GOVERNMENT OF INDIA MINISTRY OF RAILWAYS …rdso.indianrailways.gov.in/works/uploads/File/336kw_final draft_27... · GOVERNMENT OF INDIA MINISTRY OF RAILWAYS vuqla/kku vfHkdYi ,oa

Page 1 of 54 DRAFT RDSO/PE/SPEC/AC/0084-2008(REV.”1”) DRAFT

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GOVERNMENT OF INDIA MINISTRY OF RAILWAYS

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RESEARCH DESIGNS AND STANDARDS ORGANISATION

SPECIFICATION FOR 336 KW DIESEL ALTERNATOR SET

FOR POWER CAR

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RDSO / PE / SPEC. / AC / 0084-2008 (Rev ‘1’)

S.NO. Details of Amendment

Revision Page Number

Reasons for amendment

1. Complete spec. revised 1 Nil Revised as per field requirement

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APPROVED

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INDEX

S. No Description Page no.

CHAPTER No 1

1.0 Forward 3

1.1 Scope 3

1.2 Scope of supply 3

1.3 Governing specification 3

1.4 Service requirement 4

1.5 Test and performance 9

1.6 Guaranty / Warranty 12

1.7 Infringement of patent rights / ISO 9000 accreditation 12

1.8 Cartel formation 13

1.9 Marking & packing 13

1.10 Training 14

1.11 List of spares and list of special tools 14

1.12 Drawings to be submitted for approval 14

1.13 QAP to be followed 15 CHAPTER NO.2 Technical requirement of diesel engine 16-23 CHAPTER NO.3 Technical requirement of alternator 24-33 ANNEXURE-A Schedule of technical data sheet to be furnished by the

manufacturer along with the tender and type test for diesel engine 34-39

ANNEXURE-B Schedule of technical data sheet to be furnished by the manufacturer along with the tender and type test for alternator

40-44

ANNEXURE-C1 Schedule of technical data sheet to be furnished by the

manufacturer along with the tender and type test for radiator system/ventilation system

45-46

ANNEXURE-C2 Schedule of technical data sheet to be furnished by the

manufacturer along with the tender and type test for ventilation arrangement for engine room.

47-48

ANNEXURE-D List of drawings and specification 49

ANNEXURE-E Undertaking for cartel formation 50

ANNEXURE-F Fire retardant test 51

ANNEXURE-G Format for quality assurance plan 52-53

ANNEXURE-H Noise level mapping sketch. 54


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CHAPTER-I GENERAL DESCRPTION

1.0 FORWORD The power supply system with axle generation has limitations for services where the electrical requirement is very high. For such trains, the system of end on generation with diesel engine driven sets mounted in power cars at the two ends of the train has been evolved and selectively adopted on the Indian Railways. At present, Rajdhani Expresses, Shatabdi, and Garth Rath services are provided with End-On-Generation (EOG) system.

Presently the rakes of Rajdhani / Shatabdi express trains are working on end –on- generation system of power supply and are provided with two power cars each fitted with two DG sets of 336 KW each.

1.1 SCOPE 1.1.1 This specification covers supply, assembly, installation, commissioning, performance, testing

requirement of Diesel Alternator set of electrical power output 336 KW, 750 Volt AC, 3-phase, ventilation system, instrumentation, protective devices and accessories, including fuel pipe line, water pipe line, engine air intake pipeline, exhaust piping etc in High Capacity Power Car.

1.1.2 This specification supersedes the Section-II of RDSO specification no. ELPS / SPEC. / EOG /

02 issued in Nov.1994. However the DA set will meet General functional requirement for diesel engine and alternator system for power car as per the specification for EOG / ELPS / SPEC. / EOG / 02 issued in Nov.1994.

1.2 SCOPE OF SUPPLY Manufacturer / supplier shall supply the DA set along with items as per Bill of material

(BOM) given in clause no 2.13 & 3.11. Control panel shall be supplied as per RCF specification EDTS : 103 (REV. ‘D’) or latest revision. Manufacturers shall ensure that engine supplied to Indian Railways must be complying to latest applicable CPCB norm for emission on the date of supply.

1.3 GOVERNING SPECIFICATIONS: 1.3.1 Following standards, regulations as far as they can appropriately be applied to the coaches for Indian Railways shall be applicable. IEC : 60571-1998 or latest Rules for electronic equipment used on the rail vehicles.

IEC : 61373 Railway application- Rolling stock equipment- shock & vibration test.

IEC :349 Rotating electrical machines for rail and road vehicle.

IEC :101 Rules for auxiliary machines on motor vehicles.

IEC : 61000 series Electromagnetic compatibility (EMC) Pt. 4, testing and measurement


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technique-section 4. Electrical test transient/burst immunity test.

BS : 5514 Part-I-1996 & ISO 3045-1 1995 or latest

Reciprocating internal Combustion Engine performance Part-I standard reference condition de-ration. of power fuel and lubricating oil consumption

and test methods.

BS : 5514 Part-3-1990 & ISO 3045-3 1989 or latest

Reciprocating internal combustion engine part-3 specification for test measurements.

BS : 5514 Part-4-1997 &

ISO 3045-4 1997 or latest

Reciprocating internal combustion engines part-4 speed governing.

BS : 5514 Part-5-1979 &

ISO : 3045-V 1978 or latest

Reciprocating internal combustion engines part-5 for torsional vibration.

BS : 5514 Part-6-1992 & ISO : 3045-6 1980 or latest

Reciprocating internal combustion engines part-6specification for over speed protection.

BS : 5514 Part-7-1996 &

ISO : 3045-7 1995 or latest

Reciprocating internal combustion engines part-7 Code for engine power.

IS: 10000-1980 Pt-9 or latest Methods of tests for internal combustion engine (Endurance test).

IS : 4722-2001 or latest Specification for rotating electrical machines.

IS : 7132-73 or latest Guide for testing synchronous machine.

IS : 7306-74 or latest Methods for determining synchronous machine from tests.

IS : 4889-68 or latest Methods of determining of efficiency of rotating electrical machines.

IS : 1460-2001 or latest Automotive diesel fuels.

IS : 13730 Pt-13 or latest Particular types of winding wires part-13 polyester or polyester-amide over

coated with polyamide-amide enameled round copper wire clause 200.

ELRS/ Spec. / ELC / 0019

(Rev.2) or latest.

E-beam halogen free cable with copper conductors.

RDSO spec. ELPS / Spec. / EOG / 01 or latest

Spec. and code of practice for wiring in 750V EOG system coaching stock.

RDSO specification no. ELPS /

spec. / EOG / 02 Nov., 1994

Specification for broad-gauge high capacity power car for 750 V EOG

system.

IS : 13847-1993 Pt-I or latest Specification for low voltage switchgear and control gear – Pt-1, general

requirements.

IS : 13778-1993 Pt-1 - 6 or latest

Method of test for winding wires thermal properties.

IS : 1239 Pt-2-1982 or latest Mild steel tubes, tubular and other wrought steel fitting of Pt-2 mild steel

tubular and other wrought steel pipe fittings.

IS : 649 or latest Stator and rotor stamping.

IS : 7624 or RDSO

specification

Lead acid battery for starter battery.

Note: Latest version of the above specifications/standards shall be applicable and shall be available with the manufacturer before commencing the prototype type test. 1.4 SERVICE CONDITIONS: The generating sets fitted in power car shall be suitable to operate continuously under following varying climatic conditions existing throughout India normally encountered on the Indian Rolling Stock:


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1.4.1 Environmental Conditions: - Minimum ambient temperature : - 5 ° C - Maximum ambient temperature : + 55° C - Humidity : : 95% - Altitude : Max.1200 metres above sea level. - Atmosphere : Extremely dusty foggy, desert weather. The dust contents in

the air may reach as high as 1.6 mg / meter³ - Annual rain falls : Very heavy in certain areas between 1750 to 6250 mm. The equipment shall be designed to work in coastal area, humid salt laden and corrosive atmosphere. The maximum values of the condition shall be as under: - Maximum pH value : 8.5 - Sulphate : 7 mg / litre - Max. Concentration of chlorine : 6 mg /litre - Max. Conductivity : 130 micro Siemens /CM I.4.2 Train Speed : 200 Km/hr max. 1.4.3 Vibration & Shunting Shocks: The coaches are expected to run upto a maximum speed of 160 km/h and is planned to be increase up to 200 kmph in future in varying climatic conditions existing throughout India. DA set as well as all accessories to be mounted on the coach shall be designed to withstand service vibrations and buffing shocks. i) Maximum vertical acceleration : 3 g ii) Maximum lateral acceleration : 3 g iii) Maximum longitudinal acceleration : 3 g (corresponding to shunting shocks) (“g” being the “value of acceleration due the gravity) 1.5 GENERAL REQUIREMENT:

1.5.1 The Diesel Alternator set shall consist of approved make diesel engine coupled with an approved make alternator both mounted on suitable common base frame.

1.5.2 The diesel alternator set shall generally conform to the details indicated below:

Electrical output power of diesel engine-

alternator set at site condition of 55 deg C

Minimum 336 KW


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ambient and 200 m altitude

System Voltage & Frequency 750V, AC, 3 phase & 50 Hz ± 3%

Power factor 0.8

Arrangement and mounting of DA set shall confirm to RCF drawing no. 1 11012 0 89 300

001 and 1 11012 0 89 300 002. Overall dimension of DG set shall be within the envelope as

being used presently. Weight of complete DA set system including radiator should not be

more than 4500 Kg.

1.5.3 Suitable anti-vibration mountings of proven design with cast steel top bearing plate as

recommended by the supplier shall be provided between the mounting base frame and the

coach under frame at mounting location to absorb the continuous vibrations and shocks

encountered during service. The supplier shall furnish the design calculation for the base

frame together with selection of AVMs before fabrication to achieve following conditions.

Vibration level measurement in all three axis x, y & z at front and rear foot of diesel engine

and alternator shall be taken as per ISO : 8528 pt. -9 or IS 4729

1.5.4 The firm shall submit the following drawings along with the offer:

i. All three views of DA set with radiator placed in the coach and with footprint on the coach floor.

ii. Silencer assembly with fitment of the roof on coach.

1.5.5 The proposal of the DA set supplier shall be acceptable after having validated the offer by RCF validation using computer simulation etc.

1.5.6 The DA set should be compact, robust and light in weight.

1.5.7 The firm shall make his own arrangements for welding sets, welding rods and welders for fabrication work to be done suit for commissioning at site.

1.5.8 Two sets of maintenance and operation manuals shall be supplied free of cost separately with each diesel engine and Alternator set.

1.5.9 Once a prototype approval for a make, type and rating of the diesel engine and alternator has been granted, based on the type tests results, the design of the same shall not be changed without the specific and written approval of RDSO. In the event of any of the parameter that have bearing on the performance, deviating from the type values, beyond the permissible tolerance, RDSO reserves the right to repeat the type tests.


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1.5.10 A certificate to the effect that after sales service will be rendered for diesel engine and

alternator at all the cities where EOG trains originate along with the name, address and telephone nos. of the service personnel shall be furnished. This information shall also be included in the maintenance manuals.

1.5.11 The firm shall furnish complete information as per Annexure -‘A’ for the diesel engine and Annexure-‘B’ for the alternator along with detailed design documents.

1.5.12 The firms shall furnish detailed drawings of radiator indicating the overall and mounting dimensions and other details to facilitate installation of the radiator separately. Technical particulars of the radiator like minimum air flow required through the radiator at 55º C (ambient), its total heat rejection capacity shall also be furnished.

1.5.13 The engine electrical schematic wiring system with the details of components used (protections, solenoids contractors, switches, gauges etc.) shall be submitted by the firm.

1.5.14 The interlocking system schematics along with wiring diagram with functional description of the complete system shall be submitted by the firm.

1.5.15 Calculation for adequacy of diodes selected with their characteristics shall be submitted for the approval by the firm.

1.5.16 The harness specific to the control switchgear required for the DG set shall be supplied by the manufacturer. Cable shall be e-beam irradiated copper cable as per RDSO specification no. ELRS / SPEC. / ELC / 0019 (REV-2) - Feb., 2011 with latest amendment / revision and shall be of approved make of RDSO.

1.5.17 Cable shall be crimped at both ends with suitable lugs. Heat shrinkable PVC transparent sleeve of RDSO approved make shall be provided over all the lugs and joints so that sleeves do not dislodge.

1.5.18 Computer generated cable markers of reputed make shall be provided for identification of cables.

1.5.19 Clearance and creepage distance shall be maintained as per IS : 13947 (latest).

1.5.20 The firm shall associate during testing and commissioning of the DA set and its interface with the switchboard cabinet in the power car.

1.5.21 The equipments working above 110V supply shall be provided with danger plate as per IS : 2551.

1.5.22 Earthing symbol plate shall be provided at all the locations.


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1.5.23 Electronic components, if used, in diesel engine or alternator or elsewhere shall confirm to IEC : 60571.

1.5.24 The diesel- alternator set is also capable to work on 110 % over-load for one hour once in 12 hour period of operation under service conditions prescribed above.

1.5.25 Engine shall require only indigenous lubricant oil.

1.5.26 Soft copies of design details, Circuit diagrams, detailed drawings of diesel engine and alternator, type test results, field trial reports, drawings in auto cad should also be given along with hard copy.

1.5.27 Ventilation equipment and Panel filter for power car shall be tested as per Annex C - 2

1.5.28 All component used in DA set assembly shall be fire retardant.

1.5.29 All pipe lines i.e. fuel, lube, coolant etc should be properly clamped and secured.

1.5.30 Noise reduction features ( Optional): RCF/ICF may decide to go for power car with reduced noise level as compared to present. Present level of noise mapping is enclosed in Annexure - H. In such a case firm shall submit details of noise reduction measures for prior approval of RDSO / ICF / RCF. DA set layout shall be in such a way that minimum noise is transmitted outside the power car in the platform area. Firm shall reorient / redesign radiator motor, ventilation system, provide acoustic panel and use residential silencer to achieve noise reduction. Acoustic material used shall be fire retardant. Noise level shall be measured as method prescribed in ISO : 8528 pt.- 10 fig - 4.

1.6 TESTS AND PERFORMANCE:

1.6.1 General

a) DA set prototype shall be done by the Engineers of RDSO & RCF at the works of the manufacturer. After successful type testing and commissioning of DA set on power car, it will put under extensive field trials for six months.

b) All type tests mentioned in table A & B in clause 2.12.2 and 3.10.2 shall be carried out on

Diesel engine and alternator at the works of the manufacturer.


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c) Any defect noticed / design improvement found necessary as a result of these tests / trials shall be carried out by the manufacturer in the least possible time.

d) All the system to be supplied against the tender shall incorporate without any extra cost, all

the modifications carried out in the first type tested unit after the field trials of the system. e) All expense on labor, material and fuel during the type test, acceptance test &

commissioning test shall be borne by firm.

1.6.2 TYPE TESTS:

The proto type test shall be undertaken either totally or in part on DA set as per clause 2.12 & 3.10 under the following conditions without any additional cost:

a. A manufacturer undertakes to manufacture for the first time as per this specification.

b. A new variant of engine or alternator is introduced by existing manufacturer.

c. A fundamental change in design is introduced and modification of equipment likely to

affect its function.

c. Failure or variations established during type test.

d. Resumption of production after an interruption of more than two years.

e. Specification is amended or revised.

1.6.3 ACCEPTANCE TEST:

All acceptance tests mentioned in table A & B in clause 2.12.2 and 3.10.2 shall be carried

out on Diesel engine and alternator by an inspecting authority nominated by the purchaser

at the works of the manufacturer.

1.6.4 ROUTINE TEST:

Routine tests mentioned in table A & B in clause 2.12.2 and 3.10.2 shall be carried out on Diesel engine and alternator by the manufacturer at his premises to ensure compliance with the specification and the drawings.

1.6.5 SPECIAL TEST ON COMBINED DIESEL ALTERNATOR SET DURING PROTOTYPE APPROVAL:

1.6.5.1 Firm should have a test bed for complete DA set along with radiator and ventilation arrangement simulating power car condition. Following test shall be conducted on combined set of diesel - alternator under following condition:


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i) 100 % load with radiator in un-choked condition.

ii) 100 % load with radiator in 30% choked condition.

iii) 110 % load with radiator in un-choked condition.

iv) 110 % load with radiator in 30 % choked condition.

v) Measurement of Speed (RPM) of Engine.

vi) Measurement of alternator Currents, Voltage, Power of DA set (KW in all 3-Ø).

vii) Measurement of Frequency (Hz).

viii) Measurement of Specific fuel consumption (gm/kwh).

ix) Measurement of main Lube oil Pressure (kg / cm2).

xi) Measurement of inlet & outlet temperature (deg C) of lubricating oil.

xii) Measurement of inlet & outlet water temperature (deg C) of coolant engine.

xiii) Measurement of inlet & outlet air temperature of Radiator.

xiv) Measurement of exhaust temperature.

xv) Calculation of torque.

1.6.5.2 ENDURANCE TEST:

Endurance test shall be conducted on DA set on test bed for 96 hours (6 cycles of 16

hours each). DA set shall be loaded in each cycle as per clause 2.1 of IS : 10000 pt-9.

1.6.6 COMMISSIONING TESTS:

1.6.6.1 These tests are to be conducted after commissioning of DA sets in Power car at

production units i.e. ICF / RCF. These tests shall comprise of following:-

a) Full load test at specified BHP for minimum of 3 hrs.

b) Temperature rise in Engine room at full load over ambient till stabilization.

c) Power and control connection sequence test.


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d) Checking of bill of material as per specification.

e) Tuning of Engine RPM and alignment

f) Vibration level at base rail with the help of strain gauges/transducers

g) IR and HV test

h) Phase sequence test

i) Functional / operational aspects of each sub-component as well all protection test.

j) Engine room ventilation in terms of air exhaust through ventilation fans.

k) Checking of sealing of Radiators, Fresh air filter, ventilation fan bellows, and

proper tightening of screws etc. and mechanical interfaces.

l) Visual inspection and checking quality of workmanship

m) All protection of engine and alternator shall be verified

n) Test on panel filter as per Annex C2 clause 2.3.

o) Working of fuel flow meter.

Firm shall make complete booklet of these test conducted on first power car jointly

signed with concerned Electrical Production unit of ICF/RCF and shall send the

commissioning report to RDSO. For Subsequent DA set it should be submitted to CEE

of PUs.

1.6.7 The alternator and diesel engine shall be tested at ambient condition. However, the test

results shall be extrapolated to on site condition to check the compliance to declared

parameters.

1.7 GUARANTEE / WARRANTY: 1.7.1 Guarantee/warranty obligation of the equipment shall be as per IRS condition of contract.

1.7.2 The supplier shall be responsible for carrying out all the modifications at his cost on any

part of the equipment during the period or warranty required for satisfactory operation of

the equipment as per technical specification. For any technical decision the final authority

from the purchaser’s side is RDSO.

1.8 INFRINGEMENT OF PATENT RIGHTS:


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Indian Railways shall not be responsible for infringement of patent rights arising due to

similarity in design, manufacturing process, use of similar components in the design &

development of this item and any other factor not mentioned herein which may cause

such a dispute. The entire responsibility to settle any such disputes/matters lies with the

manufacturer/ supplier.

Details / design/documents given by them are not infringing any IPR and they are

responsible in absolute and full measure instead of railways for any such violations.

Data, specifications and other IP as generated out of interaction with railways shall not

be unilaterally used without the consent of RDSO and right of Railways / RDSO on such

IP is acceptable to them.

1.9 ISO 9000 ACCREDITATION:

The firm seeking RDSO’s approval for manufacture and supply of diesel alternator set conforming to this Specification shall have ISO : 9001 accreditation to ensure its conformance to quality systems laid down in the standard for design and manufacturing processes at different stages.

1.10 CARTEL FORMATION

The firms shall not engage in cartel formation with other firms and will also submit a

declaration in this regard as per Annexure - E attached.

1.11 MARKING & PACKING

1.11.1 The Diesel - Alternator shall be provided with suitable name plates, on which the following

shall be marked / engraved:

a) Manufacturers name and trade mark.

b) Rated capacity of the machine (alternator KVA/Diesel engine BHP etc.).

c) Voltage and current rating.

d) Class of insulation.

e) Weight of alternator / Diesel Engine / Radiator.

f) Engine must be affixed with a conformance label meeting the following requirements


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i) Statement that “this engine conforms to the environment (protection) rule 1986”

ii) Type approval certificate number

The label shall be affixed on part necessary for normal operation of the engine and not

normally requiring replacement during the life of the engine.

1.11.2 The serial number of the machine shall be marked/engraved/ embossed as under:-

First two digits : Year of manufacture

Next two digits : Month of manufacture

Next two / three digits: No. of machine manufactured in the particular Month e.g.

Serial No.08 02 0001 denotes machine manufactured in

February 2008 with Serial number of 0001.

1.11.3 The equipment and its sub assembly shall be packed with wooden box of sufficient

strength and the empty space shall be filled with suitable filling material. Before keeping

in the box the equipment shall be wrapped with thick bubble sheet.

1.11.4 Manufacture shall provide a screen-printed schematic diagram of power and control

circuit at suitable place.

1.11.5 Manufacturer shall provide printed DO’s and Don’t Do’s

1.12 TRAINING:

The supplier shall arrange for training to Indian Railway personnel in maintenance and

trouble shooting of the system supplied. Ten man-days training in operation, maintenance

& trouble shooting aspects will be provided. The supplier will provide detailed technical

write-up to all the trainees. The syllabus for training will have to be approved by the user/

purchaser. The venue of training will be mutually agreed. Training will be arranged free of

cost.

1.13 LIST OF SPARES AND LIST OF SPECIAL TOOLS:

The Firms shall submit recommended list of spares for diesel alternator set and list of

special tools if required any.

1.14 Apart from details as per Annexure A, B , C1 & C2 , following documents shall

also be submitted to RDSO for approval before type test:

1.14.1 Diesel engine:


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a) General description of diesel engine with the list of protection devices, gauges and

sensors.

b) Heat balance diagram and heat load calculation.

c) Lube oil circulating diagram.

d) Radiator water circulating diagram.

e) Detailed drawing of radiator indicating the overall and mounting dimension.

f) Air duct design details and drawing to avoid back turbulence.

g) Details of electronic governor including circuit diagram.

h) Anti vibration mounting design details with calculation.

i) Design calculation for base frame with detailed drawing.

j) Starter battery selection calculation.

k) De-ration calculation for engine at site conditions.

l) Any other design related details.

1.14.2 Alternator

a) Diagram of electrical connections together with assembly drawing showing full

particulars of Exciter / stator and numbers of turn, sections, weight and length per coil. b) Circuit diagram of AVR. c) Shaft design stress calculation. e) Bearing life and lubrication interval calculation. f) Insulation scheme. g) Diode selection calculation. h) Any other design related details. 1.15 QAP TO BE FOLLOWED DURING MANUFACTURING FOR DA SET:

Manufacturer shall comply to Quality Assurance Plan as per ANNEXURE—G

1.15.1 Since the quality of the equipment bears a direct relationship to the manufacturing

process and the environment under which it is manufactured, the manufacturer shall

ensure Quality Assurance Program of adequate standard.


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1.15.2 The material purchased from outside agencies shall conform to the relevant Standard

Specification as specified in RDSO / IS Specification. The certificate conforming to

RDSO / IS Specification should also be made available for each lot of machines . It is also

preferred that in-house test facilities for purchased items should be developed by the

firm so that testing of these materials can be done within the factory premises so that

check can be exercised by the Inspecting Authority in case necessary, otherwise, the

testing of these materials should be done by NABL accredited Testing Agency.

1.15.3 Firm shall submit all the technical documents i.e drawings, design calculation, layouts,

circuit diagrams etc in soft copy as well.


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CHAPTER 2

TECHNICAL REQUIREMENT OF DIESEL ENGINE

2.0 DIESEL ENGINE:

The Diesel engine shall be of robust and reliable design, turbo charged and water-cooled.

Engine shall be able to deliver power for getting minimum electrical power output from

alternator of 336 KW at site condition of 55 º C and 200 m altitude at 1500 RPM. Firm shall

declare the BHP rating of engine at standard reference condition as per BS 5514 part-1 i.e

at total barometric pressure=100 kPa, Air temperature=25 º C Relative humidity 30 % and

charge air coolant temperature 25 º C. Accordingly, deration curve if any shall also be

submitted. Manufacturers shall ensure that engine supplied to Indian Railways must be

complying to latest applicable CPCB norm for emission on the date of supply. Engine shall

be capable to work on 110 % overload for one hour in 12 hour period of operation.

2.1. ENGINE COOLING SYSTEM:

2.1.1 The engine shall be water cooled and shall be supplied with Radiator. The radiator shall be

suitable for separate mounting at a remote location to facilitate cooling by a fan to be

driven by suitable capacity, 3- phase, 415 volts, and squirrel cage induction motor. The

engine shall also be supplied with suitable circulating water pump, lubricating oil heat

exchanger, lubrication oil pump, interconnecting pipes, silencers, and exhaust pipes.

2.1.2 The drawing for the location of the radiator with respect to the face of the engine and its

mounting and the ventilation arrangements shall be submitted by firm for prior approval of

RDSO / RCF.

2.1.3 The cooling equipment (Radiator, water pump, pipe lines etc.) shall be of adequate capacity

such that the water temperature is maintained within the specified range with the engine

operating at the full rated load at site conditions with radiator clogged to 30 %.

2.1.4 The air duct design with guided flow to avoid back turbulence shall be designed by the firm

and shall be got approved by RDSO / RCF in order to reduce the noise level (Supply of

duct shall be in scope of tenderer as per firm’s drawings).

2.1.5 The operating range of water temperature, under full load shall not exceed 95 º C

maximum.

2.1.6 Water level indication shall be provided on the radiator top tank at a visible location. If

water level falls below permissible limit engine should trip with low water level alarm in

crew compartment.


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2.1.7 The Firms shall furnish detailed drawings of the radiator indicating the overall and

mounting dimensions and other details to facilitate installation of the Radiator

separately. Technical particulars about the radiator, like minimum Air flow required

through the radiator at 55 ° C ambient, its total heat rejection capacity, the pressure drop

across the radiator etc. shall also be furnished.

2.2 AIR FILTER:

2.2.1 The engine shall be equipped with air filter of adequate capacity suitable for operation in

service conditions given in clause no. 1.4.

2.2.2 Drawing for fresh air inlet to air cleaner and turbo charger shall be submitted by firm for

prior approval of RDSO / RCF.

2.2.3 The air filter location shall be selected in such a way that crew cabin staff shall be able to

check the filter condition for clogging and its attendance. To facilitate this, suitable

restriction indicator will be provided. Additional engine tripping mechanism shall also be

incorporated in the engine control circuit which will trip the engine in case filter gets choked

beyond permissible limit.

2.3 FUEL PIPE LINE:

2.3.1 The scope of supply includes the supply and erection of seamless stainless steel heavy duty

pipes grade SS 316 and flexible hoses (SAE 100 R1 or better) of appropriate size and length

with necessary pipe and end fittings, isolating cocks, union sockets etc. as needed. The

exact quantity shall be as required at site. Rubber hose shall not be used in fuel circuit. No

banjo type fitting to be used as it is leakage prone.

2.4 FUEL / LUBE OIL:

2.4.1 The engine shall normally be required to operate on diesel fuel whose properties standard

shall be as per IS 1460-2000 or latest. The diesel engine shall be tested with Bharat

Stage II fuel oil in type test. Even though diesel engine being Bharat stage III compliant, it

shall be capable of operating with Bharat Stage-II CPCB conforming fuel oil in case of

emergency.

2.4.2 Drawing for Fuel oil suction and return from the engine pump to engine shall be submitted

by firm for prior approval of RDSO / RCF.

2.4.3 Required amount of lube oil and diesel oil for all the test during type testing and

commissioning tests shall be arranged by firm.


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2.4.4 Bye pass circuit filter to be designed in such a way that frequency of lube oil change is not

less than 500 hrs. Firms may use centrifugal lube oil filter in bypass circuit instead of Paper

filter.

2.4.5 Engine shall require only indigenous lube oil which is presently used by Indian Railways.

2.5 FUEL CONSUMPTION METER:

2.5.1 Fuel consumption meter shall be provided for monitoring the fuel oil consumption. Its

working shall be monitored during 6 months field trial.

2.6 RESIDENTIAL SILENCER:

2.6.1 The silencer shall be suitable for location on the coach roof exposed to atmosphere.

Adequate length of the pipes, elbows etc for carrying the exhaust hot gas in the silencer to

the atmosphere shall be supplied and erected by the firm. Provision shall also be made to

prevent water entry into the silencer. The portion of the exhaust pipe inside the coach and

from its manifold shall be suitably and adequately cladded. The design shall be such as to

suppress at least 25 dBA noise of exhaust. Test result for 25 dBA noise suppression shall

be submitted by the firm.

2.6.2 Drawing for general arrangement of silencer and exhaust system mounting

arrangement shall be submitted by firm for prior approval of RDSO / RCF.

2.6.3 The turbocharger exhaust manifold and the exhaust pipe lines shall be thermally insulated

and cladded with galvanized steel sheets or aluminum sheets and firmly secured so as to

ensure that there is no excessive heat in the engine room.

2.7 ELECTRONIC GOVERNOR: 2.7.1 The engine shall be supplied with Electronic governor conforming to International standard

like BS / IEC / ISO. The governor should be suitable for transport application. Electronic

governor should be directly mounted on the engine varying of the speed from idling speed

to maximum load speed and also in the Crew compartment.

2.7.4 There should be Electronic control panel & governor for Engine to improve regulation of

RPM and frequency, monitoring of engine parameters. The device shall be easily accessible

and preferably in crew area. The electronic control panel shall display the following

information:-

a) Lubrication oil pressure.

b) Water temperature.


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c) RPM of engine.

d) Battery voltage.

e) Faults are displayed directly.

It should have memory to store & access the last 50 faults data (minimum). Firm shall give

details of the system along with Overall General Arrangement (OGA) drawings & circuit

diagram.

2.8 STARTER MOTOR:

2.8.1 Diesel engine shall be equipped with a starter motor working from 24 V DC battery supply

and associated accessories like starter solenoid, fuel start Solenoid etc. for cranking the

engine. The motor shall be of adequate rating to crank the engine to firing speed under the

service conditions specified in Clause 1.4, without exceeding the temperature rise limits for

the class of insulation. The entire engine wiring shall be non-grounded. Starter motor shall

be of Delco Remmy, Lucas or reputed make with prior approval of RDSO / RCF.

2.8.2 It shall not be possible to energise the starter motor, when the engine is running at

speed above the minimum firing speed. Suitable cranking protection shall be provided.

2.9 STARTER BATTERY:

2.9.1 A 12 cell (3 mono blocks each comprising of 4 cells) 24 volts tubular lead acid battery of

290 AH capacity to IS: 7624 (latest) or RDSO’s specification shall be provided by the

supplier separate for each DA sets to feed power to the engine starter. The firm shall certify

the adequacy of the battery. The battery shall be suitable for high discharge starting

current and shall be taken from OEM directly.

2.10 SAFETY DEVICES, GAUGES / INSTRUMENTS:

2.10.1 The engine shall be provided with fuel solenoid and safety devices like high water

temperature cut-out, low lube oil pressure cut-out, air filter choke cut-out, low water level

cut-out, radiator air loss cut-out and over speed cutout etc. to facilitate automatic tripping

of engine. The gauges and meters as required shall also be supplied with minimum suitable

length of leads. Complete protection scheme shall be submitted to RDSO / RCF for approval

2.10.2 The performance monitoring panel (remote gauges panel) shall be mounted in side the crew cabin to facilitate monitoring/starting of Diesel engine from the cabin itself. The audio and visual alarm for the fault shall also be provided in the crew cabin itself so that fault can be understood and attended promptly by cabin crew staff. The inter connecting cables, if any shall be supplied by the firm. The control panels shall also have the


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lockable starting switch and push button for operating the engine and a ‘ STOP PUSH BUTTON ’. 2.10.3 During the emergency and other failures, stopping of the engine shall be by De - energizing

the fuel “Shut-Off valve” only or tripped through engine control Unit.

2.10.4 In emergency and other failure stopping of the engine shall be through Electronic governor actuator or through engine ECU.

2.10.5 The panel shall also have the starting switch for operating the engine and an

EMERGENCY ENGINE STOP push button for stopping the engine.

2.11 VENTILATION SYSTEMS:

2.11.1 The ventilation system shall be such that in actual service operating conditions, with the

diesel engine and alternator operating at their full rated capacity, the temperature of the

engine room shall not be more than 5 ° C, over the maximum ambient temperature. Engine

room ventilation shall consist of blower assembly complete with fan, motor and housing /

brackets suitable mounting.

2.11.2 Ventilation fan motor shall be IP - 65, Class-H insulation of M/S ABB, M/s Laxmi Hydraulic,

M/s Crompton, M/s Siemens, M/s Kirlosker Electric make only. The motor shall conform to

IS :325.

2.11.3 Ventilation aspects relating to Radiator cooling and Engine Room are given in Annex.-C 1 &

C 2.

2.12 TESTS ON DIESEL ENGINE:

2.12.1 Prototype, acceptance, and routine tests as mentioned in the table given below shall be

conducted on the diesel engine:-

2.12.2 TABLE FOR TESTS ON DIESEL ENGINE – A :

Sr.no Tests Type test

Accepta-nce test

Routine Test

Cl. Of Relevant Standards

1 Verification of dimensions of all

major assemblies and sub-

assemblies and weight of Diesel

Engine and Radiator

Yes Yes - As per this specification


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2 Rating test at simulated site

condition. During the test the

following recordings shall be

made

Clause no. 15.5.2 (Engine

group-3) of BS : 5514 pt-

1 1996 or latest

international standard.

Table -5 list -A test

measurements S.N. A 1 to

A 19 Tabte-7 list C and

Table -8, list D

CPCB certification

as per the latest guidelines

/ norms will have to be provided by the

manufacturer to substantiate the

compliance of emission

norms

a) Fuel consumption rate. Yes Yes Yes

b) Lube oil pressure. Yes Yes Yes

c) Lube oil consumption. Yes No -

d) Cooling water inlet and outlet

temperature.

Yes No No

e) Exhaust gas temperature. Yes Yes No

f) Smoke test. Yes Yes Yes

g) Torque Yes Yes Yes

h) Speed. Yes Yes Yes

3 Governing test Yes No No BS : 5514 Part-4 1997 and

ISO : 3046-4 or Latest

International Standard

4 Specific fuel consumption (SFC) test

Yes Yes Yes Clause no. 15.5.2 Table 6 list B of BS : 5514 part-I or

latest international standard.

6 Radiator capacity test (at

simulated or equated site conditions 55 º C)

Yes No No Annexure –C1 of this

specification for reference

only.

7

Special test:

Clause no. 15.5.2 (Engine

group-3) of BS 5514 Pt-I

1996 or latest

International Standard

Table-5 list A test

measurements S.No. A 1

i) Engine heat balance Yes No No

ii) Sound level Yes No No


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iii) Exhaust-gas emission

characteristics Yes No No to A 19

Table-7 list C and Table - 8

list D

8. Environmental test on Electronic

governor and electronic control panel.

Yes No No Clause 10.2.3, 10.2.4,

10.2.5, 10.2.6, 10.2.7,

10.2.8, 10.2.9, 10.2.10,

10.2.11 of IEC : 60571-

2006.

2.13 BILL OF MATERIAL

S.

No.

Description Qty/DG set

i) Diesel Engine as approved by RDSO for on board application in Engine room of

power cars along with following accessories:

1 Set

a Fly wheel with housing 1 No.

b Engine air cleaner mounted on Engine with the duct for collecting air from the

side wall opening of the coach.

1 No.

c Flexible coupling duly machined to match alternator shaft. 1 No.

d Lube oil cooler 1 No.

e Fuel filter and lube oil cleaner 1 No.

f Exhaust piping complete with metallic flexible pipe, rigid pipes elbows, flanges,

cladding of the exhaust pipes, and silencer with clamps (quantity as required at

site).

1 lot

g Fuel circuit piping including seamless stainless steel pipes, flexible hoses, pipe

fitting (brass). Non-return valves (as required at site).

1 lot

h Engine monitoring panel provided with the radiator water temperature gauge,

lube oil pressure gauge, Techno-hour meter, engine off push button, lube oil

temp. gauge, tripping of the engine due to failure of HWT, LOP,OS along with the

parallel remote annunciator for the same, tripping of engine due to air- filter

choking, tripping due to low water level ,tripping due to air loss from radiator

motor etc.

1 set


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i Set of gauges for remote mounting on the power and control circuit panel for

monitoring radiator water temperature, lube oil pressure, lube oil temperature,

fuel consumption meter etc.

1 set

j Safety devices (cut outs) for automatic tripping of engine in the event of high

water temperature, low Lube oil pressure and over speed mounted on the engine,

low water level, air-filter chocking, tripping due to air loss from radiator motor etc.

1 set

k Starting equipment 24 V dc consisting of adequate starter motor (not exceeding

10 KW), Starter solenoid & fuel start solenoid.

1 set

l Electronic governor with engine control and display panel. 1 no.

m Base frame for diesel alternator set complete, as per approved drawing with anti-

vibration mounting (clause 2.2). Firm shall keep the mounting arrangement of the

base rail common with the existing design i.e. keeping the mounting hole same to

avoid minimum changes.

1 set

n Coolant piping with fittings connected between radiator and engine. As per

requirement

ii Radiator assembly complete with radiator, water level indicator, blower fan, drive

motor frame work, fan housing, AVMs etc as per approved drawing.

iii 12 cell ( 3 mono blocks each comprising of 4 cells) tubular lead acid battery of

290 AH capacity to lS:7624(latest) or RDSO’s specification complete with inter-cell

connectors to feed power to the engine starter motor for cranking the engine

1 set

iv Engine room ventilation consisting of blower assembly complete with fan, motor

and housing / brackets suitable for mounting. Motor shall be of M/s ABB /

Siemens / Kirlosker electric / Laxmi Hydraulic/ CGL make.

1 set

v Dry type, fire retardant, removable and reusable panel type of approved make by

RCF.

As per

requirement

vi Anti vibration mounting pads of M/s Resistoflex or M/s Metalastik or any other

with prior approval


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CHAPTER-3

TECHNICAL REQUIREMENT OF ALTERNATOR

3.0 ALTERNATOR:

3.1.1 Alternator shall be rated at minimum 336 KW , 1500RPM, 750 V, 3 - Phase, 50 Hz , 0.8 pf

at site condition of 55 º C and 200m altitude. Firm shall also declare the rating of alternator

at standard reference condition as per IS : 4722 Accordingly, deration curve if any shall also

be submitted. Alternator shall have 10 % overload capacity for one hour in a span of 12

hours.

3.1.2 Alternator shall be of the self-excited, self regulated and self-ventilated brush less

design confirming to duty continuous class S 1 as per IS : 4722-2001 and shall have 3-

phase star connected winding with 4 terminals brought out for external connections.

The terminal shall be located in a terminal box, provided on alternator body.

3.1.3 The alternator shall be capable of catering to at least 30 % of unbalanced load in anyone or

two of the phases with the current in any of the phases not exceeding the rated current

with the regulation maintained at 5 % or less and 2.5 % or better in manual and AVR mode

of operation respectively.

3.1.4 Stator and rotor stampings shall be CRNGO steel sheet M-45 grade with C 6 coating.

Stamping shall be tested as per IS : 648 and IS : 649. Firm shall procure stamping from M/s

SAIL, M/s Nippons steel or any other make with prior approval of RDSO.

3.2 VOLTAGE REGULATION:

3.2.1 Voltage regulation of the alternator shall be of the dual control type i.e. both electric and

electronic. The electric control shall be through compound transformer or magnetic

amplifier open loop excitation and electronic regulation through solid- state automatic

closed loop excitation voltage control both sensing from all the three phases. The combined

regulation shall be within 2.5 % or better. There shall be “Stand-by” facility to ensure

regulation within 5% even in the event of failure of the automatic electronic voltage

regulator and this “Stand-by” facility shall automatically cut in, with the help of an over-

voltage / under voltage sensing device which would also indicate through LED indication

regarding failure of AVRs.

3.2.2 AVR (automatic voltage regulator) shall be modular type suitable for remote mounting in

power and control panel in crew room. Interconnecting cables and coupling arrangement

between alternator and AVR shall also be in the scope of firm. Dimensions and layout


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drawing of AVR shall be got approved by RDSO / RCF. Firm shall submit wave-form of field

supply at no load and full load and also provide percentage (%) THD in field at various load

conditions.

3.2.3 The cables required for manual stand-by control device, leading from the alternator to the

Over Voltage / under voltage sensing device provided externally shall be in the scope of

firm. Cables shall be e-beam of RDSO approved make.

3.2.4 The input leads to the AVRs shall have fuse protection with appropriately rated fuse of

Siemens / L & T make. The AVRs shall be of the plug-in type. AVR and over voltage sensing

device shall meet the environmental condition as per IEC : 60571-1998 in respect of dry

Heat, Damp Heat, Voltage Surge, insulation resistance test & vibration etc.

3.2.5 The rotating diodes used for supplying DC power to the main field winding shall be of

current rating equal to at least 2 times the loading on them under full load of the

alternator. They shall be of minimum 1000 V PIV rating. Under the full load operating

conditions the case temperature of the diodes shall be at least 20 ° C below the limit

recommended by the manufacturer. Provision of appropriately rated fuses / MOV on the

input side of the rectifier bridge is desirable.

3 2.7 Firm shall submit details of harmonics content at various load condition to RDSO for

approval. This is very essential to limiting neutral current at design stage. There shall be no

need of any neutral current limiting reactor.

3.2 8 In layouts, where the rotating diodes are located at the hot air exit end, the current rating

of diodes shall be at least 3 times the loading.

3.2.9 Calculation for adequacy of the diodes selected with there characteristics shall be

submitted for approval to RDSO / RCF.

3.3 TERMINAL BOX:

3.3.1 The terminal box shall be located at the non-drive end. Suitable cut-away with a cover plate

having cable entry holes (suitable for 150 sq.mm e-beam cables) for output power. Cables

shall be provided as per RDSO specification no. ELRS / SPEC. / ELC / 0019 (REV.’2’), Feb.,

2011 or latest.

3.3 2 The internal and external cable terminations shall be on fiber glass DMC / SMC terminal

board located across each other without crisscrossing and suitable for crimped terminations

connected palm to palm. The spacing between terminals shall be minimum 75 mm between

phases and phase to neutral. The head of the terminal studs (preferably hexagonal) shall


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be embedded on the rear of the terminal board and be further secured on top by a nut. For

securing cable lugs, nuts, lock nuts, flat and spring washers shall be provided.

3.3.3 The air clearance between un-insulated live parts and body of alternator shall not be

less than 75 mm.

3.3.4 FIRE RETARDANT TEST: Fire retardant test for terminal board shall be done as per

Annexure —F

3.4 ALTERNATOR VENTILITION:

In order to prevent dust ingress, the cooling air will be drawn from the inside of the engine

room or through the side walls through dry type air filters and ducts. The firm shall submit

the drawings for general arrangement of ducting for approval by RDSO / RCF.

3.5 INSULATION & WINDINGS:

3.5.1 The alternator shall have stator insulation of class ‘H’, rotor insulation of class ‘H’ and

exciter insulation of class’ H’ . Slot liners and slot wedges used in stator, exciter rotor and

exciter field shall be of class ‘H’ and minimum 4 kV (mm) breakdown voltage. Coil

insulation, head insulation, aeration wedge etc. used in main rotor shall be of class ‘H’ and

minimum 4 kV (mm) breakdown voltage. All sleeves shall be of class ‘H’ insulation. All

winding wires used in main stator, exciter and main rotor shall be insulated with class ‘H’

insulation by vacuum pressure impregnation process.

3.5.2 The manufacturer shall submit the insulation scheme of the alternator with details of

thermal and electrical insulation properties of the material used with relevant standard

specification.

3.5.3 WINDING WIRE:

3.5.3.1 The main field winding which shall he on the rotor shall be strip conductor having

enameled glass covered insulation conforming to IS : 13730 Pt- 13- 1993 or better with

class 200 of insulation “H”.

3.5.3.2 VACUUM PRESSURE IMPREGNATION PROCESS (VPI): All the windings used in the

alternator shall be impregnated through Vacuum Pressure impregnation process (VPI).

The winding shall be subjected to pressure impregnation as per recommended procedure

of varnish manufacturer. Varnish used shall be FT 2005 of M/s Dr. Beck.

3.5.3.3 The test on enameled winding wires shall be conducted as per IS : 13778 Pt. 1 to 6. The

manufacturers shall maintain separate documentation for these tests, indicating the


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winding wire supply particulars. Winding wire shall be from RDSO / CLW approved

sources.

3.6 HARMONIC DISTORTION:

3.6.1 Alternator shall be designed so that the total harmonic distortion is below 5 % of the rated

capacity.

3.6.2 Firm shall arrange to test the quality of power supply in actual service condition with

rake for voltage, frequency and harmonic contents.

3.7 BEARING:

The type, size and make of bearings used in the alternator shall have the prior approval of

RDSO

a) The alternator shall be fitted with of SKF / FAG bearing.

b) Firm shall submit the calculation of L 10 bearing life at 1500 rev. / mm.

3.8 SHAFT DESIGN:

Special care shall be taken in regard to design and manufacture of rotor shafts. The

detailed manufacturing drawing of the shaft shall be got approved by RDSO. The supplier

shall ensure that the raw material for the shaft is EN 24 hardened and tempered. At change

of sections, smooth ground finish should be obtained after giving maximum possible radius

with form tool. Finished shafts shall be subjected to ultrasonic to detect internal flaw. The

ultrasonic testing shall be conducted on each rotor shaft and certificate of the same shall be

attached with each lot at the time of inspection.

3.9 ROTOR:

The Rotor of alternator shall be dynamically balanced to balancing quality grade of G 2.5 to

IS / ISO 1940 -1 : 2003. The dynamic balancing of rotor shall be checked individually on a

balancing machine.

3.10 TESTS FOR ALTERNATOR:

3.10.1 Test Instruments: The indicating instruments used in electrical measurement shall conform

to relevant Part of IS : 1248 of 1984 or latest. Instruments with the following accuracy shall

be used:

a. For type, acceptance and routine tests instrument of class 0.5 accuracy.


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b. For surge protection test, the amplitude and duration of the surge voltage shall be

measured by oscilloscope and stop watch.

c. Stator resistance shall be measured by a micro ohmmeter or Ammeter Voltmeter

method.

3.10.2 Type, acceptance and routine tests as mentioned in the table given below shall be carried

out on the alternator in accordance with IS : 4722-1868, in conjunction with lS : 7132-

1973, lS : 7306-74 and IEC-115 to check for adequacy of the design to meet the

stipulations in respect of designs, workmanship and materials.

3.10.3 TABLE FOR TESTS FOR ALTERNATOR-B

Sno Tests Type

test

Acceptance

test

Routine

test

Clause of relevant IS / IEC

1. Verification of dimensions of alternator assembly

Yes Yes Yes As per approved drawing

2. Measurement of resistance

Yes Yes Yes Clause 8 of IS : 7132-73

3. Phase sequence test


4. Regulation test Yes Yes Yes Clause 7 of IS : 7306-74

5. Measurement of leakage reactance & potier reactance.

Yes Yes No Clause 5.2 & 5.3 of IS :

7306-74

6. Measurement of OCC (open circuit characteristics)

Yes No No Clause 21 of IS : 7132-73

7. Measurement of short circuit Characteristics

Yes No No Clause 21 of IS : 7132-73

8. Efficiency test Yes Yes No Clause 6.2 of IS : 4889-68

9. Temperature rise test for windings.

Yes No No Clause 25 of IS: 7132-73 &

Cl.11 of IS : 4722-2001 or

latest.

10. Temperature rise test on rotating

Yes No No 10.2.4, 10.2.5 of IEC-60571-


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Diodes 2006

11. Overload test Yes Yes No Clause 16 of IS : 7132-73 &

Cl. 12 of IS : 4722-68 the

diesel alternator is also

capable to work on 110 %

overload for one hour under

service conditions prescribed

above.

12. Over speed test. Yes Yes No Clause 13 of IS : 7132-73 &

Clause 24 of IS : 4722-2001

or latest

13. Insulation resistance test


or latest

14. High voltage test Yes Yes Yes Clause 9 of IS : 7132-73 &

Cl. 21 of IS : 4722-68

15. Determination of wave form deviation factor

Yes No No Clause 12.1 of IS : 7132-73

16. Determination of wave form distortion factor


17. Determination of harmonic factor


18. Test for manual by pass with automatic change over arrangement.

Yes Yes No As per Clause 3.2 of this

specification

19. Test on AVR for environment

Yes No No Clause 10.2.3, 10.2.4, 10.2.5,

10.2.6, 10.2.7, 10.2.8,

10.2.9, 10.2.10, 10.2.11 of

IEC : 60571-2006.

20. Test on over-voltage sensing device for environment

Yes No No Clause 10.2.3, 10.2.4, 10.2.5,

10.2.6, 10.2.7, 10.2.8,

10.2.9, 10.2.10, 10.2.11 of

IEC : 60571-2006.


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21. Endurance test on over voltage sensing device 500 operation at 30 sec. ON & 30 Sec. OFF.

Yes No No

22. Test for verification of the total harmonic distortion.

Yes Yes No As per Clause 3.6 of this

specification

23. Checking dynamic balancing of rotor.

Yes No Yes As per Clause 3.9

3.10.4 MEASUREMENT OF STATOR AND FIELD RESISTANCE OF ALTERNATORS:

It shall be measured by suitable resistance measuring device when the alternator is at

ambient temperature. Ambient temperature at the time of carrying out the test shall also be

recorded. The stator and field resistance at 20 ° C shall be averaged for first 5 machines.

The resistance of any stator or any field winding shall not vary by more than +7 % from

the declared value.

3.10.5 TEMPERATURE RISE TEST:

The alternator in conjunction with the Automatic voltage regulator (AVR) shall run at rated

current & voltage at 1500 rev/min speed till the temperature stabilizes. Temperature of the

stator winding, field windings, bearings, terminals and frame shall be measured. The

temperature rise above the ambient of 55 ° C shall not exceed the following values under

full load condition as well one hour over load conditions: -

Class of insulation Temp. rise limit Method of measurement

H 115 ˚ C Resistance /Ohm meter or better

The temperature rise of terminals, frames etc. shall be as low as possible. The maximum

bearing temperature at the highest ambient temperature of 55 °C shall not exceed 100 ° C.

The temperature measurements on all location shall be made by point contact pyrometers

unless otherwise specified or agreed to.

3.10.5.2 The temperature rise of main diodes shall be less than designed temperature limits of

each component under worst operating conditions.


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3.10.6 INSULATION RESISTANCE TEST:

3.10.7.1 The insulation resistance shall be carried out on all the circuits, before and after high

voltage test between all live terminals shorted together and body with a megger. The

meggering voltage and values of the insulation for the various circuits shall be as under:

Sno Rated circuit voltage Meggering voltage Insulation resistance value

1. 750V AC 1000 V DC Not less than 100 mega Ohms






3.10.7 HIGH VOLTAGE TEST:

Immediately after the temperature rise test, an AC potential of 1500 V rms at 50 Hz shall be

applied between all external terminals of the alternator shorted together and the frame for

a period for 1 minute. The test shall commence at a voltage of less than one third the test

voltages and shall be increased gradually to the full test voltage. The leakage current shall

not exceed 30mA for the above tests.

3.10.8 MECHANICAL OVER SPEED TEST:

3.10.8.1 The test is to be conducted as soon as possible after the temperature rise, test, while the

alternator is still hot. The alternator shall be subjected to 20 % over speed (1800 rpm=

60 Hz. for 4 pole construction) for a period of 2 minutes.

3.10.9 SHORT CIRCUIT CHARACTERISTIC TESTS:

The output terminals of the alternator shall be short circuited with an ammeter in circuit

before starting this test and excitation shall be adjusted in such a way that 50 %, 75 %

and 100% of full load current flows through the armature windings. The test shall be

carried out at various speeds covering complete speed range. The speeds selected for this

test shall be same as selected for open circuit test. Curves shall be plotted at different

speeds for field current versus short circuit current. This test shall be carried out on a cold

machine.


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3.10.10 OVER VOLTAGE PROTECTION:

In case of failure of AVR, relay of the over voltage sensing device should be actuated

and manual by pass of the system to be checked.

3.10.11 EFFICIENCY TEST:

3.10.11.1 The efficiency test shall be conducted on 50%, 75 % 100% 110% load. The efficiency

at 1500 rev/min shall not be less than 92 % at full load.

3.11 THE BILL OF MATERALS OF ALTERNATOR SHALL BE AS PER THE DETAILS

GIVEN BELOW:

S.

No.

Description Quantity/DG

set

1 Self excited, self regulated self ventilated brushless 336 KW

alternator at site condition of 55 deg C and 200 m altitude.

1 set

2 Crimping sockets for copper cable of sizes 150sqmm, 120

sq. mm., 16 sq. mm. to specn. EDTS 200 and Crimping

sockets for copper cable of sizes 6 sq mm and 1.5 sq mm to

specification no EDIS 201.

1 set

3 e-beam cables of various sizes as required of RDSO

approved make and as per RDSO specification

1 set

4 Set of special tools required for maintenance (list to be

submitted during tendering stage

1 set

5 Computer generated cable marker of reputed make As per

requirement

6 AVR (automatic voltage regulator) modular type

interconnecting cables and coupling arrangement between

alternator and AVR

1 set

7 Plug- in type fuse protection with appropriately rated fuse of

M/s Siemens, M/s L&T , M/s Ferraz make for AVRs

As per

requirement

8 The rotating diodes for supplying DC power to the main field

winding of current rating equal to at least 2 times the

As per

requirement


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loading on them with minimum 1000V PIV rating

9 M/s SKF / FAG / NSK make of bearings approved by RDSO

used in the alternator

As per

requirement

10 Fiber glass DMC / SMC terminal board with box cover

approved by RDSO

As per

requirement

11 Flexible coupling for engine and alternator. 1 set

12 Relays/contactors of M/s ABB/Siemens/ Schenider/L&T

make

As per

requirement

3.12 ENCLOSURES:

S. No. Annexure No. Description

1. Annexure-A Technical data sheet for diesel engine 2. Annexure-B Technical data sheet for alternator 3. Annexure-C1 Technical details for radiator system 4. Annexure-C2 Technical details of ventilation arrangement

for engine room 5. Annexure-D List of drawings and specifications 6. Annexure-E Cartel formation certificate 7. Annexure-F Fire retardant test 8 Annexure-G Format for Quality Assurance Plan


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ANNEXURE –‘A’

SCHEDULE OF TECHNICAL DATA SHEET OF DIESEL ENGINE (PARTICULARS TO BE SUPDLIED BY

THE MANUFACTURER AT THE TIME OF REGISTRATION /PROTOTYPE TEST.)

1.0 Following particulars pertaining to diesel engine and auxiliary equipment shall be submitted by

the tenderer to RDSO/RCF:

1.1 Diesel Engine

A-1 General Data

A-1.0 The particulars for diesel engine.

a) Make & Model & No.

b) Weight and dimension of diesel engine with accessories.

A-1 .1 Fuel consumption of the engine at

a) 100 %, 110 %, 75 %, 50 % in Kg/hr.

A-1.2 Lube oil consumption of the engine at

a) 100 %, 110 %, 75 %, 50 % in Kg/hr.

A-1.3 DESIGN DETAIL:

1. Rated output of the engine at NTP and site condition.

2. Rated engine speed.

3. Number and arrangement of cylinders.

4. Cylinders bore.

5. Piston stroke

6. Compression Ratio

7. Mean Piston Speed

8. BMEP (Break Mean Effective Pressure) at rated output

9. Normal no load idling speed


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10. Peak firing pressure

11. Full test result and data pertaining to engine tests.

12 Specific fuel consumption at half, full and 10% overload conditions with tolerance band

under NTP and site conditions. Indicate the lower calorific value of the fuel used in arriving

at the specific fuel consumption figure.

13. Fuel oil consumption at idle speeds (normal & low)

14. Lube oil consumption at rated output as percentage of fuel oil consumption.

15. De-rating calculation for site condition

16. Safety devices provided:

i) Over speed ii) Low lube oil pressure iii) High cooling water temperature iv) High lube oil temp. v) Any other

17. Weight of engine excluding oil and water. 18. Volume and weight of water contained in the engine. 19. Volume and weight of oil contained in the engine 20. Weight of major equipment:

i) Turbocharger ii) After-Cooer iii) Cylinder block iv) Piston and connecting rod v) Cylinder liner vi) Cylinder head

21. Temperature of exhaust gas at tube inlet at rated output under NTP and site conditions. 22. Method of starting giving details of equipment. 23. Periodicity of overhauling the following critical items:

i) Turbocharger ii) Piston and piston rings


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iii) Air and exhaust valve iv) Main bearings v) Connecting rod bearings vi) Fuel injection pump vii) Fuel injectors

24. General arrangement and dimensional details. 25. Characteristic curves for torque, output and specific fuel consumption for different loads. 26. The curve of fuel consumption against load. 27. Power consumption of various auxiliary devices under full load condition 1500 rpm.

28. Radiator capacity in terms of air flow rate and air velocity through radiator.

29. Heat balance diagram of diesel engine.

30. Heat dissipation characteristic of radiator under operating conditions power consumption of

radiator fans motors.

A-2 Fuel Injection System:

1. Type of fuel injection system

A-3 Turbocharger:

1. Number of turbocharger used for engine. 2. Make and model. 3. Air flow at rated output 4. Speed of turbocharger at rated output. 5. Types of bearings. 6. Details of lubrication. 7. Whether pre and post lubrication provided. 8. Booster pressure at full load.

A-4 Air Cooler:

1. Type of cooler. 2. Details of mounting indicating whether cooler can be removed without removing turbocharger.


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A-5 Exhaust System:

1. Type of exhaust system 2. Number of exhaust gas entry segments. 3. Whether the exhaust manifold is shrouded/insulated.

A-6 Piston and Rings;

1. Material specification of piston and rings. 2. Method of cooling 3. Shape of bowl in piston crown 4. Number and configuration of piston rings.

A-7 Valves:

1. Material specification of valve 2. Single/composite type. 3. Whether valve rotators used. 4. Recommended tappet clearance 5. Angle of valve and seat

A-8 Cylinder Head:

1. Material 2. Coolant flow distribution 3. Weather reclaimable by welding

A-9 Cylinder Block:

1. Material 2. Whether cast for fabricated 3. Is the mounting rigid or on resilient pads 4. Experience regarding block distortion

A-10 Crankshaft:

1 Material specification 2. Type of bearings calculate bearing loads 3. Particulars of vibration damper


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A-11 Cylinder Liner:

1. Material 2. Dry of wet liners 3. Water sealing arrangement between liner and cylinder block

A-12 Connecting Rod and Bearings:

1. Material of connecting rod 2. Material composition of bearing shells.

A-13 Electronic Governor and control panel:

1. Make and type 2. Minimum idle speed. Rated full load speed and droop characteristics. 3. Torque available on the output shaft 4. Control/safety feature provided.

A-14 Cooling Water System:

1. Detail of cooling circuit 2. Type of water pump and its characteristic viz delivery vs flow resistance. 3. Is the cooling system pressurized? If so, up to what pressure? 4. Max permitted cooling water temperature at inlet & outlet of circuit 5. Normal cooling water temperature at full load under NTP and site conditions. 6. Radiator construction and dimensional details.

A-15 Lube Oil System:

1. Details of oil circuit with flow diagram 2. Lube oil pressure at full & idle speed 3. Max temperature at hottest point 4. Lube oil pump characteristic and power absorption at various points. 5. Details of all filters used in the lube oil circuit. 6. Efficiency of filtration and periodicity of attention.

A-16 Fuel System:

1. Schematic fuel oil circuit. 2. Details of fuel oil lift pump and its drive 3. Details of filters used in fuel oil circuit. 4. Periodicity of attention.


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A-17 Intake Air System:

1. Details of engine intake air system. 2. Type of primary and secondary stage filters and their efficiency. 3. Pressure drop permitted at the operating point for periodicity of attention.

A-18 Other items: A-18.1 Make Type & capacity of cooling equipment. A- 18.2 Power consumption of radiator fan at nominal speed. A-18.3 Normal and maximum permissible lubricating oil temperatures A-18.4 Normal and maximum cooling water temperature. A-18.5 Make, type & HP of engine starter motor. A-l8.6 Overall dimension and Weight of Diesel engine A-18.7 Overall dimensions with mountings of diesel engine as per ROSO specification. A-18.8 Exhaust gas temperature at turbo inlet A-I 8.9 Capacity of lube oil sump. A-18.10 Design calculation for the base frame together with selection of AVMs to limit the

vibrations as stipulated in clause-4 .2. A-18.11 The water pump capacity of radiator cooling. A-18.12 Total heat rejection capacity of radiator minimum air flow required end pressure drop

across the radiator. A-18.13 Noise level in db(A) at 1m and 2m distance when DA set is working on full load at 0.8 p.f. A-18.14 Heat load calculation for complete scheme with selection of radiator fan, ventilation fan,

radiator motor fan capacity and ventilation fan motor capacity.

4-18.15 Class, type and make of electronic governor and electronic control panel.

A-18.16 Interval between the successive overhauling.

A-18.17 Whether the engine supplied has been type tested by ROSO.


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ANNEXURE-B

SCHEDULE OF TECHNICAL DATA SHEET FOR ALTERNATOR

(PARTLCULARS TO BE SUPPLIED BY WE MANUFACTURER AT THE TIME OF

REGISTRATION / PROTOTYPE TEST.)

B-1.0 Alternator:

B-1.1 Make & Model.

B-1.2 Rating (continuous) at NTP

a) Output ………..KVA

b) Current ……….. Amps.

c) voltage / phase ……….. Voltage

d) Frequency …….Hz.

e) Power factor at full load.

f) De-rating factor at on site condition

o) Speed of Alternator in ………… RPM

B-1.3 Number of poles.

B-1.4 Class of insulation. (Specified H class)

a) Stator winding

b) Rotor winding

B-1.5 Excitation system

a) Type of excitation.

b) Excitation system voltage

c) Excitation current.


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B-1.6 Efficiency

a) Full load …………%

b) Three/fourth(3/4) …………%

c) Half load(1 /2 ) ………..%

d) 110% of full load ……..%

B-1.7 Weight of alternator with exciter DA set

B-1.8 Over all dimensions with drawing (alternator).

B-1.9 Overall dimension of complete se. with drawing.

B-2.0 Over voltage sensing device-make.

B-2.1 Diesel engine control panel with details of instruments and interlocks.

B-2.2 Setting of trip at - Volts

B-2.3 Rating of contacts - Amps.

B-2.4 Rating of contacts - Volts.

B-2.5 Circuit diagrams.

B-3.0 The details of the regulating system and schematic diagrams.

Make,

Dimensions ( length x width x height) in mm.

Weight in . ---kg.,

Voltage adjustment range ---

Current adjustment range ---

B-4.0 Calculations for the adequacy of the diode selected with their characteristics.

B-5.0 Calculation & test results of harmonic content of power supply in actual rake load condition.

B-6.0 Alternator Shell particulars


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(a) Material of the shell

(b) Length of the shell

(c) Outer dia of the shell

(d) Inner dia of the shell

(e) Drg. of the Shell with all tolerances and manufacturing process

B-7.0 Alternator Stator particulars

(a) Inner dia of stamping

(b) Outer dia of stamping

(c) Thickness of stamping

(d) No. of stampings used

(e) Wt. Of stator core

(f) Grade of magnetic material used

(g) Supplier’s name

(h) Power loss per kg

(i) Material specification

(j) Details of locking arrangement of stator core of both side.

{k) Pressure used to install the lamination in position

(I) Checking methods adopted to ensure true-bore of stator

(m) Total length of stator lamination.

B-8.0 Alternator Rotor particulars:

(a) Total length of rotor shaft

(b) Material of rotor shaft

(c) Inner dia of stamping


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(d) Outer dia of stamping

(e) Total length of stamping

(f) Thickness of stamping

(g) No. of stampings used

(h) Wt. Of rotor core

(i) Grade of Magnetic material used

(j) Supplier’s name

(k) Power loss per kg

(I) Material specification

(m) Details of locking arrangement of rotor stamping on both side

(n) Pressure used to install the lamination in position

(o) Checking methods adopted to ensure outer dia of rotor

(p) Finished shaft drawing clearly indicating bearing seat, dimension on shaft and dimension of bearing with tolerances. (q) Both ends end-shield manufacturing drawing

(r) Rotor skew angle

B-9.0 Windings of alternators:

(a) Size of copper wire (Stator with specification and maker)

(b) Size of copper wire (Field with specification & maker)

(c) No. of turns per coil (stator)

(d) No. of turns per coil (field)

(e) Type of varnish used for impregnation

(f) Method of impregnation used

(g) Type of slot insulation used


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(h) Type of wedge insulation used

(i) Type of insulation used on overhang

(j) Details of lead wire

(k) Method of lead and winding wire joint.

(I) Type of winding used.

B-10 Shaft details

(a) Material of shaft

(b) Dimension of shaft

(c) Die of shaft

B-11 Bearing

(a) Make and type of bearing

(b) Drive end & Non- drive end bearing

B-12 Recommended grease (specify IOC brand)

(a) Frequency of greasing including quantity.

(b) Method of greasing

B-13 Data shoot for selection of power diodes

(a) Type of diodes

(h) AV Current

(c) Av. Voltage

(d) Permissible junction temperature

(a) Av. Forward voltage drop

(f) Weight of diodes

(g) Any other parameters


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ANNEXURE C- 1

SCHEDULE OF TECHNICAL DATA SHEET FOR RADIATOR SYSTEM

(PARTICULARS TO BE SUPPLIED BY THE MANUFACTURER AT THE TIME OF


C-1.0 Radiator System:

C-1.1 The radiator and its cooling system layout should be designed in such a way that it should

transmit minimum noise on the Railway plate form.

C-1.2 The power required for radiator cooling should be as low as possible and in no case should

be more than 30 kW.

C-1.3 The fan shall have an air handling capacity (in cu. meter /hour) of at least 20% more than

the minimum requirements of the radiator to maintain the engine cooling water

temperature at the specified level under continuous full rated load of the engine at site

conditions. The fan shall deliver the air volume at a minimum static head of 50 mm W.G

C-1.4 Suitable louvers/sound attenuator are to be provided in front of the radiator to facilitate air

flow and prevent Sound leakage.

C-1.5 Suitable louvers /sound attenuator are to be provided in front of the radiator to facilitate air

flow and prevent Sound leakage.

C-1.6 Tests:

C-1.6.1 Blower motor shall be subjected to type and acceptance tests in accordance to relevant IS

specification.

C-1 6.2 Radiator capacity test (at simulated or equated site conditions at 55˚ C )

Testing procedure is given below:

i) Under this test diesel engine is connected to the radiator designed for use in the high

capacity power car and operated at 100% and 110% load. This test is conducted with the

radiator in the free and 30% choked condition. For the later the surface area of the radiator

is blocked in a distributed manner for 30% of the area. During this test the inlet and outlet

temperature and the flow of water and air are measured.


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ii) The water temperature, the heat transferred through water and air are computed and

compared with the declared heat balance characteristics.

iii) If the radiator inlet air is preheated to 55 ° C (for simulation) then the test is conducted in

the prevailing ambient temperature and the water temperature at the equated site

conditions is determined. The radiator inlet water temperature recorded shall be well below

the maximum permissible temperature by the value equal to the difference between 55˚ C

and the test ambient temperature.

iv) For the purpose of the test, thermostat regulating the water flow through the radiator shall

be kept open

C-1.6.3 Capacity of the blower for radiator cooling shall be specified.

C-1 .6.4 The firm shall create a mockup at their works to simulate the service conditions.


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ANNEXURE C- 2

SCHEDULE OF TECHNICAL DATA SHEET FOR VENTILATION SYSTEM

(PARTICULARS TO BE SUPPLIED BY THE MANUFACTURER AT THE TIME OF


C-2.1 For the purpose of engine room cooling/ventilation, two numbers of centrifugal type

fans with dual radial outlets are to be mounted on each DA set, at the cant rail level in

roof. The cooing air shall be drawn through the two louvered openings of size 600 x

1600 mm with filter panels and through the engine room bottom circular inlet of the

blowers, exhausted through the louvered openings of size 475 x 300 mm, provided on

the curved portion of the roof. The rating of the motor shall not exceed 5.0 KW.

C-2.2 Blower shall be of ABB/ Siemens/Kirlosker make with terminal connections suitable for

Star-Delta starter.

C-2.3 he selection of blower shall be such that its capacity is at least 10% more than the

requirements to meet the Engine room temperature conditions specified. In deciding

the static pressure to which the blower rating is to be designed the same conditions

given in clause 2.0 shall be taken into account.

C-2.2.4 The impellers of the blower should be fully welded. Stiffening arrangement has to be

provided for the impellers to eliminate the distortion due to service conditions.

C-2.2.5 The blower design and motor shall be in accordance with clause 1.3 of Annexure-C 1

and tests shall be performed on blower as per para 1.6 of Annexure-C 1.

C-2.2. Panel Filters:

C-2.2.1 The panel filters used shall be of the panel mounted type. The filter media shall consist

of three layers of graded density fire retardant glass fiber pads and a layer of woven

fiber-glass cloth at the outlet side, all sandwiched together and stitched securely. The

filter media shall be given a spray of dust trapping oil (servo friz-68 or equivalent) on

the inlet face. The filter media pleats shall be properly sealed and secured with the

frame to prevent air leakage and media migration. These filters shall give a service life

of maximum six months before choking. All metallic parts shall be properly painted. The

design of the filter shall be got approved in advance from RDSO. The filters shall be of

RDSO approved make.

C-2.2.2 The pressure drop across the filter shall not be more than 5 mm of WG when new and

18 mm of WG when in fully clogged condition.


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C-2.2.3 The filter shall be capable of filtering out dust particles of size greater than 20

microns.C-2.3.4 The material used for housing the filter element shall be either electro-

galvanized or shall be of non-corrosive material.

C-2.2.5 The type of filter to suit the dimensions for two nos. of panels provided in coach shall

be clearly furnish by the firm.

C-2.3 Tests for filter:

At least one filter panel shall be subjected to type tests in accordance with the relevant IS specification and the remaining will be checked for dimensions and physical damages.

C-2.3.1 The capacity of blower for engine room cooling, calculations to establish their adequacy,

rating of the motor, filter details, overall dimensions, weights etc, shall be furnished along with the tender.


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ANNEXURE -D

LIST OF DRAWINGS

A) GENERAL ARRANGEMENT OF DIESEL ENGINE

B) RADIATOR MOUNTING DRAWING

C) VENTILATION MOTOR MOUNTING

D) RAIL BAFE FRAME DRAWING


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ANNEXURE -E

UNDERTAKING AGAINST CARTEL FORMATION

We……………………………….. hereby, give an undertaking that as a Registered Vendor

for manufacture and supply of………………………………….. will not be a part of a cartel with other

vendors and will be quoting competitive rates in the tenders invited by the Indian Raiiways/Pus

We ……………………………………………..are aware of the fact that the Registering Authority i.e. RDSO

may de-list the name of our firm from the Master List of Approved Vendors if complaint is received

about such cartel formation from any of the Railways/Production DA sets.

.

Seal and signature

(Authorized signatory of the firm)

Date:

Place:

Seal:


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ANNEXURE -F

FIRE RETARDANT TEST

1.0 A piece of terminal board of alternator measuring about 150 x 25 mm or nearest to this size

shall be subjected to the luminous batswing flame, preferably supplied by a Bunsen burner.

The specimen shall be held with the flat side up at an angle of 45° to the horizontal. The

flame shall be of 25 mm. in width across the tips.

2.0 The flame shall be applied to the specimen at the lower end for 30 seconds and removed

for 30 seconds and then applied again to the same end for second period of 30 seconds

and then removed again.

3.0 Should be specimen get ignited, it shall not continue to burn for more than 50 seconds after

the flame has been removed.


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ANNEXURE -G

FORMAT FOR QUALITY ASSURANCE PLAN

1 Organization:

The firm shall submit the organizational chart, along with the qualification and experience

of key persons in management involved in quality assurance program.

2 Documentation:

The manufacturer shall maintain all necessary documents and data that will help him have

consistency in producing quality product.

3 Purchase of raw material:

Raw material/equipments shall be procured only from well-proven sources, conforming to

relevant standards. Critical components shall be procured from reputed OEM or their

accredited agents.

4. Quality Control-Process:

Screening of critical electronic component/devices shall be carried out as a part of process

quality control method adopted should be clearly explained.

5 Inspection and Testing:

(i ) Receiving Material: The manufacturer shall ensure that incoming material is not used for

processing until it has been inspected and verified as confirming to specified

requirements. Verification shall be in accordance with quality plan or laid down

documented procedures.

(ii) In process inspection and testing: Inspect, test and identify product as required by the

quality plan or documented procedures evolved on the basis of RDSO specification and

other relevant specification/standard.

(iii) The supplier shall carryout all final tests and inspection in accordance with the quality

plan or documented procedures evolved on the basis of RDSO specification and specified

standard to complete the evidence of conformance of the finished product.

6. Testing / Measuring Instruments.

The instrument and equipment used for testing, and inspection shall be of the required

accuracy.


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7. R & D Organization:

The firm shall indicate the organizational structure of their R&D wing along with

qualification of the personnel. Firm should have at east one Engineering Graduate design

engineer with experience of more than 3 years in the field of Mechanical and Electrical

engineering

8. Laboratory Test House: The manufacturer shall have a well equipped Laboratory/Test

House to carry out various tests on the raw material, stage inspection and inspection of the

finished product.

9. Traceability of components used: Manufacturers shall elaborate the procedure being

followed for ensuring traceability of critical components used, and in house test performed

on each critical components, sub assembly & complete equipments individually.

10. Handling /Storage/Delivery: The manufacture shall have proper facilities for handling

and storage of raw material and finish product. The supplier shall control packing

presentation and marking process so as to ensure conformity to the railway requirement.

* * * * *


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ANNEXURE-H

GOVERNMENT OF INDIA MINISTRY OF RAILWAYS …rdso.indianrailways.gov.in/works/uploads/File/336kw_final draft_27... · GOVERNMENT OF INDIA MINISTRY OF RAILWAYS vuqla/kku vfHkdYi ,oa

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