Indian locomotive class WAG-7

WAG 7 / 7H

BHEL-made WAG7 of Erode Loco shed hauling freight
Type and origin
Power type Electric
Builder WAG-7 and WAG-7H : Chittaranjan Locomotive Works(CLW)
WAG-7 : Bharat Heavy Electricals Ltd.(BHEL) and
Total produced WAG-7 : 1970
WAG-7H : 2
Specifications
UIC class Co′Co′
Gauge 5 ft 6 in (1,676 mm)
Bogies ALCO Fabricated
Wheel diameter New:1,092 mm (3 ft 7 in),
Half worn:1,055 mm (3 ft 5 1⁄2 in) and
Full worn:1,016 mm (3 ft 4 in)
Wheelbase 3.8 m (12 ft 5 5⁄8 in)
Length 20.934 m (68 ft 8 1⁄8 in)
Width 3.179 m (10 ft 5 1⁄8 in)
Height WAG-7 : 4.185 m (13 ft 8 3⁄4 in)[1]
WAG-7H : 4.135 m (13 ft 6 3⁄4 in)[2]
Axle load WAG-7 : 20.5 tonnes (20.2 long tons; 22.6 short tons)
WAG-7H : 22 tonnes (22 long tons; 24 short tons)
Loco weight WAG-7 : 123 tonnes (121 long tons; 136 short tons)
WAG-7H : 132 tonnes (130 long tons; 146 short tons)
Electric system(s) 25 kV 50 Hz AC Overhead
Current collection pantograph
Traction motors WAG-7 : Hitachi HS15250A
WAG-7H : Hitachi HS15250G
MU working 4
Loco brake Air, Hand and Rheostatic (Friction)
Train brakes Air, Vacuum and Dual
Safety systems Slip control, Main overload relay, Over voltage relay, No volt relay, Earth fault relay, Low pressure governor, Vacuum Control Governor, Train parting alarms and Brake cylinder cutoff valve
Performance figures
Maximum speed WAG-7 and WAG-7H(design) :
120 km/h (75 mph)
WAG-7H(Actual) : 120 km/h (75 mph)
Power output Max : 5,850 hp (4,360 kW)
Continuous : 5,600 hp (4,180 kW)
Tractive effort WAG-7 starting : 48 tons
WAG-7 continuous : 45 tons?
WAG-7H starting : 91 tons?
Factor of adh. 0.345
Career
Operators Indian Railways
Numbers WAG-7 : 27001-28770 , 24501-24700
WAG-7H : 28024 and 28739
Nicknames SHANTIDAN, EKTA, KARAMVIR, GAJRAJ, SWARNABHA, SARVOTTAM, SAMARPAN, CAUVERY, SAMRAT, PRAYAS & AGRASAR
Locale All over India
Disposition active
WAG-7 (old variant) belonging to Electric Loco Shed, Kazipet

WAG 7 is the name of a type of electric locomotive used in India. It is the 7th class of Wide Gauge's(W) AC charged(A) and Freight-dedicated(G-Goods) locomotives. Built by Chittaranjan Locomotive Works and BHEL, Jhansi to RDSO specifications. WAG7 is an uprated version of WAP-4B locomotive with high capacity transformer, rectifier, traction motor, compressor and other matching associated equipments. On 3 August 1992, the first WAG-7 locomotive was inaugurated and christened the name 'SHANTIDAN' in honor of Mother Teresa. The loco is controlled by a tap changer. Indian Railway is going to achieve 7,000,000 tonnes (6,890,000 long tons; 7,720,000 short tons) of traffic, WAG 7 is the main stay of loco. In the locomotive vehicle market WAG 7 is more economical option and one of the most affordable in the world. Hence, it has the highest production figures of any locomotive in India.

The first 71 of this class initially or still homed at Mughalsarai (MGS) shed and the second was Kanpur (CNB). Some units are retrofitted with Static Converters(STC) instead of Arno Rotary Converters. STCs are more efficient and require less maintenance. Also, STCs have self diagnostics making troubleshooting easier. WAG-7H is a heavy variant of WAG-7. WAG-7H #28739 has thicker under-frames. WAG-7 #27445 has closed-circuit cameras to monitor the pantograph along with a spotlight to illuminate the same at night, green lamps to exchange signals and a single windscreen on either side. New Katni (NKJ) shed has added Overhead Equipment(OHE) monitors. Some WAG-7 units have A.C. cabs, SIV, MPFDCS, MPCS, Single arm pantograph, FDCS, Additional COC, Rear-view mirrors, STS, Daulat Ram's Roof-mounted DBRs, SI, Modified ceilings, Bucket seats, Waist-level headlamps, High-reach pantographs, Vigilance Control Device(VCD), Wireless Multiple Control, Vertical Dynamic Brake Resistor(DBR) and microprocessor control. Some units have their MU cables removed. One unit has SCHUNK pantograph. Some units are assembled at Dahod Workshops. Initially WAG-7 had the body-shell similar to WAG-5 but later on all WAG-7 are/were fitted with WAP-4 shell since this provided more space. WAG-7H have WAP 4 shell since beginning. Older WAG-7s have Tiger Face liveries (Red/Dark Blue on white) but newer WAG-7s by CLW have yellow stripe on blue livery. All BHEL built WAG-7s have Tiger Face livery. Now, even some older WAG-7s are repainted with yellow stripe on blue livery. It is also the most powerful indigenously designed freight-dedicated locomotive in India.

Technical specifications[3]

Traction Motors a variant of the standard HS15250 with higher current rating (thicker wire gauge, better insulation); Motors built by CLW and BHEL. 6 motors in parallel grouping
Traction Motors Class of Insulation for Armature and Field C
Traction Motors Suspension Axle hung and Nose-suspended
Traction Motors Weight 3,650 kg (8,050 lb)
Traction Motors Temperature rise in Armature 90 degrees Celsius (194 degrees Fahrenheit)
Traction Motors Temperature Rise in Field 70 degrees Celsius (158 degrees Fahrenheit)
Traction Motors Temperature rise in Commutator 85 degrees Celsius (185 degrees Fahrenheit)
Traction Motors Coil resistance at 110 degrees Celsius (230 degrees Fahrenheit) of Armature 0.0126 ohms
Traction Motors Coil resistance at 110 degrees Celsius (230 degrees Fahrenheit) of Main pole 0.0117 ohms
Traction Motors Coil resistance at 110 degrees Celsius (230 degrees Fahrenheit) of Inter pole 0.0089 ohms
Traction Motors Continuous rating 630 kW (840 hp), 750 V, 900 A, 895 rpm
Traction Motors rating for 1 hour 670 kW (900 hp), 750 V, 960 A, 877 rpm
Traction Motors Air gap for Main pole 6.35 mm (0.250 in)
Traction Motors Air gap for Inter pole 10 mm (0.394 in)
Gear Ratio WAG-7 : 65:16 and 18:64 and WAG-7H : 65:16
Transformer CCL India, type CGTT-5400, Primary rating (5670 kVA, 252 A) Secondary rating (5400 kVA, 1000V, 5400 A), Tertiary rating 270 V, 32 taps, 12,200 kg (26,900 lb), Forced Oil cooling, Class A Insulation
Rectifiers Two silicon rectifiers, cell type S18FN350 (from Hind Rectifier), 64 per bridge, Continuous rating 2700 A / 1050 V per cubicle, Max starting current 3300 A, Forced air cooling
Pantographs Two Stone India (Calcutta) type AM-12, 235 kg (518 lb) including 4 insulators
Bogie drive arrangement Gear pinion
Current Ratings 1350 A/2min, 1200 A/10min, 960 A/hr, 900 A continuous
Number of sandboxes 8
Permanent shunt 5%
2 Headlights 32 V, 50 W
Lead Acid batteries 50 cells, 110 V(5 hour rating)
Arno Converter Input 216 kVA, 415 V, 1 phase 520 A
Arno Converter Out put 150 kVA, 415 V, 3 phase 210 A, 1485 rpm
2 TRC-2000 type Compressors by Elgi 10.5 kg/cm2 (149 psi)
2 Compressor Motors 30 hp (22 kW), 415 V, 930 rpm
2 Exhauster Motors 7.5 kW (10.1 hp), 415 V, 970 rpm
2 250 RE type Exhausters by Northey 4,500 L/min (990 imp gal/min; 1,200 US gal/min)
2 SF India Ltd. Traction Motor Blowers 276 m3/min (9,700 cu ft/min)
2 Traction Motor Blower Motors by Siemens 415 V, 26 kW (35 hp), 50 A, 2920 rpm
2 PFT-59 type Smoothing Reactors by SF India Ltd. 4,200 m3/min (150,000 cu ft/min)
2 Smoothing Reactor Motors 2.2 kW (3.0 hp), 415 V, 2860 rpm
2 KDBR-1 type Breaking Resistor Blowers by KEC International 510 m3/min (18,000 cu ft/min)
Breaking Resistor Blower Motor 30 kW (40 hp), 450 V, 76 A DC, 3300 rpm
Brushes grade EG1055/BG 1165 (Margnite)
Brushes type 2 split
Brushes size 200 mm × 40 mm × 64 mm (7.874 in × 1.575 in × 2.520 in)
Brushes Wear limit 25 mm (0.984 in)
2 PHMX-40-6 type Rectifier Blowers by SF India Ltd. 3,100–3,200 m3/h (110,000–110,000 cu ft/h)
2 Rectifier Blower Motors 2.2 kW (3.0 hp), 415 V, 4.8A, 2860 rpm
MLBH-60-1-H2 type Coil Cooler Blower by SF India Ltd. 22,200 m3/h (780,000 cu ft/h)
Coil Cooler Blower Motor 22 kW (30 hp), 415 V, 45 A, 1450 rpm
Oil Pump by Best & Co. Pvt. Ltd. 730 L/min (160 imp gal/min; 190 US gal/min)
Oil Pump Motor 32 kW (43 hp), 415 V, 2865 rpm
2 SL 30 type Smoothing Reactors 1250 V, 1350 A
Smoothing Reactor Resistance at 110 degrees Celsius (230 degrees Fahrenheit) 0.00344 ohms

Sheds

  1. Ajni (AJNI)
  2. Angul (ANGL)
  3. Arakkonam (AJJ)
  4. Asansol (ASN)
  5. Bhilai (BIA)
  6. Bhusaval (BSL)
  7. Bokaro Steel City(BKSC)
  8. Bondamunda (BNDM)
  9. Erode (ED)
  10. Jhansi (JHS)
  11. Kalyan (KYN)
  12. Kanpur (CNB)
  13. Kazipet (KZJ)
  14. Lallaguda (LGD)
  15. Ludhiana (LDH)
  16. Mughalsarai (MGS)
  17. Netaji Subhas Chandra Bose Gomoh (GMO)
  18. New Katni Junction (NKJ)
  19. Tatanagar (TATA)
  20. Tughlakabad (TKD)
  21. Valsad (BL)
  22. Vijayawada (BZA)
  23. Visakhapatnam (VSKP)
  24. Khanalampura (KJGY)

Performance

WAG-7 with a gear ratio of 18:64 has the following capacity while hauling BOX wagons (in tonnes):

Level/Grade Start 20 30 40 50 60 70 80 90 100
Level 7500+ 7500+ 7500+ 7500+ 7500+ 7500+ 7500+ 7500+ 5236 3732
1 in 500 5859 5859 5859 5859 5859 5765 4555 3808 2714 2003
1 in 200 4065 4065 4065 4065 3982 3125 2510 2135 1540 1148
1 in 150 3468 3330 3272 3210 3145 2476 1995 1703 1229 916
1 in 100 2669 2294 2265 2234 2201 1736 1401 1198 861 638
1 in 50 1512 1149 1140 1131 1121 879 704 599 419 300

WAG-7 with a gear ratio of 18:64 has the following capacity while hauling BOXN wagons (in tonnes):

Level/Grade Start 20 30 40 50 60 70 80 90 100
Level 7500+ 7500+ 7500+ 7500+ 7500+ 7500+ 7500+ 7500+ 5404 3793
1 in 500 6836 6836 6836 6836 6836 6016 4712 3904 2759 2021
1 in 200 4516 4433 4328 4209 4088 3198 2558 2166 1555 1154
1 in 150 3790 3425 3361 3288 3212 2523 2026 1723 1238 920
1 in 100 2859 2340 2308 2272 2233 1759 1416 1208 866 640
1 in 50 1575 1161 1152 1141 1130 885 708 602 420 300

WAG-7 with a gear ratio of 65:16 has the following capacity while hauling BOXN wagons (in tonnes):

Level/Grade Start 20 30 40 50 60 70 80 90 100
Level 10815 7500+ 7500+ 7500+ 7500+ 7500+ 7500+ 7302 4619 2785
1 in 500 7169 7169 7169 7169 7169 6192 5005 3465 2345 1465
1 in 200 4738 4738 4738 4738 4085 3285 2715 1915 1295 820
1 in 150 3977 3960 3880 3795 3210 2590 2150 1515 1020 645
1 in 100 3002 2705 2665 2625 2225 1805 1500 1055 725 450
1 in 50 1700 1345 1335 1320 1120 905 750 515 - -

WAG-7H has the following capacity while hauling BOX wagons (in tonnes) :

Level/Grade Start 20 30 40 50 60 70 80
Level 6000+ 6000+ 6000+ 6000+ 6000+ 6000+ 6000+ 6000+
1 in 500 6000+ 6000+ 6000+ 6000+ 6000+ 5930 4835 3380
1 in 200 4350 4350 4350 4350 4040 3210 2665 1885
1 in 150 3710 3710 3710 3705 3245 2545 2115 1500
1 in 100 2855 2655 2620 2580 2195 1780 1485 1045
1 in 50 1660 1330 1320 1310 1110 895 745 510

WAG-7H has the following capacity while hauling BOXN wagons (in tonnes) :

Level/Grade Start 20 30 40 50 60 70 80
Level 6000+ 6000+ 6000+ 6000+ 6000+ 6000+ 6000+ 6000+
1 in 500 6000+ 6000+ 6000+ 6000+ 6000+ 6000+ 5005 3465
1 in 200 4835 4835 4835 4835 4085 3285 2715 1915
1 in 150 4135 3960 3880 3795 3210 2590 2150 1515
1 in 100 3060 2705 2665 2625 2225 1805 1500 1055
1 in 50 1730 1345 1335 1320 1120 905 750 515

See also

References

  1. ↑ "Trainweb WAG-7".
  2. ↑ "Trainweb WAG-7H".
  3. ↑ Indian AC electric loco information
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