- #1
Calvadosser
- 39
- 0
These are questions for electrical engineers involved in electrical power transmission by overhead line and knowledgeable about current practices.
- What catenary sag is normal, under normal conditions of weather and transmitted current?
[obviously the answer will depend on the distance between towers and the voltage. What I want is specific examples. Perhaps as a percentage of the span between towers?]
- Does the sag increase significantly under conditions of extreme hot weather?
[A percentage increase would be helpful. Is it 1%? 10%? 50%?]
- Does the current carried heat the cables to produce significant additional sag?
[Again, a percentage increase would be helpful]
- Is it the additional sag due to heating that limits the current in overhead cables? Or is it, for example, the need to avoid excessive power loss.
- What is the safety factor normally used in designing overhead cable transmission systems?
Thank you for any information.
Martin
- What catenary sag is normal, under normal conditions of weather and transmitted current?
[obviously the answer will depend on the distance between towers and the voltage. What I want is specific examples. Perhaps as a percentage of the span between towers?]
- Does the sag increase significantly under conditions of extreme hot weather?
[A percentage increase would be helpful. Is it 1%? 10%? 50%?]
- Does the current carried heat the cables to produce significant additional sag?
[Again, a percentage increase would be helpful]
- Is it the additional sag due to heating that limits the current in overhead cables? Or is it, for example, the need to avoid excessive power loss.
- What is the safety factor normally used in designing overhead cable transmission systems?
Thank you for any information.
Martin