Stringing Charts For River Crossings

1. मुख्य पृष्ठ
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3. Stringing Charts For River Crossings

• Final stringing charts are prepared on the basis of sag and tension calculations at different temperatures under no-wind condition for a particular proposal as per Annexure-1. These charts give final values of sag and tension which should never be exceeded on a line.
• The stringing should be done as per initial stringing charts which are prepared after taking into account creep correction for the conductors. For earthwire no creep correction is required.
• The stringing charts for river crossings are prepared from anchor tower to anchor tower only.
• Sag indicated in the stringing charts are with respect to higher tower is determined as follows for cases where there is level difference between two towers.
  Sag at span = {2a / L}2 x Sag at particular temperature for crossing span.
  where,
  a = L / 2 + TH / WL
  where,
  L = Crossing span Cm)
  T = Tension at particular temperature under No-wind for equivalent span (kg)
  h = Difference of R.L. of towers, (m)
  W = Unit weight of conductor/Earth wire. (kg/meter)
• For cases where there is no level difference, the value of sag given in the stringing chart for the corresponding crossing span may be adopted