Traction Distribution: Electrification

Showing posts with label Electrification. Show all posts

Thursday, November 8, 2012

Two things that are like heart and brain of OHE

What special do you see here?

Friday, April 8, 2011

Great News For Railway Electrification

Railway Board has issued Blue Print stating to electrify 14000 RKM by 2020. The routes and methodolgy has been elaborated in the document. If implemented it will be a great boost to the entire Indian economy.

Important OHE parameters

Normal height of contact wire at support point :- 5.60 m ( presag of 100 mm ).

Minimum height of contact wire at level crossing : - 5.50 m

Minimum Height of contact wire at overline structure:- 4.92 m Dia of contact wire :- 12.24 mm

Condemned dia of contact wire on main line:- 8.25 mm

Condemned dia of contact wire at loop lines/yard:- 8.00 mm

Stagger of contact wire on tangent track :- +- 200 mm

Stagger of contact wire on curved track :- +- 300 mm

Stagger of catenary on tangent track at support for single cantilever :- 0

Gap between two parallel running contact wires at uninsulated overlap :- 200 mm

Gap between parallel running contact wires:- 500 mm

Height of contact wire of turnout OHE above contact wire of the main line:- 5 cm

Track separationa at turnout and cross overat the location of obligatory structure:-150-700mm.

Minnimum implantion at obligatory structure/mast supporting more than one OHE:-3.

Normal implantation(standard):-2.50m. +, -0.03

Minimum implantation (critical) withCEE approval. :- 2.36m.

Minimum implation on platform : 4.75 m.

Normal encumbrance :-1.4 m.for72m. span

Maximum permisible slope of contact wire on main line:-3mm./mtr.

Maximum permissible slope of contact wire in yards.:-5mm./mtr.

Short time min.vertical electricl clearance:- 270mm.

Short time min. Hozrizontal electrical clearance :- 220mm

Long time min. horizontal eletrical clearance.:- 320mm.

Stagger of contract wire at PTFE neutralsection at support:-0.

Earthing resistance of FOB/ROB/Girders/Bridge/Platform shed & other overlinestructures:-10

Cross section area and length of C jumper wire:-50mm 1.7m.

Cross section and length of F jumper wire :-50mm, 1.6m

Cross section area and length of G jumper wire:-105mm, 3.5m.

Distance of G jumper from obligatory mast towards overlap side-5.6m.

Fixed length of the dropper wire:- 105mm.

The distance of the first dropperfrom support:-2.25m.

Swept zone clearance of section insulator at trailing side:-1.726m

Swept zone clearance of section insulator at facing side:-1.60m

For the section insulator, thedistance between contact wire and runner oneitherside shouldnot be less than:-220mm

Maximum tension length for regulated OHE:-1500

Normal sag of regulated OHE:-100mm.

Maximum span length on tangent track for regulated OHE:-2000m.

ZY valueof winch type ATD at half tension length(750m) at35 c in mm.:-Z =1250, Y =2500

XY value of 3 pulley type ATD at half tension length (750 m.) at 35 c in mm. :- X=750, Y= 2500

The difference in length of adjacent spans on mian line should not bemore than:- 18m

Minimum length of dropper in the span:- 150mm.

In case of overlap type turnout, the turnoutspan should be less than or equal to :- 54m.

With crossed type equipment with actual crossings of OHEs at facing turnouts, the anchor span should be restricted to :- 54 m.

Leaning of mast should be attended if leaning at tope exceeds:- 15 cm.

Some Civil Engineering

TRD officers deal with foundations a lot. Some tips:-

GAD:- General arrangement drawing. It contains PLAN and ELEVATION ( of cross section ) . It contains tentative dimensions.

Structural design:- it for two types:- Load Bearing Structures and Framed Structures ( Combination of columns and beams )

Key Plan:- Roof level ( RB ) , Floor beam ( FB ) and Plinth Beam ( PB )

Schedules of column, beam , slab and footing .

What is M-25 ? It represnts the crushing strength of the Mix ( M stands for mixed ) . Unit is N/square meter. It is measured after 28 days of casting.

What is 1 :2:4 ? It is ratio of Cement, Sand and Aggregate

Components of RCC :- Sheer stirrups ( main reinforcement ), Tie Reinforcement , Clear Cover ( for durability )

What we mean by Bottom Steel 2/16 :- it means 2 nos of 16 mm dia.

Stirrups are usually of 8 mm dia with 100 C/E.

Traction Distribution

Thursday, November 8, 2012

Two things that are like heart and brain of OHE

Friday, April 8, 2011

Great News For Railway Electrification

Indian Railway Electrification

Blog Archive

A picture is worth a thousand words...

Important OHE parameters

Followers

Some Civil Engineering

TRD links

S.O.D

About Me

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Traction Distribution

Thursday, November 8, 2012

Two things that are like heart and brain of OHE

Friday, April 8, 2011

Great News For Railway Electrification

Indian Railway Electrification

Blog Archive

A picture is worth a thousand words...

Important OHE parameters

Followers

Some Civil Engineering

TRD links

S.O.D

About Me

Subscribe To

Total Pageviews