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Country Discussion Topics
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OK Line Man Power Line worker's here is a Question
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Willy-N    Posted 10-08-2003 at 18:29:10       [Reply]  [No Email]
I think I know the answer but what is your take. I was asked why when they wire the poles do they cross the lines as they go down the line from pole to pole? I said I thought it was to stop the poles from shakeing so much in the wind by them not all being on the same side when there are more than 3 being strung like on a 3 phase run. Being when jerked by the wind it would pull on the oppitsit side of the next pole. What is the correct answer? Mark H.


Willy-N Answer    Posted 10-09-2003 at 09:04:32       [Reply]  [No Email]
This is what I found for a answer.
"Transposition"
The interchanging of positions of conductors along a transmission line to reduce inductive influence and power loss.
Mark H.


deadcarp    Posted 10-09-2003 at 07:46:37       [Reply]  [No Email]
okay what's this? i used to make dip-brazed aluminum electronics chassis - had all kindsa slots & holes & keyways on the front and slotted dividers all thru them - and the boss compared those holes to gears, said juice travels around a wire not thru it and spacing etc was critical so the juice coming to them would mesh right. that make any sense or was he just maybe trying for a precision panel?



Bob    Posted 10-09-2003 at 07:30:08       [Reply]  [No Email]
The term is "transposition", or "transposition of phases". It's apparently done to balance the impedence of the 3 phases, and for cancelling out EMF's. Do a search on google for "power line transposition", or "phase transpostion"... about 50,000 "hits" to check out!


Willy-N Thanks    Posted 10-09-2003 at 08:44:44       [Reply]  [No Email]

I found what you are talking about. Now I unserstand the twisting of the wires more. Mark H.


Charles(Mo)    Posted 10-09-2003 at 03:59:27       [Reply]  [No Email]
Mark, I reread your post and have a question. Are you talking about verticle construction? 3 phases going down the side of a pole? If so, and the wires are attached to the left side on one then the right side on the next and so on. This is probably done to keep the poles from leaning because of side strain from the weight of the lines. Not to much of a problem in the summer. But when the ground get saturated and the lines have ice on them, you have pretty good conditions to lean the pole.

In my earlier post, I was refering to cross arm construction. And when I read your post about rotation, I thought you were saying that the lines were crossing from pole to pole.

Charles


Les    Posted 10-09-2003 at 04:16:47       [Reply]  [No Email]
When I was in Florida, I notice that almost all of the construction is vertical, especially anything new. They seem to be getting away from x-arm construction. They also are going to concrete poles. Sheesh, those must be expensive.
We sometimes us laminated poles in special situations. In fact we are using some right now in making a new river crossing where the river was washing out the old structures (H-frame).


Charles(Mo)    Posted 10-09-2003 at 04:51:08       [Reply]  [No Email]
On three phase, we use cross arm const. And we use the green poles. We use steel poles in some cases. We just set 2 steel poles day before yesterday on a river crossing.

How are the trees looking up there? They are really pretty around here this week. Shame they don't last but a couple of weeks.

Charles


Les    Posted 10-09-2003 at 12:20:48       [Reply]  [No Email]
Color is coming in good right now. Close to peak. The oaks are all still green but just about everything else is changing...maples, ashes, birches, etc.


Charles Weyand    Posted 10-09-2003 at 03:32:22       [Reply]  [No Email]
Mark, I am not sure if this is what you are talking about, but on 3 phase lines, the lines are rolled when they go to an angle pole. Normally with your back to the substation, looking at the line leaving the sub, you have a b c left to right. When you come to an angle steep enough to have a vertical, they are atached to the pole b a c, and then they go back to a b c. This is to keep the lines seperated at a proper distance. I know of a couple of places where the lines are rolled to c b a from an angle. But it is kinda rare.

On 3 phase accounts such as saw mills, the rotation has to be checked on the customers side so we can hook it up properly. The motors used in the mills and the large heat systems are what require the proper phase placement. I don't know a lot in this area.

But staight in line poles, I can't imagine why the lines are crossed. I think that would be impossible.

hth
Charles


Willy-N    Posted 10-09-2003 at 06:52:24       [Reply]  [No Email]
The more I think of it quite a lot of our poles I look at around here are on the hills and angles. When I go to town again I will look more closely at them and see. The systems I am talking about is where there is one wire on a top insulator and a insulator sticking out each side forming a triangle. Not the wireing method of a strait cross arm across the top of the pole. Mark H.


Les    Posted 10-08-2003 at 18:52:24       [Reply]  [No Email]
That's a new one on me. I never heard of such a thing. How would anybody know which was A, B or C phase on any particular pole if that was the case? It would be right near impossible to keep track of. We certainly don't do that where I work. At least not intentionally. I have heard of a place or two where there is a "roll" in the phases.


Willy-N    Posted 10-08-2003 at 19:55:44       [Reply]  [No Email]
Yes roling the Phases. We use a Phase Rotator to phase our panels when we set them. I have seen the rolling of the wires around here quite a bit? Maybe another reason like elimination of excess EMF problems? When they pull wires on the poles around here they use different colored rope red, blue & black on the 3 phase over head HV Lines. Mark H.


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