Inclined Span Modelling by a Given Levelled Span for OHL Design

Abstract

An overhead line (OHL) design is more difficult in a hilly terrain than that is in a flat terrain. One of the reasons is presence of inclined spans where the vertical distance between the support points is not zero. The algorithms for calculations in inclined spans are available in literatures but these are more complicated than those concerned to levelled spans. Creating a link between the two span types, the recent paper shows a mathematical solution for modelling an inclined span by given data for a levelled one and a freely selected vertical distance between the support points. This distance defines the span inclination. The method developed is based on the fact that the conductor curves in each span between the two dead–end towers are parts of the same catenary, independently of the span inclination. The main discussion regards to the catenary, but its parabolic approximation is also mentioned.