Over Head Equipment – Cantilever
Cantilever hold the assembly of contact wire , catenary and dropper assembly. It transfers all vertical load, lateral forces and bending moment load through insulator to Mast. It is an insulated swiveling type structural member and keeps the overhead catenary system in a position assisting smooth current collection by the pantograph at the designed speed. It is flexible with all joints having swiveling arrangement permitting movement in all direction.Material is so chosen to avoid any rusting and to last the life the OHE (35-40 years)
There are four tubes which makes the complete cantilever assembly namely
Stay Arm: It comprises of dia 28.4/33/7 mm (Small) size tube and an adjuster at the end to keep the bracket tube in position. It is insulated from the mast by stay arm insulator.
Bracket Tube: It comprises of dia 40/49 mm (Small) or dia. 30/38 mm (standard) bracket tube and insulated by bracket insulator. Catenary is supported from this member by catenary suspension brackets and catenary suspension clamp
Register Arm: It comprises of dia 28.4×33.7 mm tube to register the contract wire in the desired position with the help of steady arm
Steady Arm: It is 32 x 31 mm BFB section made of aluminum alloy to register the contact wire to the required stagger and to take the push up of contact wire. It is always in tension
Dropper is a fitting used in overhead equipment construction for supporting the contact wire from catenary. Two top tubes hold the weight; adjust the height and center of the Contact and catenary wire assembly whereas the bottom two tubes for adjusting the contact wire – stagger/height.
Contact and catenary assembly is designed for following different applications namely, push, pull, overlapping, crossover etc. The arrangement of the cantilever depends upon the height of the contact wire, encumbrance, setting distance, stagger and super elevation.
Stay and Bracket tube is supported on the mast with the help of insulator for electrical isolation called Stay Tube Insulator and Bracket Insulator. Two standard sizes of tubes 38mm and 49mm outside diameter are used for bracket assembly depending on the loading condition. Bracket assembly permits adjustment of equipment to cater for slewing or raising of track during maintenance. Length of stay tube can be varied by as much as 9 cm. in either directions and bracket tube is provided with free length of 10 cm beyond the caternary suspension clamp. Similarly projection of the register arm beyond the steady tube clamp is kept at 15 cm. This makes it possible to adjust the stagger of OHE at later stage without much difficulty.
Most important feature of Cantilever assembly is its flexibility, swiveling in all direction to take care of vertical push during movement of pantograph and expansion during change of ambient temperature and Vertical and Horizontal adjustment.
sir, gd mrg, the current collection video is very very good. And the articles on TRD OHE is easy to understand // thanx very much sir,
pl provide an article on PT entanglement, remedial measures and 2 to 3 case studies..
nmr
Hello sir,i am OHE design enginer,General how we will decide drop arm implantation(i mean calculation)…?
Single bracket/ cantilever assembly suitable for tramway type OHE including St by insulator
OHE supervisor
Pls explain me Span wise dropper length calculated formula (All Encumbrance)
If you want know how much droppers provides between two mast?
This is very easy, first you major the span between two mast then divide the span by 9 then + 1,
Ex-if spn is 45 then 45(spn)/9=5(then +1)=6
Which dropper is near from mast that is the A dropper, (we mention droppers like A dropper, B dropper, c dropper)
A DROPPER distance 6.75 m, B dropper distance 4.45 m, c dropper 2m
tq sir given this information
Good facility
I am pradeep kumar patel
Railway electrification Ohe line supervisor banana chahata hun
Mo.no.7988472574
Very use full
Excellent please make to download in PDF format… Then it will be very helpful for learning…
hello greeting of the nigt .
I am railway contractor ,basically
I want to assambeling the cantilever in western railway
So will you providw the product to me
I am sorry. I don’t have information on this subject. You may visit RDSO/RE(core) website to get the information on the approved sources of cantilever assembly.
Ohe
Learn
Good morning sir, can you please give me the abbreviations of these terms used in designing and execution of Indian Railway Projects.
PTW, LOP, SED, ESP, ACTM, RRA, ODC, IOL, UIOL, ACC, FTA, MRL.
Thanks sir.
PTW: Permit to Work; LOP: Layout Plan; SED: Structural Erected Design; ESP: Engineering Scale Plan; ACTM: AC Traction Manual; ODC: Over Dimensional Consignment; IOL: Insulated Overlap; UIOL: Uninsured Overlap; As regards other, I don’t have the information.
RRA – Raised Register Arm, ACC – Anti Creep Centre, FTA – Fixed Termination Anchor, MRL – Main Rail Level
ACC ANTICREEP CENTER
MRL:- main rail leval
Bracket fabrication and dropper making all completely work
St tube majerment system bol Denge to thora help hota
Sir, explain me about 3 kV returning in traction electrification.
Thank you sir
What materials 6351 ohe railway
Learn design and drawing
Hi sir i want learn ohe work can you suggest me any book, video
You tube Chanel.
I don’t think any such information is available on line
Vikas Yadav
We have an Urgent opening of Sr Purchase Engineer for one of the leading Manufacturing Industry.
Position : Sr. Purchase Engineer
Company : Manufacturing OHE Railway
Location : MP
Salary : 5-7 Lacs
Interested Candidate Contact Nitin Sharma 9810956473
ACC ANTICREEP CENTER
MRL:- main rail leval
Sir, I am a SSE in ELectrical-G dept, am preparing for my AEE LDCE 30%. To qualify in paper-I I need some electrical material, so sir can you suggest me some website in which I can get all the syllabus materials easily . I shall be very much thanksfull for this.
You will not get any material from the website for preparation of LDCE. I have summarised the way how to prepare for LDCE group B post and the only way to succeed in the examination. There is no short cut for sure shot success. Visit https://www.railelectrica.com/job-opportunities-in-rail-transport/group-b-services/.
Sir, I want to about ,how Cantilevers assembled as, below
Imp=3.20m,
Then, what length stay tube, what length bracket tube,and what length registered tube,
What formula ,
So please send me mail id
IMP-3.20(for example) bracket tube=10 cm add , stay tube= 1m minus (-)
Hi,
I am looking for buying BFB steady arm and related materials,can any one advise a supplier?,Thanks.
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