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The effect of wind pressure is more predominant on
Transmission lines
Neutral wires
Insulator
Supporting towers
Supporting towers
Wind pressure exerts a significant lateral force on the large structural surface area of supporting towers compared to the conductors or insulators. Because towers possess a much larger projected area against the wind and are designed to provide mechanical stability, they are the primary components subjected to substantial bending moments due to wind loads.
Wind pressure exerts a significant lateral force on the large structural surface area of supporting towers compared to the conductors or insulators. Because towers possess a much larger projected area against the wind and are designed to provide mechanical stability, they are the primary components subjected to substantial bending moments due to wind loads.
FwтАЛ=P├ЧA├ЧCdтАЛ тАФ Calculation of wind force on structural members
P=0.00473├Чv2 тАФ Empirical relation for wind pressure in kg/m2 where v is velocity in km/h
The wind force on a structure is defined by F=P├ЧA├ЧCdтАЛ, where P is wind pressure, A is the projected area, and CdтАЛ is the drag coefficient. Since the tower surface area (AtowerтАЛ) is significantly greater than the projected area of transmission line conductors or individual insulators, the resulting force F is overwhelmingly dominant on the tower structure.
Wind load is a critical parameter in the design of tower foundations and lattice structures.
The drag coefficient (CdтАЛ) varies based on the geometry of the tower section (e.g., lattice vs tubular).
Transmission line sag is also affected by wind, but the structural stress is highest on the support tower.
Structural design of overhead transmission lines
Evaluation of maximum span length
The wind pressure acting on transmission lines is typically considered as acting perpendicularly to the span.
Neutral wires have the smallest diameter and lowest surface area, thus experience minimal wind force compared to towers.
D is correct тАФ Supporting towers have a significantly larger surface area, making them the primary component to withstand total wind pressure in overhead power systems.
Always remember that while conductors experience wind-induced vibration (Aeolian vibration), the static wind force is overwhelmingly a structural concern for the tower foundation and integrity.