T-line Design
T-line Design
(OP)
I'm working on the pole line design with (2) 69KV and 35kV underbuilt, does anyone have exp or know any website so I can access to get some additonal info. All I have is the standard RUS guidelines which I could follow. My thinking is 2-69kV circuits back to back and 35kV circuit approx 9 below the bottom 69kV circuit. I believe the 35kV circuit can be on crossarm (to save on pole height). What are other advantages/disadvantages between crossarm vs. horizontal post insulators on 35kV ckt. The conductor will be 795ACSR. What other factors should I keep in mind when design such a pole. It is very crowded, and usually with this design, I expect that the span is very short with 200' or less.
Any help is appreciated.
jt
Any help is appreciated.
jt






RE: T-line Design
Is the lower voltage (35KV) distribution?
RE: T-line Design
Determining the most economical span length is always a balancing act. Increasing line tension may reduce phase spacing and pole height/class, but add to the cost of line angles. The 200' sounds short, but for wood poles you are probably real close.
RUS guidelines and standards may be conservative, but I have not much better. I think it is a good resource. BPA used to have a great transmission line manual, but I don't know if it is still available.
RE: T-line Design
Thx
jt
RE: T-line Design
If you are using SYP, I don't think 70-H1 or H2 will be a problem. The taller and larger class poles are harder to come by, more so with DF or WRC. I remember trying buy some 115-H4 WRC in the early 80s. They said they could do it, but never did find them in the forest, so we bought steel poles.