Application Prospect of Extended Diameter Conductor in UHV AC Large Capacity Transmission Projects

In this paper the design principle, development and current application situation of diameter-extended conductor for UHV AC power transmission projects are presented. Taking 750 kV power transmission demonstration project from Guanting to East Lanzhou for example, the electrical characteristics, mechanical performances of diameter-extended conductor and conventional conductors as well as their environmental protection features are compared in detail. Practical application and comparative analysis results show that as for a developing component for power transmission and distribution the diameter-extended conductor can fully meet the requirements in the aspects of electrical operation and mechanical performance and it can also measure up to the standard of environment protection, meanwhile, it can also bring economic benefits. Application of diameter-extended conductor in UHV AC power transmission project incarnates the guiding principle of construcing environment-friendly and resource-saving power grid, so it possesses wide extension and application prospect.