- #1
adiy
- 3
- 0
Hello everybody,
I have a question and I am wondering if you can help me find an answer. The problem I am trying to figure out is:
I have 400 miles of 345 kV transmission line. An outage happened twice in two different locations on the line caused by two different lightning strikes, a 35kA and 23kA. Although the withstand ability of this line according to T-Flash –a program we use to model existing structure for lightning performance- is 195kA.
A common factor in both outages is that they were near the splice point (the splice point is where the static wire comes down the pole from both sides to splice the two wires together). We run the static wire down the pole because the static wire we have on this line has fiber optics wiring in it for communications purposes. Also keep in mind, that we have a very good grounding- 20 to 25 Ohms.
So what I am suspecting is the outage must have something to deal with the static wire going down the structure. I forgot to mention that we have a jumper cable on the top of the pole to connect the static wires together. So do not be confused about what I mentioned earlier regarding the splice point- this is only for the fiber optics connections.
I appreciate your help.
Thank you,
I have a question and I am wondering if you can help me find an answer. The problem I am trying to figure out is:
I have 400 miles of 345 kV transmission line. An outage happened twice in two different locations on the line caused by two different lightning strikes, a 35kA and 23kA. Although the withstand ability of this line according to T-Flash –a program we use to model existing structure for lightning performance- is 195kA.
A common factor in both outages is that they were near the splice point (the splice point is where the static wire comes down the pole from both sides to splice the two wires together). We run the static wire down the pole because the static wire we have on this line has fiber optics wiring in it for communications purposes. Also keep in mind, that we have a very good grounding- 20 to 25 Ohms.
So what I am suspecting is the outage must have something to deal with the static wire going down the structure. I forgot to mention that we have a jumper cable on the top of the pole to connect the static wires together. So do not be confused about what I mentioned earlier regarding the splice point- this is only for the fiber optics connections.
I appreciate your help.
Thank you,