RITES invites tenders for Railway Electrification work of Existing /Proposed Railway Tracks

RITES Ltd., a Public Sector Enterprise under the Ministry of Railways, acting for and on behalf of M/s. Kamarajar Port Limited (KPL) has invited tender for the work of “Design, Supply, Erection, Testing and Commissioning of Railway Electrification work of Existing /Proposed Railway Tracks including modification of existing 25 kV AC, 50Hz Single phase overhead equipment (OHE) and general electrification works at Holding Yard 1 siding at M/s. Kamarajar Port Limited (KPL)”.

• Tender Reference Number: RITES/BLR/CHN/OHE/2021
• Name of Work: Design, Supply, Erection, Testing and Commissioning of Railway Electrification work of Existing /Proposed Railway Tracks including modification of existing 25 kV AC, 50Hz Single phase overhead equipment (OHE) and General electrification works at Holding Yard 1 siding at M/s. Kamarajar Port Limited (KPL)
• Estimated Cost of Work: INR 9.37 Crores
• Time for Completion: 8 Months
• Document Download / Sale Start Date: 13-Nov-2021
• Document Download / Sale End Date: 01-Dec-2021
• Bid Submission Start Date: 24-Nov-2021
• Bid Submission End Date: 01-Dec-2021
• Bid Opening Date: 02-Dec-2021

Scope of Work:

OHE works:

• Provision of New OHE conventional and Tramway type with modification works under power block including foundation for the OHE mast work.
• Co-ordination with Railway both at Division & Head Quarters level.
• Preparation of OHE layout plan, Sectioning Diagram, CSD, Profile drawings, Sectional Erection drawings/details (SED)/ and other working drawings and get approved from Southern Railway.
• Preparation of “As Erected Drawings” furnishing 6 copies and of RTF for each Drawing after approval.

General Electrical works:

• Supply, Erection, Testing and Commissioning of 30 meters High Mast, providing pile foundations for High Masts, LT Main Power panel, Sub MV panel, Control panels for High Mast. 
• Supply and laying of LT Armoured underground cables, supply, installation, testing and commissioning of High Mast luminaries, providing pipe / plate type earthing.
• Obtaining power supply from TANGEDCO for all the above and commissioning of all the above equipment.

Overhead Equipment:

General:

Design, Supply, Erection, Testing And Commissioning Of Railway Electrification Work of Existing/Proposed Railway Tracks Including Modification Of Existing 25 kV AC, 50 Hz Single Phase Overhead Equipment (OHE), SSP, SCADA and General Electrification work’.

The contractor shall also ensure for above work mentioned as under:

• The TRD work is to be carried out as per ACTM and various guidelines issued by Railway Board, RDSO, CORE, CEE/SR/Chennai from time to time.
• Lay out plan, General power supply diagram and wiring cum sectioning diagram to be approved from Railway before execution of work.
• Taken EIG approval from Railway for fit of train movement.

Track:

• Gauge and Track Centers: The track gauge is 1676 mm in multiple tracks zone the normal distance between tracks centers varies between 4270 mm and 4420 mm.
• Speed: The overhead equipment which shall be of the simple polygonal type and pre-sag should be designed for a maximum speed of 160 km/h if regulated and for a maximum speed of 80 km/h (Approx. 50 miles/h) if unregulated, unless otherwise specified in chapter 8 of Part II.
• Curves: The minimum radius permissible is 175 m (573 ft) i.e. a 10 degree curve. Inside station limits, the curvature at a 1 in 8 1/2 turnout is 8 degree i.e. of radius 219m (716 ft).
• Super Elevation: The maximum super elevation is 165 mm (6.5. inch).On curves, the minimum setting of structures shall be decided on the basis of maximum super elevation. For purposes of design and erection of overhead equipment, the actual super elevation as existing at site or as indicated to the Contractor shall be adopted.
• Low Joints: For low or loosely packed rail joints a difference of 25 mm (1 inch) in the level of opposite rails may be taken as the basis for estimating the displacement of the pantograph with respect to the normal position.
• Formation: Generally sections with more than one track have common formation. In certain lengths, however, the formation for different tracks may be separate.
• Displacement: The general design of overhead equipment shall permit a displacement of ±100 mm of tracks without difficulty and any adjustment of the overhead equipment on this account shall be of such a nature as could be done conveniently without changing any component of the overhead equipment.

Sectioning:

• Insulated Overlap: Insulated overlaps are provided for facility isolation. Some of the overlaps may be provided with manually operated isolator switches.
• Yard Supply: The sectioning diagram/s also indicates the tracks in stations, yards and siding whose equipment is electrically independent from those of other tracks. The overhead equipment in yards and siding may be fed provided as indicated in the sectioning diagrams, or crossover between main tracks and to isolated sections of overhead equipment in yards and sidings. Section isolators may also be used to form neutral sections at special locations as indicated in approved drawings.
• Section Insulators: Section insulators shall be provided as indicated in the sectioning diagrams, or cross-over between main tracks and to isolate sections of overhead equipment in yards and sidings. Section insulators may also be used to form neutral sections at special locations as indicated in the approved drawings.
• 25 KV Track Feeders: 25 KV along track feeders may connect sections of overhead equipment to a switching station or an isolator switch or gantry. Such feeders will be run usually on traction structures and sometimes on independent masts.
  • Schematic arrangements: The different arrangements of feeders return feeders, 25 KV along track feeders and return conductors are shown in the drawing issued by RDSO.
  • Sectioning diagram: The provisional sectioning diagram of the section to be electrified is/are attached.

Pantographs:

• The outline of the pantograph, its dimensions and its current collecting areas are shown in a drawing issued by RDSO.
• Number and Pressure: Each locomotive will be equipped with two pantographs, but only one pantograph; generally the trailing one will be in use at a time. The working pressure of the pantograph on the contact wire may vary between 5 and 15 kg.
• Spacing in Multiple Headed Trains: The distance between adjacent running pantographs in the case of multiple heading would normally be 20 meter. This distance may, however, be reduced to 7.9 meter between two pantographs in very exceptional cases.
• Insulation Clearance: The electrical clearances for the pantograph on tangent tracks and on curves for design and erection of overhead equipment shall be based on the schedule of Dimensions 1676 mm Gauge, 1939 (Revised-2004) issued by the Ministry of Railways (Railway Board).

Overhead Equipment:

• Brief Description: Essentially the traction overhead equipment shall consist of a standard centenary wire from which a grooved contact wire is suitably suspended by means of droppers. 
• Catenary: The catenary wire shall be of cadmium copper 19/2.10 mm, 65 sq. mm cross-section.
• Contact Wire: The contact wire shall be grooved and made of hard drawn copper having 107 sq.mm cross-
• sections.
• Droppers: Dropper shall be made of hard drawn round copper wire, approximately 5 mm dia. Droppers shall be spaced not more than 9 m apart.
• Encumbrance: As a general rule, the nominal “encumbrance” i.e. the axial distance between the catenary and the contact wire at the support shall be 1.40 m. Deviation from this figure will be permitted in special cases (e.g. spans near over bridges, structures with more than one cantilever etc). 
• Jumpers: All jumpers connected to OHE conductors shall be copper only. The in-span jumpers, potential equalizer jumpers at insulated overlaps and neutral section, shall be of 50 mm nominal, 19/1.8 mm size.
• Flexible jumpers of nominal section 105 sq mm, 19/7/1.06 mm size shall be used at overlaps turnouts, crossings etc.
• Bridle Wire: Bridle wire for supporting contact wire for regulated tramway equipment shall be of cadmium copper 7/2.10mm size.
• Anti-theft jumper: anti-theft jumper of 50 sq mm nominal, 19/1.8 mm in size shall be used in out of run wire of conventional OHE and copper cadmium anti-creep wire as an anti-theft measure.

The jumpers connecting the Aluminum conductor to any other conductor terminal or clamp shall be made with the aid of suitable bi-metallic clamps. All aluminum jumpers of size 19/7/1.4 mm bare 3/4 hard shall be used to connect other Aluminum conductors such as return conductor. The tail ends of feeder wires from the strain clamps at the termination of a feeder. Return feeder or return conductor may be connected directly to a terminal or clamp where feasible to avoid the use of a separate jumper wire.

About RITES Limited:

• RITES Limited is a Miniratna (Category-I) Schedule ‘A’ Public Sector Enterprise and a leading player in the transport consultancy and engineering sector in India, having diversified services and geographical reach. 
• Company has an experience spanning 47 years and has undertaken projects in over 55 countries including Asia, Africa, Latin America, South America and Middle East regions.
• RITES Limited is the only export arm of Indian Railways for providing rolling stock overseas (other than Thailand, Malaysia and Indonesia).

Tender documents may be downloaded from CPPP website https://etenders.gov.in/eprocure/app and from RITES website https://www.rites.com.

---

Source: RITES-Tender | Image Credit (representational): MoR