Abstract: In calculation of transmission line windage yaw, the swing angle of suspension insulator strings is influenced by the gravity load and wind load of conductors and its magnitude is related to the arrangements of transmission lines,such as the constraints of neighboring conductor’s hanging points, the span and elevation difference. Based on three different arrangements of transmission lines, including the strain tower-tangent tower-strain tower, tangent tower-tangent tower-tangent tower and strain tower-tangent tower-tangent tower,the insulator string-conductor numerical models of two spans, four spans and six spans were established respectively and the swing angle and horizontal displacement of suspension insulator strings were obtained with simulation by changing the span, elevation difference and wind speed. By comparing the results with the swing angle and horizontal displacement calculated by static mechanical model, the influence of different arrangements of transmission lines on the swing angle of suspension insulator strings are analyzed and respective calculation methods of swing angles are proposed for different transmission line arrangements.

Key words: wind speed, span, elevation difference, swing angle