م.صلاح المطري Admin
عدد المساهمات : 86 نقاط : 229 تاريخ التسجيل : 13/12/2013
| موضوع: المقصود ب sag الإثنين ديسمبر 16, 2013 7:27 pm | |
| Sag: Is defined as the vertical distance between the point where the line is joined to the tower and the lowest point on the line. The sag is as a result of the tensioning of the line and must not be too low otherwise the safety clearances may not be met. Also, the sag had to be such that it caters for ice loading in the winter of temperate climates. If the sag is large, and the line becomes heavily loaded, then the sag will further increase and breach the safety clearances. Similarly, if the sag is low, then when the line contracts in the winter, a low sag will indicate a high tension, and as a result of this contraction, the line may snap. Sag is inversely proportional to the tension of the line, and is given by the formula below. For high tensions, the sag should be small. For low tensions, the sag should be high. Span is the horizontal distance between two towers
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