Overhead transmission line conductors are manufactured in stranding machines whose design affects the strains and stresses involved in forming the strands into helices. The residual stresses following stranding influence the handling characteristics of the finished cable.

Stranding machines fall into two general classes relative to these stresses: rigid-head on one hand, and planetary and tubular stranders on the other. This monograph analyzes the geometry of conductor design, and then derives the strains and stresses due to manufacture in these strander types, leading to equations for the residual moments and torques in the strands of the finished conductor.

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