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Overhead Electrical Conductors
In elementary mechanics textbooks, power lines are generally given as a typical example of a so-called “flexible cable”. However, in the design of these critical elements of a power grid it is often necessary to take into account the conductor bending stiffness, or flexural rigidity. While relatively low compared with a bar having an equivalent solid cross-section, it does have some influence on a conductor response to wind excitation, in particular from the fatigue strength point of view.
Depending on the application, several approaches are available. The attached report is a review of mechanical models based on Coulomb’s laws of friction, where a given layer of a multilayer conductor starts slipping when the conductor centerline curvature reaches a critical value. Originally, these theories were developed for cable applications (such as ropeways).
Attachment | Size |
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Stick-slip_models_OEC_2013.pdf | 1.51 MB |
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