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If the height of transmission towers is increased, which of the following parameters is likely to change ?
Resistance
Inductance
Capacitance
None of the above
Capacitance
Increasing the height of transmission towers increases the distance between the overhead conductors and the ground. This change in physical geometry alters the shunt capacitance of the transmission line, which is defined by the arrangement of conductors relative to the ground plane.
Increasing the height of transmission towers increases the distance between the overhead conductors and the ground. This change in physical geometry alters the shunt capacitance of the transmission line, which is defined by the arrangement of conductors relative to the ground plane.
C=ln(r2hтАЛ)2╧А╧╡0тАЛтАЛ тАФ Capacitance of a single conductor to ground where h is height and r is radius.
IcтАЛ=VтЛЕ2╧АfC тАФ Charging current dependent on line capacitance.
The capacitance of a transmission line is calculated based on the permittivity of the medium and the geometric configuration of the conductors with respect to the earth (ground). As tower height increases, the ground appears further away, effectively decreasing the shunt capacitance C=ln(2h/r)2╧А╧╡тАЛ, where h is the height of the conductor above ground. Thus, physical height modification is a direct parameter affecting the line's electrostatic properties.
Capacitance is a shunt parameter formed by the potential difference between conductors and the ground.
Higher towers lead to reduced capacitance to ground.
Inductance is primarily determined by the loop area between conductors, which is less affected by tower height compared to capacitance.
Resistance depends on the conductor material, cross-section area, and temperature, independent of tower height.
Higher clearance improves safety and prevents flashovers.
Reduced ground capacitance can influence the charging current of the line.
Increased tower height leads to higher costs and structural loading requirements.
Taller structures are more susceptible to wind loads and lightning strikes.
Design of high-voltage transmission networks.
Right-of-way planning in urban environments.
Resistance is R=╧БALтАЛ, which depends on material and length, not height.
Inductance L is a series parameter determined by flux linkage and conductor spacing, largely independent of ground height for overhead lines.
C is correct тАФ Increasing the tower height changes the geometric configuration relative to the ground, which alters the electrostatic shunt capacitance of the transmission line.
Always remember that shunt parameters (Capacitance and Shunt Conductance) are affected by the environment and ground geometry, while series parameters (Resistance and Inductance) are primarily internal to the conductor and their mutual arrangement.