Evaluation of Tensile Strength of ACSR Conductors Based on Test Data for Individual Strands

A probabilistic, numerical method for evaluating tensile properties of aluminum conductors, steel reinforced (ACSR) is developed. Analysis of data from routine-production tests performed on individual aluminum and steel strands enabled establishing the shape of the distribution, degree of truncation, and statistical parameters of the diameter, breaking force, and breaking stress. Modeling the mechanical behavior of individual strands allowed to investigate the tensile properties of completed ACSR: to estimate the parameters of the breaking tensile force and characteristic strength with a given exclusion limit; to study the convergence of the simulated empirical distribution toward the theoretical normal distribution; and to establish a correlation between the breaking tensile stress and the ratio of aluminum-to-steel cross-sectional area. Results from numerical simulations show concordance with the IEC and ASTM standard specifications