Creep studies on Pheasant, Narcissus and Chukar aluminum conductors Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/0k225f82p

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  • This thesis is an engineering report on the creep behavior of power transmission line conductors. Laboratory creep test results are reported for Pheasant, Narcissus and Chukar conductors. The report follows a standard nomenclature and format suggested by the International Study Committee No. 6 of Conference Internationale des Grands Reseaux Electriques (C. I. G. R. E. ). A theoretical introduction to conductor creep describes mechanical and metallurgical factors. The mechanical factors of conductor stranding are less well understood and less predictable than metallurgical factors. The creep studies include trial of several prestressing techniques, long time creep tests of 10,000 and 20,000 hours, and stress-strain tests for modulus of elasticity determinations. Conductor creep data are extrapolated mathematically to 1, 10, 30 and 50 years. Results from the creep studies are summarized as follows: 1. An initial stress-strain loading produces more uniform subsequent creep behavior than does prestressing at normal times and tension levels. 2. The creep factor F is related inversely to the slope n for all conductor types, manufacturing practices and prestressing techniques for conductors that have been studied in the laboratory. 3. Creep strain for conductors is related inversely to nonelastic elongation during prestress and is not related to prestress tension or prestress time. 4. Stable period behavior following an initial stress-strain test gives graphic support to the theory of anelastic recovery. 5. Conductor hysteresis is caused largely by mechanical stranding factors. Creep is a minor factor. 6. Creep reduces the nonelastic elongation produced by wind and ice loading.
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