649 / 2022-03-31 08:52:19

New high conductivity aluminum alloy conductor material design and production process

high conductivity、,aluminum alloy 、,conductor

Uhv (ultra-high voltage) transmission line is the lifeline of the national economy, which is related to the national economy and people's livelihood and national security. Overhead wire is an important carrier of power transmission in Uhv power grid. In this paper, we study a new type of Uhv power transmission in energy conservation and high conductivity aluminum alloy conductor performance, high strength aluminum alloy aluminum alloy core conductive rate from 52.5% to 55.5% IACS, issued to dramatically reduce conductor line loss and helps to build green smart grid.

Experimental/Modeling methods

In this paper, the optimal formula of high-strength aluminum alloy conductor is determined by Taguchi design and analysis, that is, the content ratio of Mg, Si and Fe in the aluminum alloy composition formula, to ensure that the tensile strength of aluminum alloy single wire is 326MPa and the elongation after fracture is 8.0%. The influence of alloy element Er on the conductivity of aluminum alloy wire is analyzed by optical microscope(OM) and SEM scanning metallographic photos. Through simulation, laboratory research and production test, the effects of continuous casting and rolling process parameters (including liquid aluminum temperature, casting temperature, casting speed, cooling water, rolling temperature, exit temperature of aluminum rod, etc.) on the microstructure, conductivity and mechanical properties of aluminum rod were systematically studied.

Results/discussion

The results show that: 1, the aluminum alloy with 0.7±0.02% Mg, 0.5±0.02% Si and 0.4±0.02% Fe content has the best conductivity, strength and elongation. 2. With the increase of the content of Er, the conductivity of the ingots decreases gradually, but the conductivity of the ingots after annealing increases first and then decreases. Considering the addition of alloying element Er in a reasonable range of 0.1-0.15% wt, the conductivity of the conductor can be effectively increased. 3. By improving the continuous casting and rolling process, adjusting the cooling water pressure of 485kPa, casting temperature of 695℃ and strictly controlling the H content below 0.015mL /100g, the conductor performance of aluminum alloy is the best, while increasing the cooling water of the crystallization wheel, refining the grain size of the cast slab after improving the casting cooling strength, and improving the microstructure uniformity of the aluminum rod after rolling. The elongation of aluminum rod is improved.

Conclusions

In conclusion, we studied the design and preparation process of new high-conductivity aluminum alloy conductor material, the effects of different alloying element ratio, rare earth element Er and continuous casting and rolling process on the electrical and mechanical properties of the conductor material. The results show that the alloying element ratio of 7:5:4 and the addition of rare earth element Er are important factors to determine the conductivity of the wire, and the production process of continuous casting and rolling determines the stability of the product.