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Expanding section ACSR use sparsely coiled aluminum conductor layouters as expanding section .The outside section of wires is expanded for decreasing the strength of the electric field outside the onductors,avoiding the electric corona discharge，decreasing the interference to wireless equipment. The characteristic of the products is of high strength, high anticorrosive capability, lone life span, high quality of the connection and can be produced in great length.

Expanding section ACSR can be used in high voltage transmission lines in altiplano and other places with low construction cost.