Thursday, November 8, 2012
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Indian Railway runs on electricity. This blog is for sharing the well organised knowledge base and issues related to the most important infrastructure of railways- Traction Distribution.
Indian Railway Electrification
Approx. 40 % of RKM is elctrified which runs 70 % freight traffic of IR. Total fuel bill of IR is Rs.14000 Crore out of which electric traction bill is Rs. 12000 Crore.
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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.
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.
Followers
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.
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.
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