I would like to know what module is needed in tds?ÿ survey pro ?ÿto locate the sag in?ÿan electric line between two poles. I was told that you can locate a pole at each end then the you take measurements that record the vertical angle only. Then when you map it out, it shows the actual sag in the line.
Thank You
I'm running Survey Pro 5.2.1.?ÿ The main menu has a "remote elevation" function that might fit your needs.?ÿ
I have never used it.?ÿ We use a reflectorless TS to record all conductor clearance elevations.
vertical angle offset
take a shot on power pole 1 with a prism pole of known height, record shot, turn to the conductor above that shot, shoot and record.
do the same at the lowest sag
do the same at the other power pole 2
this will give the elevation of the conductors
take and record the ground shots first, this will give the ground elevation, subtract the ground elevation from the conductor elevation thus you have the height above the ground
Use reflectorless and shoot it directly- if no reflectorless sort thru the various offset routines - I think it??s the angle offset- I don??t have it home in front of me right now
This was a trick question, and all of you missed it.?ÿ The real answer:?ÿ you don't locate the sag in an electric line between 2 telephone poles.?ÿ They're telephone poles, so there are no electric lines between them.
Now, if you want to talk about joint utility poles or power poles, well, that's a different matter.
This was a trick question, and all of you missed it.?ÿ The real answer:?ÿ you don't locate the sag in an electric line between 2 telephone poles.?ÿ They're telephone poles, so there are no electric lines between them.
Now, if you want to talk about joint utility poles or power poles, well, that's a different matter.
it doesn't say telephone poles.....
This was a trick question, and all of you missed it.?ÿ The real answer:?ÿ you don't locate the sag in an electric line between 2 telephone poles.?ÿ They're telephone poles, so there are no electric lines between them.
Now, if you want to talk about joint utility poles or power poles, well, that's a different matter.
it doesn't say telephone poles.....
The OP has been edited, it did say telephone poles originally.
Depends.
How many chickens are roosting on it? (Arkansas Mississippi specific)
How many tied together tennis shoes are hanging on it? (California Arizona in particular, but New York, and New Jersey too now)
And, what about orange balls, to warn aircraft?
N
I think the function is plane and offset?ÿ
Might be edited- Can??t tell ?ÿ based on the appearance of the site on my iPhone- I can??t check from my laptop, because of the good ole?? http400 bad request bs when I click on the post
The OP has been edited, it did say telephone poles originally.
If it had been edited after posting, it would have that fact added below the post.
Like this:
I'll chime in here in spite of all the nitpicking and point out when measuring power line sag it's important to note the time observed and local weather?ÿ because the load the line is carrying heats it up (aluminum).?ÿ The power company can dial in the load and accurately estimate the worst case sag condition (hot day, no wind, maximum transmission load).
Don't believe me??ÿ The effect can be observed by the naked eye.?ÿ Observe a line span on a cold winter day with?ÿ wind and low power transmission.?ÿ It's practically bow tight.?ÿ Next summer, observe the same span on a hot day with no wind and maximum power load, it's practically scratching cow's backs.
Don't believe me??ÿ The effect can be observed by the naked eye.?ÿ Observe a line span on a cold winter day with?ÿ wind and low power transmission.?ÿ It's practically bow tight.?ÿ Next summer, observe the same span on a hot day with no wind and maximum power load, it's practically scratching cow's backs.
The trees you're using as a reference in the background have grown since the winter, making the line seem lower. ?ÿ ??ÿ
It's a catenary. ?ÿThat's what you get when your pet canary eats your pet cat.
?ÿ
https://en.wikipedia.org/wiki/Catenary
Scan it.
N10,000, E7,000, Z100.00
PLS - IL, MO, AR, KS, MN, KY
This is so exciting; I can actually afford an opinion!?ÿ I was the hired forensic surveyor in a situation where a military helicopter dropped low into a canyon, cut a powerline and caused a fire which?ÿ caused major damage to private property.?ÿ The crux was he was too low, proved by my?ÿ survey which showed?ÿ even at?ÿ maximum line tension?ÿ there was no way he should have gone below the lines safely according to airflight maps.?ÿ
Since it was forensic we did the big survey and recorded every line balllup,?ÿ debris fields,?ÿ likely fire startups, pole damage, etc.?ÿ Got paid for two weeks work, $22,000 bucks.?ÿ Everybody accepted our?ÿ survey as the facts,?ÿ so the payoff was in the millions; I made my bucks?ÿ by simply providing the facts.?ÿ
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HC mentioned the term "catenary" in his post and I thought I would add?ÿsomething I was a party to some time back.
A few years ago a?ÿyoung and very smart facility engineer with a power company took some of my field observations and?ÿcompared them to a calculated sag with some of their high-brow software.?ÿ Predictably the calc'd sag and the field data were very much congruent?ÿto one another.?ÿ The differences were usually in the hundredths of a foot; acceptable in the real world; and?ÿfew exceeded a tenth or so.?ÿ
At first?ÿwe chalked these up to the error found in observation and left it at that.?ÿ But the engineer checked a number of instances and found some differences that appeared to him to be in predictable spots.?ÿ Over a period of time he continued to scrutinize the differences.?ÿ?ÿ Of course he was far more interested in this than I was.?ÿ From time to time he would call me and pick my brain about field procedures and the equipment until he discovered his "aha" theory.
As in all mathematical formulae we depend on "constants".?ÿ Some of the initial "fixed" values utilized by his software was (of course) the beginning and end of the sag.?ÿ He found the field data and calc'd sag could better corroborate each other by?ÿ"fixing" the mid span values and allowing the formula to solve for the end points.?ÿ The differences were not outside of?ÿacceptable error, but did show me some haunting predictability.?ÿ The sags were always a little longer than I reported and the "attachment" elevations wound up a little higher.
He brought some typical attachment hardware out to a site and we compared what I was looking at through the TS and what was really going on.?ÿ It was a good learning moment and eye opening for both of us.
Long story short, the beginning and end of a catenary sag are critical point and possibly more critical to the observations than the sag shots taken along the conductors.?ÿ The hardware varies greatly with the type and size of the conductor.?ÿ The "beginning" and "end" of a sagging span needs to be located just as precisely as mid-span points, if not more so.
Lived and learned.
The manual is quite useful for explaining Survey Pro's nuances.
https://www.trimble.com/globalTRLTAB.asp?nav=Collection-67418
[Survey] [Plane and Vertical Angle Offset]
The Plane and Vertical Angle Offset screen allows you to define a vertical plane by measuring distance and angles to
two points, and then store any number of points on that plane by measuring angles only to those points. A common
usage of this routine would be to measure the location of two power poles with a prism or reflectorless observation, and
then observe the power lines between the poles with angles only.
Scan it.
Taking a sledgehammer to a nut surely!