Refined analysis on cross arm arrangement of a 1 000 kV UHV steel tube tower

Abstract

In order to reduce the probability of damage to the cross arm of a 1 000 kV UHV steel tube tower， the general software TTA and the finite element software ANSYS are used for refined analysis on the internal force of the cross arm. Two cross arm arrangement methods are proposed： one is to reduce the first diagonal member and the other is to reduce the last diagonal member. Moreover， the internal force changes of the cross arm of the strain tower and the straight line tower under the two arrangement modes are compared under the two layout methods， and the reasons of the difference in internal forces are analyzed. Studies have shown that the internal forces of the cross arm on the upper plane in case of the reduced first diagonal member and the last diagonal member are smaller than those under the fully sealed condition； the internal forces of the cross member on the lower plane are larger than those under the fully sealed condition； the overall force of the straight line tower is less than that of the strain tower. Under the first-member-less or last-member-less layout of the cross member on the upper plane， it is suggested to adopt ANSYS finite element to calculate and analyze internal forces on the upper plane under the two arrangement modes； when the cross member on the upper plane of the cross arm is fully sealed， the TTA and the ANSYS share the same calculation results.

Keywords

• transmission line
• uhv
• steel tube tower
• cross arm arrangement
• finite element