Transmission Lines | Conductor Sagging | Stringing
HTML-код
- Опубликовано: 28 мар 2019
- #Stringing #ACSR #Sagging #SagTension #SagBridge #Compression #TransmissionLine#SagCalculation#Conductor
Earlier I uploaded the construction video on Foundation, Erection and Paying out of Conductor. I got several request from viewers to upload video on Conductor Sagging, this time the video is all about that explained in details.
Once the conductor paying out is over its time to meet the clearance criteria of line which is between the line and ground and between conductors, under maximum load condition. The process of attaining this is called sagging. Let us look in to procedure step by step.
Procedure
1. Let us look into a side view of a tower. We divide it into two a sagging zone and a non-sagging zone. Our first step is holding the conductor in non-sagging zone. 18/20mm wire rope slings is attached to the cross arms. Other end of the sling will be attached to the automatic clamps fixed on conductor. This is done to maintain required rough sag tension in back span during sagging.
2. Let us now move into sagging zone which starts with hoisting of tension Insulator sets with power winch machine. The universal joint of the Insulator string is properly fixed with the tension plate of cross arm.
3. 20 to 25 meter apart from Insulator an automatic clamp is fixed on one conductor coupled with pulley. Steel wire rope one end fixed to yoke plate of Insulator will be passing through pulley coupled with automatic clamp, tower body and tower leg to winch machine.
This arrangement of Pulleys are done to reduce the force given to get the work done
4. Tension on the conductor is applied using power winch machine. Sag Man need to check the dip of the conductor till it coincides with the hairline of Sag scope and sag board.
The span which is nearer to the equivalent span shall be identified as sag span to measure the sag. Atmospheric Temperature reading is noted from a thermometer kept in shade. The sag is checked w.r.t the noted atmospheric temperature from approved sag chart. Sag board are properly installed before taking final sag. Sagging should not be carried out in abnormal climatic conditions.
5. For conductor sagging initial sag and tension chart is referred. It is the sag and tensions at the time the line is built. Final Sag and tension are calculated if the conductor has experienced 10 years of creep elongation at a conductor temperature of 60 degree F.
Overhead conductor elongates with time, temperature and tension thereby changing their original positions after installation. Despite the weather condition and loading on line the conductor must remain at safe distance from any object.
6. Once the Sag is over 6 Ton Pull lift will be attached to the Insulator string with the help of 18/20mm wire rope slings. Other end of the pull lifts will be attached to the automatic clamps fixed on conductor. Once again verify the sag by matching the nodal point of the strung conductor with sag board.
7. Mark the conductor after attaining desired sag level and cut the excess conductor length.
8. Same procedure as said earlier is adopted for the other conductor to attain the desired sag.
9. Before deadening the bundling of conductor need to be checked with total station. This is to ensure that the all sub conductor are on same levels. Any adjustment requires can be done by adjusting the pull lift.
10. Sagging platform is lifted where preparation for conductor will be done.
11. In case steel reinforced conductor upper layer of aluminium need to be removed as per approved drawing dimension. Then the steel deaden is inserted and compressed followed by aluminium.
12. Recording of pre and post press dimension in dead end joint details report is mandatory to detect any flaws.
13. Once the deadening is over connect the dead end joint with tension insulator string and release the load slowly by releasing the load of the pull lift. This brings an end to conductor sagging work.
Now a day’s sag bridge can also be used for more safe operation.
Tips
Sometimes it happens that the conductor is in sag at one check point and it may not be in sag at other sag check point. Then, in that case
a. Check the Sag Calculation
b. Check the temperature
c. Check the heights of Sag Board & Sag Scope
d. Check the Conductor rollers for any friction or malfunctioning
e. Check the span length of each section
Hope you enjoyed watching this video. Please like, share and comment in the comment section below and please do subscribe my channel to get more informative video. This is end for today.
Adieu!!!
More on:
Foundation- • Transmission Lines | F...
Pile Load Test- • Pile Load Test
Erection- • Transmission Lines | T...
Erection- • Transmission Lines I T...
Stringing- • Transmission Lines | S...
Scaffolding- • Scaffolding
OPGW- • UNDERGROUND CABLE | La...
Under Ground Cable- • UNDERGROUND CABLE | La...
Tower Testing- • Transmission Lines | T...
Subscribe:
/ pritamsingharoy 
Наука
More on:
Foundation- ruclips.net/video/W5G2TwDWSnU/видео.html
Erection- ruclips.net/video/vrDC-Dfnnhw/видео.html
Under Ground Cable- ruclips.net/video/armLWFEi8tk/видео.html
OPGW- ruclips.net/video/armLWFEi8tk/видео.html
Pile Load Test- ruclips.net/video/trnrUBUCXGo/видео.html
Scaffolding- ruclips.net/video/5wLxlq6JE40/видео.html
Erection- ruclips.net/video/C-QhkGbxryQ/видео.html
Stringing- ruclips.net/video/4Lje07848bE/видео.html
Conductor Sagging- ruclips.net/video/UsmXO7KNBlc/видео.html
Tower Testing- ruclips.net/video/m0LtgEh5JIc/видео.html
GIS Termination- ruclips.net/video/2fkxS39egdg/видео.html
Shotcrete- ruclips.net/video/lNb8Y4Sux1w/видео.html
Subscribe:
ruclips.net/user/PritamSingharoy
Enjoy Watching!
Very good presentation, Thank you
Very good and informative
Great job boss... Hats off
Hey it’s me Prince Andy and I saw you from Facebook and I also love your channel
Thanks
Good presentation
They make ladder platforms for this. You guys should check them out. Way easier
Very nice video Pritam ji. Got all my doubts cleared
Welcome
Such a tough job!!!!
Boa tarde pra geral
First one to view and LIKE
Thanks a lot. Do share the video if u liked it
How to calculate a number of dumper spacer between the span length, so please help me out of this problem,
Sag board where is used to
Cadeia de isolado
#cheapolearn amazing video, who takes this shooting
Good explanation
What is the meaning of RIGS
How can we calculate the total number is composite insulators with each of phase of EHV transmission line ?
In my experience a "standard" 10 inch diameter porcelain bell in the US was rated 20kV. 69kV used 4 bells, 115kV used 6 bells. Small diameter bells were rated less, typically 7.5 or 15kV.
On dead end structures you usually add one to the string. Every system is different from spec to spec but it's a rule of thumb. We use 3- 8 "bells on 34.5kv and we use 2 on a 12470v line.
Maximu MW capacity of this line and voltage range please share me
But for sag somewhere uses sagboard...how its use during stringing
Check in video i explained it...
On target structure sag board is fixed and on transit structure sag scope is fixed. From transit structure sag man will check the sag till the dip of the conductor coincide with sag board and crosshair line of sag scope
Enjoy watching!!
How the conductor will continue after dead ending?
By installation of Jumper
nice video
#arraf1995
how many KV THIS LINE ????
132 kV
Farad
Can someone explain what is stringing ??
Stringing is a process of installation conductor (cable). Pull conductor cable from a tower to another tower.
10:50 One wrong step and😵😵😵😵😵
I need your help, can you call me , please?
Plz don't use music
Obviously safety for these guys is not an issue! People don't even realize the danger they go through working this way. They shouldn't publish these vids
This is the real truth how in major countries transmission line are constructed. We should appreciate their shear skill and courage. There is nothing wrong in publishing the video instead one should provide some cost effective innovative idea to upgrade the system....
There should be sagging bridge here as a platform for the workers. That is the practice in gulf
Both the practise are displayed.
Bandola