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Span sensitivity to snow accretion and snow shedding in an overhead line tension field
Zemljarič, Borut ; Jakše, Janez
Like in the other parts of Europe in Slovenia as well the distances between phase conductors and a ground wire in the middle of the span are designed according to their disposition and sags. Field ...experiences show that during periods of snow some lines can be exposed to short circuit events if upper andlower conductors lie in a vertical disposition. In this paper we would liketo clarify why such short circuit events occur if the line is designed according to national legislation. A basic study of the line geometry and a calculation of static conductorsć sags for different loading cases showed us that some spans were more vulnerable to snow accretion and snow shedding. We considered different conductor types hanged in multi span tension fields with different span lengths. Then we implemented different load cases and calculated sags in those tension fields. The results confirmed our expectations that some spans were more vulnerable to snow shedding than the others in a non-linear way.
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