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In HV transmission spacing between sub conductors of a bundle is approximately
20 cm
40 cm
80 cm
5 cm
40 cm
In high-voltage (HV) and extra-high-voltage (EHV) transmission lines, bundling sub-conductors reduces the surface voltage gradient and corona loss ┬╖ The spacing between these sub-conductors is typically maintained between 30 cm to 45 cm to optimize the effective radius of the conductor bundle and minimize line reactance.
In high-voltage (HV) and extra-high-voltage (EHV) transmission lines, bundling sub-conductors reduces the surface voltage gradient and corona loss ┬╖ The spacing between these sub-conductors is typically maintained between 30 cm to 45 cm to optimize the effective radius of the conductor bundle and minimize line reactance.
CbundleтАЛ=ln(DeqтАЛ/DsbтАЛ)2╧А╧╡0тАЛтАЛ тАФ Effective capacitance of bundled conductors
reqтАЛ=(nтЛЕrтЛЕdnтИТ1)1/n тАФ Equivalent radius calculation
Bundling increases the Geometric Mean Radius (GMR) of the conductor, which significantly reduces the line inductance and increases the capacitance ┬╖ By increasing the effective diameter of the conductor, the maximum electric field intensity at the surface of the sub-conductors is reduced below the critical disruptive voltage (corona inception voltage) ┬╖ Spacing is chosen to balance the reduction of corona effect with the mechanical requirement of maintaining the bundle configuration using spacer-dampers.
Bundling increases the effective GMR of the line.
Reduction in corona loss is the primary purpose of bundling.
Inductive reactance of the line is decreased by bundling.
Spacer-dampers are used to maintain sub-conductor spacing and prevent galloping.
Reduced corona loss and radio interference
Decreased line inductance leading to higher SIL (Surge Impedance Loading)
Higher power transfer capability
Increased wind and ice loading on the tower structure
Higher cost of installation and complex stringing process
400 kVTransmission lines
765 kV and UHV (Ultra High Voltage) Transmission systems
The spacing is optimized to ensure that the electric field at the surface of each sub-conductor does not cause air ionization.
For typical 400 kV lines, a two-conductor bundle is common; for 765 kV, a four or six-conductor bundle is used with consistent spacing.
B is correct тАФ The standard spacing between sub-conductors in a bundled transmission line is approximately 40 cm to maintain stable electrical characteristics and reduce corona effects.
Always remember that bundling increases the capacitance to ground and decreases the self-inductance of the transmission line, which directly affects the Surge Impedance Loading (SIL=ZsтАЛV2тАЛтАЛ).