Modal Behavior Analysis of 220kV Transmission Line Tower using SAP 2000 in Wind Zones I and V

For every developing country, Electrical system plays a crucial role not only in developing the Nation’s economy but also in survival of human beings. The present study deals with a typical 3 Dimensional 220 kV double circuit transmission-line tower is modelled using Sap 2000. The loading conditions considered are normal, earthwire broken and conductor broken conditions. The wind zones I and V are considered since wind zone I has the lowest wind speed 33m/s and for wind zone V having wind speed 50 m /s (Visakhapatnam). All the other parameters like steel sections, height of tower and base width of tower is kept constant for studying the results after the analysis is done. After analysis of tower corresponding wind zones, the results are compared for maximum axial positive and negative deflections, reactions at the supports, different mode shapes and time period, modal mass participation factors, modal participation factors for modal stiffness and frequencies, Eigen value.