The Study On The Equivalent Bending Stiffness Of ACSR

The equivalent bending stiffness of the Aluminum Conductor Steel Reinforced(ACSR) is closely related to its static and dynamic characteristics. In this paper the experimental work was conducted on a typical LGJ-300/25 ACSR to study the behavior of the ACSR’s equivalent bending stiffness, and a simplified numerical simulation was proposed for the same ACSR based on the finite element theory.To study the equivalent bending stiffness of typical LGJ-300/25 ACSR, a conductor test apparatus was designed and processed based on a mechanical model. A simplified finite element model was set up for the analysis of the ACSR’s equivalent bending stiffness with BEAM188 and COMBIN39 elements. Two methods’ results were compared and it showed that:(1)The equivalent bending stiffness of ACSR would keep a high value, as the contact zones between strands didn’t slip or slipped weakly with the normal load in a low value. Then it would reduce with the increment of the normal load, while the strand structural integrity weakened, for the contact zones between strands increasing and turning into slipping region. As the normal load arrived at a high value, most of the contact zones between strands occurred obviously slipping and the structural integrity broke down, leading to the equivalent bending stiffness of ACSR coming up to a minimum and keeping the same eventually(With the ACSR’s length and the axial tension fixed).(2)When the normal load remained the same, the equivalent bending stiffness of ACSR increased with the increment of the axial tension. It’s that the slipping of the contact zones weakened when the squeeze between strands became strong(With the ACSR’s length fixed).