Conductor galloping

[Highplains Drifter]

The ones I have installed where made by the Preformed company. They where about 18' long and on spans of 300 ft. I think we installed about six per phase per span.

[MI-Lineman]

We have this problem but their answer is to set more poles in the middle of the spans? It kept the arms and hardware from breakin but I still see the wire gallop a little?

Another problem here is the bell lines galloping and damagin our stuff.

[wtdoor67]

Yeah I've seen and helped install those Preform wraps. I think they somewhat work.

This ought to be a good problem for the Engineering department. Check with other entities and see what their solutions are.

Swampsuck always used Feng Shui. Said that's what they used in Rat Tool, Ill.
Accompanied with some pieces of #6 hung on the wire also.

[twodogs73]

thanx guys, dampers were disussed. what sucks about that is we have about 145 miles of this 336 to dampen. gonna be a long hot summerif we do that. whats amazeing to me is we have trans line thru our system spans 12 to 15 hundred ft on H structures, the wire will move to the sides in a strong wind but never gallop. got to be a better way.

[Highplains Drifter]

thanx guys, dampers were disussed. what sucks about that is we have about 145 miles of this 336 to dampen. gonna be a long hot summerif we do that. whats amazeing to me is we have trans line thru our system spans 12 to 15 hundred ft on H structures, the wire will move to the sides in a strong wind but never gallop. got to be a better way.


I always figure when the bells on a H structure are out of plumb by 18 inches from a side wind it is to windy to work. A real good tool is if you can count all the stars on a Garrison Flag (20’x 38’) the wind is over 30 miles an hour.:D

[wtdoor67]

he said the only thing about galloping he knew was that of a mule. Heh, heh, heh.

[lewy]

Like the others have said, you might have to get your engineers involved so many factors involved, length of spans, sag of spans are just a few. We have had some (small vibration) on our tensioned neutrals (approx 1500lbs), but it goes away when we lash our secondary to it. What ever you do you have some work ahead of you whether you install dampeners or some inter spaced poles as MI said at the places where the galloping is happening

[Pootnaigle]

Ummmmmmm well at least he didnt say he put a saddle on em n rode em till they quit.

[twodogs73]

I work for a little coop; Lane-Scott electric based out of Dighton Ks. Landscape is fairly flat. Even in the flats it bounces, 5 or 6 spans u could stack BBs on them then the next 5 or 6 look like they gonna tear apart. not sure whats gonna give out first the wire or the wood. wire is tied in with armor rod and preforms. Everything on 10ft arms.

[wtdoor67]

If you will google Galloping Conductors you will find some pretty good information on this subject. One with Pacificorp in Wyoming has some pretty good pictures. I forget the co. that makes the device but I gather from the article that they think it works pretty well.

[Pootnaigle]

had it happen on a rural 3 phase line for about 4 spans.Couldnt keep the reclosure in, so we screwed anchors down in midspan and using suspension shoes and fiberglass fish we tied em down with down guys. Looked like hell but it worked. I'm sure spacers wouldhave been quicker and easier but we had none

[climbsomemore]

Those pre-form twist on dampners work pretty well.

Any dampner works by interfering with the frequency of the reflected wave produced once the wire starts to "lift" as the wind blows across is.

Sometimes in open country... when the span lengths are nearly dead even for miles... it's worth the cost to add a pole or two as needed and break up the span lengths...

On Bell they sometimes add a trianguar shaped deal in mid span... But I figured those were going to twist the cable and break ice off. Are those for vibration dampning also?

[Squizzy]

Went to a job one night with a 22kV conductor had come off a pole in a slight valley so that it was hanging about a foot to the side of the insulator. Funny thing was that it was a reasonably calm night and the conductor was vibrating so fast it was a blur in the spot light, first and only time I have seen that happen...

[Squizzy]

Damn Squiz...What did ya do?:confused:
I'd have probably tried to grab that puppy with a switch stick, to settle it down, then watched to see if it started up again.

We hooked it with a switching stick out of a bucket and it made a real funny buzzing sound when it rattled on the stick for a couple of seconds while it settled down and we tied it back in and its still good from all reports...

[Edge]

Seen some interesting shit up in Sask.... you're from there right Smith? or is it BC? anyway.... they got some serious prevailing wind going up there.... so about every 10 structure they drop the center phase down to a second arm and to the other side of the pole transposing the structure.... sometimes they will do it on other conductors as well... it helps with the prevailing wind "lean" as well as gallop... I thought it was an interesting solution.... only saw it on SWER though.... there were always short spans or spacers on the 4 wire...

I'm sure CL can clarify if he wants...


for what it's worth...

Edge

[Edge]

I hope you didn't open a can of worms here. I have never heard of transposing phases for the sake of keeping the phases calm.
I have had to deal with transposing (mostly removing them), but the initial reason for transposing phases was to balance the impedances, of three phase lines and to stop the induction of open wire telephone and telegraph on the same poles. Arizona Public Service still transposed 345 kvs as late as 1974. A 3 phase dead end structure transposing 3 jumpers, and the clearance didn't meet the minimums. What a cluster Flock. Engineering had to totally redesign the towers and we had to add sections while holding the already dead-ended conductors in place.

yeah Steve not trying to open that can of worms.... was talking 'bustion here not highline.... most of the big sky transpositions I worked were removals as well... and they were also mainly for induction purposes.... sorry if I started to take the thread of track... just wanted to and another take on the topic...

dampeners and shorter span lengths will prolly fix the OP's problem...

for what it's worth,

Edge

[Edge]

I'm sure CL can clarify if he wants...
"quote"
Edge.


Ha, Ha, ha, ha, ha, ha.....!!!:D
Canadian LINEMAN....My ASS! Scada boy.:D

You AIN'T a LINEMAN.
NEVER posted ANYTHING in the Linemans forum...On ANY topic.

"canadain lineman" my ass.:rolleyes:

"Some of the best though are weights placed on the conductors at various intervals.":D


Spoken like a True..."Lineman"....You're a JOKE CL...and, ya ain't a Lineman.




then why are you quoting him?

I thought it was a pretty good and timely response to what I posted.... but then again he didn't add any GD political rhetoric... so you got nothing to do but slam him and vainly attempt to bait... stick to the GD topic rat... stick to the topic...

saw some N-S lines down in La. one time the ran head guys from pole to pole every 5th or so they dropped anchor.... I thought it was because of the bog and prevailing wind.... reading this thread makes me think it may have been gallop.... or both...

for what it's worth,

Edge

[wudwoker51]

We have installed a ton of "spoilers" on the T & D lines here in the Midwest for the last 20 yrs or so and they certainly help when the conditions are right for "galloping."