WAP 7 The High Speed Passenger Loco
Indian Railways after successfully adapting to ABB technology of three phase traction started production of WAG 9 and WAP 5 class of electric Locomotive , it was felt that the technology whatever imported and adapted to should be suitable for specific traffic needs in this country . Since this was highly dependent on application software incorporated in its controls, it was felt necessary to develop our own software to suit our specific requirement for particular pattern of traffic. This brought about the birth of TRACTION SOFTWARE DEVELOPMENT LABORATORY at CLW.
THE NECESSITY
Indian Railways have a vast network of 63000 Kms of track and 36.5% of these have been electrified and many more are in the making. IR runs 8000 numbers of passenger carrying trains daily and expects an annual growth of 6% only in passenger traffic. With the meager source and tight finance it has become necessary to run more number of trains within the present line capacity and more number of passengers in each train at high speed.
In simple words IR has to seek for higher productivity from its assets.
WHAT WE DID
CLW took up the challenge and developed a modification of the application software of WAG 9 class of locomotive and developed a new class of locomotive called WAP 7. The loco is identical to WAG 9 except for a change in the application software and gear ratio to suit for higher speed for passenger services.
THE VITAL STATISTICS
| Type of service | Passenger | Length of Cab | 2434 mm |
| Supply System | 25KV. AC, 50Hz | Overall width of body | 3152 mm |
| Class | WAP-7 | Panto locked down height | 4255 mm |
| Track gauge | 1676 mm | Traction Motor Type | 6FRA6068, 3-phase Squirrel cage Induction Motorsl |
| Axle arrangement | Co-Co | Traction Motor mounting | Axle hung nose Suspended |
| Brake system | Air, Regenerative and parking | Gear Ratio | 3.6 (72:20) |
| Total Weight | 123 tonnes | Cont. Power at Wheel Rim | 4500 kW (6000 H.P.) |
| Axle Load | 20.5 t | Starting tractive effort | 323KN |
| Unsprung mass per axle | 3.984 t | Cont. tractive effort | 228 KN |
| Wheel Diameter | 1092mm(New) 1016 mm (fully worn) |
Maximum regenerative braking effort | 182 KN |
| Length over buffers | 20562 mm | Maximum service speed | 140 kmph |
| Length over Head Stocks | 19280 mm | Control system voltage | 110 V DC |
| Bogie CRS | 12000 mm | Drive system | 3 Phase Drive with GTO Thyristor & microprocessor based VVVF control |
| Loco wheel base | 15700 mm | Multiple Unit operation | Max 2 locos |
| Bogie wheel base | 1850 mm+1850mm | Hauling Capacity | 26 Coaches at 140 kmph |
First WAP7 was turned out from CLW on May 2000 and sent to its base at Gomoh/ER
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STEAM
DIESEL
ELECTRIC
MILESTONES Strategy
INNOVATION
3
Phase Technology
WAG-5 WAG-7 WAG9h WAP4 WAP5 WAP7
