Tag Archives: catenary

Raising a crossarm

If you modify an existing span by raising or lowering the crossarm on one end of the span, what changes occur to the tensions? Power lines are modelled as catenary curves. “Although commercially available wires and cables are not truly flexible, they will, in very short spans, conform closer to a catenary than to any

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Level vs inclined spans

What difference does uneven attachment heights in a span make to tension? We can approach this issue by comparing tensions in two spans identical except for the vertical height difference. Equations are from AS/NZS7000:2016 For this worked example the spans have these common properties: Krypton conductor, weight 0.433 kg/m Conductor breaking load 37.4 kN 60m

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