Pulling Conductor - Transmission Line

AI Thread Summary
The discussion focuses on the feasibility of using existing pulling equipment to handle a 795 drake conductor, double bundled, across 16 spans with an average span of 674 feet. The pulling equipment has a safe working load of 4000 lbs, while the maximum sag tension is 4441 lbs. It is suggested that pulling both wires simultaneously could exceed the equipment's capacity, especially considering energy losses and friction at each tower. Calculations should account for varying tensions due to the number of spans and temperature effects. Consulting with the ground-crew foreman and utilizing resources like EPRI for software assistance is recommended for accurate load calculations.
Jarmstro
Messages
2
Reaction score
0
I need to figure out if my companies pulling equipment can handle a 795 drake conductor (about 1 lb/ft) double bundled (times 2). The pulling equipment has a safe working load of 4000 lbs.

We are pulling it across 16 spans with a average span of 674 feet. the towers are 115' tall. Max sag tension is 4441lbs. If we pull at 50% sag tension, will the equipment be able to safely handle the load of 10,557 total feet of conductor? I understand tensions will vary with temperature, I just need an approximation.

How does the tension on the pulling equipment vary as the total length of wire is pulled and also how does tension vary with the number of spans this pull has (more tension for only 1 span as opposed to 16 spans?)

It has been a long time since I have done load calculations. Can anyone refresh my memory?
 

Attachments

  • pulling equipment.jpg
    pulling equipment.jpg
    10.7 KB · Views: 539
Engineering news on Phys.org
Go ask the ground-crew foreman. I'll bet he has done it often enough to have intuition and conservative rules of thumb, otherwise he would have been fired for breaking things.
 
Pulling in both wires at same time is over 4000 pounds assuming your sag tension is 4000 pounds per individual conductor, or 8000 pounds for the bundle. 50 % pulling ten would be 4000 pounds round numbers, plus energy losses over the rollers, plus any line angles in the pull would create additional problems.
 
Thanks guys! This helped!
 
If you must do this by calculation, give some really serious consideration to the friction developed at each tower. The longer this thing gets, the more friction there will be and this is likely to be your undoing.
 
Contact EPRI (electric power research institute). I would not be surprised if they don't have a software program for those calculations that you could use. The utility you contract with is likely an EPRI member.
 
Hi all, i have some questions about the tesla turbine: is a tesla turbine more efficient than a steam engine or a stirling engine ? about the discs of the tesla turbine warping because of the high speed rotations; does running the engine on a lower speed solve that or will the discs warp anyway after time ? what is the difference in efficiency between the tesla turbine running at high speed and running it at a lower speed ( as fast as possible but low enough to not warp de discs) and: i...
Thread 'Where is my curb stop?'
My water meter is submerged under water for about 95% of the year. Today I took a photograph of the inside of my water meter box because today is one of the rare days that my water meter is not submerged in water. Here is the photograph that I took of my water meter with the cover on: Here is a photograph I took of my water meter with the cover off: I edited the photograph to draw a red circle around a knob on my water meter. Is that knob that I drew a red circle around my meter...

Similar threads

Back
Top