Ohe in Indian Railways N Dmrc
Chapter-14
Comparative salient feature of OHE of DMRC & Indian Railway
15.1 IMPORTANT DMRC OHE PARAMETERS (Rail Corridor)
S.N. | Parameters | Specification as per DMRC | Specification as per Indian Railway | 1 | Normal height of contact wire at support point for regulated OHE | 5.00 mtr (Presag -1000th part of span length) | 5.50 mtr | 2 | Normal height of contact wire at support point for unregulated OHE | 5.15 mtr | 5.70 mtr | 3 | Minimum height of contact wire at loco inspection pit | 5.20 mtr | 5.80 mtr | 4 | Minimum height of contact wire at over line structure | 4.80 mtr | 5.50 mtr | 5 | Dia of new contact wire | 13.8 mm | 12.24 mm | 6 | Condemned dia of contact wire on main line | 9.25 mm | 8.25 mm | 7 | Condemned dia of contact wire on loop lines/ yard lines | 9.00 mm | 8.00 mm | 8 | Stagger of contact and Catenary wire on tangent track | ± 200 mm | ± 200 mm | 9 | Stagger of contact and Catenary wire on curved track | ± 300 mm | ± 300 mm | 10 | Gap between two parallel running contact wires at uninsulated overlap | 200 mm | 200 mm | 11 | Gap between parallel running contact wires at insulated overlap | 500 mm | 500 mm | 12 | Height of contact wire of turnout OHE above contact wire of main line OHE | 5 cm | 5 cm | 13 | Track separation at turnout and crossover at the location of obligatory structure | 22 to 84 cm | 24 to 84 cm | 14 | Minimum implantation at obligatory structure/ mast supporting more than one OHE | 3.00 mtr | 3.50 mtr | 15 | Normal implantation ( Standard ) | 3.60 mtr ( At Grade ), 2.87 mtr ( At Via Duct) | 2.50 mtr | 16 | Minimum implantation on Gantry | 4.30 mtr | 3.75 mtr | 17 | Normal encumbrance | 90 cm | 140 cm | 18 | Maximum permissible slope of contact wire on main line | 3% | 3mm/mtr | 19 | Maximum permissible slope of contact wire in yards | 10% | 5mm/mtr | 20 | Short time minimum Vertical electrical clearance | 270 mm | 270 mm | 21 | Short time minimum Horizontal
Comparative salient feature of OHE of DMRC & Indian Railway
15.1 IMPORTANT DMRC OHE PARAMETERS (Rail Corridor)
S.N. | Parameters | Specification as per DMRC | Specification as per Indian Railway | 1 | Normal height of contact wire at support point for regulated OHE | 5.00 mtr (Presag -1000th part of span length) | 5.50 mtr | 2 | Normal height of contact wire at support point for unregulated OHE | 5.15 mtr | 5.70 mtr | 3 | Minimum height of contact wire at loco inspection pit | 5.20 mtr | 5.80 mtr | 4 | Minimum height of contact wire at over line structure | 4.80 mtr | 5.50 mtr | 5 | Dia of new contact wire | 13.8 mm | 12.24 mm | 6 | Condemned dia of contact wire on main line | 9.25 mm | 8.25 mm | 7 | Condemned dia of contact wire on loop lines/ yard lines | 9.00 mm | 8.00 mm | 8 | Stagger of contact and Catenary wire on tangent track | ± 200 mm | ± 200 mm | 9 | Stagger of contact and Catenary wire on curved track | ± 300 mm | ± 300 mm | 10 | Gap between two parallel running contact wires at uninsulated overlap | 200 mm | 200 mm | 11 | Gap between parallel running contact wires at insulated overlap | 500 mm | 500 mm | 12 | Height of contact wire of turnout OHE above contact wire of main line OHE | 5 cm | 5 cm | 13 | Track separation at turnout and crossover at the location of obligatory structure | 22 to 84 cm | 24 to 84 cm | 14 | Minimum implantation at obligatory structure/ mast supporting more than one OHE | 3.00 mtr | 3.50 mtr | 15 | Normal implantation ( Standard ) | 3.60 mtr ( At Grade ), 2.87 mtr ( At Via Duct) | 2.50 mtr | 16 | Minimum implantation on Gantry | 4.30 mtr | 3.75 mtr | 17 | Normal encumbrance | 90 cm | 140 cm | 18 | Maximum permissible slope of contact wire on main line | 3% | 3mm/mtr | 19 | Maximum permissible slope of contact wire in yards | 10% | 5mm/mtr | 20 | Short time minimum Vertical electrical clearance | 270 mm | 270 mm | 21 | Short time minimum Horizontal