bgannon
Electrical
- May 16, 2012
- 1
I am performing analysis for a client(small local owned utility) on a 115kV line they built in 1970. they want to swap their existing ADSS or SW for OPGW or higher fiber ADSS. My task is to evaluate whether or not the structures can withstand the (small) increase in loading. I have modeled the structures using LiDAR, batch thermal calculator for finite element tensions, and old P&P's. Many of the DE structures which have head and back guys to support single sided conductor are failing. The PLS CADD model shows that the pole itself (all class 1 DF) are buckling.
What were the NESC strength requirements for 1970? I believe that the strength factors applied today are going to be much lower than they were in 1970, hence the calculated failure by today's standards(not even taking into account age and line decay).
Has anyone worked with this before?
What were the NESC strength requirements for 1970? I believe that the strength factors applied today are going to be much lower than they were in 1970, hence the calculated failure by today's standards(not even taking into account age and line decay).
Has anyone worked with this before?