India: Six Wind Zones, One Tower Configuration: India reassesses transmission line tower designs for different wind zones considering swing angles and clearances

摘要

In the late 1990s, the introduction of six wind zones in India created expectations that, for optimized designs, different swing angle-clearance combinations would be used for each wind zone. However, studies showed that although the conductor swing angles vary considerably due to wind speed characteristics in each zone, their net impact on the tower configuration and cost are largely offset by a counter variation of conductor clearances. Faced with additional costs, delays in construction and other problems associated with the introduction of multiple tower configurations, India's transmission line designers decided to use the same tower configuration for each voltage class in all wind zones.