Stressing Analysis of Fittings under Random Wind Load

With the increase of running mileage of the line, the frequency of failure and fracture of power fittings increases under the action of strong wind. In this work, the mechanical model of transmission lines is established firstly, and the time-history curve of wind speed is simulated by harmonic superposition method, and the wind speed is converted into wind load, and the most dangerous load is found. The whole refined solid model of suspension insulator string is established, and the stress characteristics of suspension insulator string under the most dangerous load are calculated by numerical simulation method. The calculation results show that the random wind has a more prominent influence on fittings, and it can be seen that influence of dynamic wind load on some fittings deserves attention. In the overall model, the power fittings that are prone to fracture and damage are ball-end banging rings, right-angle hanging plates and clamps. Combined with the calculation results of this work, the key fittings are regulatory checked during the later period of line operation to ensure the safe operation of line.