The Developed Analytical Model Used to Evaluate the Dynamic Behaviour of Power Line Conductors

Abstract

The dynamic behaviour of Transmission line conductors is a subject of interest to power line designer. This phenomenon occurs as a result of the aerodynamic effects of vortex shedding that induces a transverse displacement. The behaviour of conductors when subjected to dynamic forces is not completely understood and this has necessitated the need for continuous investigations by researchers. Hence, various analytical, numerical and experimental models have evolved over the years to try and predict the concept of wind-induced vibration on power line conductors. This paper presents the developed analytical model that describes the dynamic response of conductors to the dynamic forces such a wind loading. The model presented, modelled the conductor as a continuous distributed parameters of a beam and this was used to evaluate the dynamic response of conductors. The conductor responses were obtained from the developed transfer function, implemented in a sweep manner to capture the resonance frequencies. A replica scenario of the sweep tests were conducted in the laboratory with the same loading conditions. To validate the model, the test results were compared with the developed analytical model. The comparison showed some degree of agreement.