Influence of Tension Insulators and Bundle Conductors on Sag of Conductors in Substations

Influence of tensile insulators on conductor tensile force is an issue that is still overlooked in detail today. The motivation of this article is to introduce the correct and analytic computational approach, which includes the bundle conductors in symmetrical spans. Bundle conductors are not mentioned in the basic mechanical tension formulas, and therefore some self-made modifications in this manner were not always correctly carried out. Our inclusion of bundled conductors into the state equation of the short span is verified through numerical computations (FEM) in PLS-CADD software. The results are applicable in the substation design, where such short spans with bundled conductors occurs the most. Furthermore, an analysis was carried out to show the line between the long and short span definition.