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Bundled conductors in EHV transmission lines help in
Decrease capacitance
Decrease Inductance
Increase capacitance
Increase inductance
Decrease Inductance
Bundled conductors consist of two or more stranded conductors connected in parallel per phase, which increases the Geometric Mean Radius (GMR) of the conductor arrangement. Since the inductance of a transmission line is inversely proportional to the GMR, bundling effectively decreases the total line inductance.
Bundled conductors consist of two or more stranded conductors connected in parallel per phase, which increases the Geometric Mean Radius (GMR) of the conductor arrangement. Since the inductance of a transmission line is inversely proportional to the GMR, bundling effectively decreases the total line inductance.
L=2├Ч10┬░тИТ7ln(GMReqтАЛDeqтАЛтАЛ) тАФ Inductance per meter of a line
C=ln(reqтАЛDeqтАЛтАЛ)2╧А╧╡0тАЛтАЛ тАФ Capacitance per meter of a line
The inductance of a conductor is determined by the Self GMD (DsтАЛ or GMR). When we bundle n conductors, the equivalent GMR (DsbтАЛ) increases compared to a single conductor, effectively expanding the 'effective radius' of the phase. Mathematically, L=2├Ч10┬░тИТ7ln(GMReqтАЛGMDтАЛ). As GMReqтАЛ increases, the logarithmic ratio decreases, leading to lower inductance and, conversely, higher capacitance.
Bundling increases the Geometric Mean Radius (GMR), which decreases inductance (L).
Bundling increases the effective radius, which increases shunt capacitance (C).
It significantly reduces the voltage gradient at the conductor surface, helping to mitigate corona discharge.
Common in EHV (Extra High Voltage) lines (typically 220kV and above).
Reduced corona loss
Reduced radio interference
Decreased inductive reactance (improved stability)
Increased power transfer capability
Increased wind load on towers
Higher cost of construction
Increased complexity in mechanical design
EHV transmission lines
UHV transmission lines
High-current carrying transmission paths
While inductance decreases with bundling, capacitance actually increases because the effective radius of the conductor increases.
Option A and C are incorrect because bundling increases capacitance, not decreases it.
B is correct тАФ Bundled conductors increase the effective radius (GMR) of the line, which results in a reduction of the line's self-inductance.
Always remember the inverse relationship: bundling increases GMR, which decreases L (Inductance) but increases C (Capacitance).