Finite Element Analysis Of Transmission Line Pole And Optimization Of Foundation Structure

Pole and its foundation as the important part of the transmission system directly affect the security and reliability of transmission line performance. The life and property of people are hugely loosed because of pole cracking down or lying on the ground or power outages. Poorly designed infrastructures seriously endanger the transmission secure of transmission lines. Pole and base as the system are currently little researched and analyzed at home and abroad. In this paper, taking the icing load for example, we have investigated the effects of environmental loads on poles and infrastructure, and have also explored(rectangular, stepped, tapered) three different pole foundation forms of the stress distribution under reinforcement and unreinforcement. This article’s analysis provides a new thinking for other condition pole systems, and the research can provide valuable reference for the pole and its foundation in practical application.The finite element software MSC Marc is applied to reinforced concrete poles which are 110 kV voltage grade and poles foundations for numerical analysis. Firstly, MATLAB software programming is used for the pole calculation and discussion of the impact of wire tension under the suspension lines height difference and ice thickness in transmission line model, then the maximum value of the wire tension is obtained in the icing and not icing; secondly, 45 degree angle pole, rectangular bar, straight bar are inspected for their stress and deformation, and more dangerous pole is got; additionally, the more dangerous pole in the icing is analyzed to obtain the maximum equivalent stress and the maximum supporting force of this pole’s bottom; finally, we have designed(rectangular, stepped, tapered) three forms pole infrastructure for their stress distribution, then the result is analyzed under the supporting force of pole’s bottom and soil binding around the pole foundation with or without reinforcement, so the form of preferred infrastructure is obtained.The results show that suspended line’s altitude difference both ends of the wire more greatly impact the wire tension, and the maximum value is got when the wire height difference is zero, the tension of wire suspension point significantly increased with the increased of wire ice thickness; 45 degree angle bar’s equivalent stress is larger than the linear pole and Right Angle bar, and its supporting reaction force at the bottom of pole is the largest, but the three poles stress values in the wire tension are much less than the yield limit stress of the material; wire icing has a greater impact on pole’s stress and supporting force of pole’s bottom; when the icing thickness is 15 mm, the maximum equivalent stress increased by 75%; when the foundation has reinforced, the stress of concrete part is greatly reduced; the step shape is a better structure form of pole foundation.