the line due to increased GMR.
Increases the transmission line capacitance, which improves surge impedance loading.
Allows for higher power transmission capacity over long distances.
Reduction in corona loss and radio interference
Decrease in line inductive reactance
Increase in surge impedance loading (SIL)
Better voltage regulation
Increased wind and ice loading on towers
Higher installation and maintenance costs
Complex mechanical design for spacers
Extra High Voltage (EHV) lines (400 kV and above)
Ultra High Voltage (UHV) transmission networks
Bundled conductors decrease inductance (L) and increase capacitance (C).
Option B (Mechanical stability) is generally compromised by increased wind resistance, not improved.
Option C (Current capacity) is secondary; while bundling increases the total cross-section, the primary reason for high-voltage application is corona control.
D is correct тАФ Bundled conductors reduce the surface potential gradient, which significantly lowers corona discharge and associated power loss.
Always remember that bundling increases capacitance and decreases inductance, making it an essential technique for long-distance EHV transmission to maintain stability.