These are essentially the same as the WAP-7 units, with some differences in gearing and the control software to make them suitable for freight operations. The first few were imported from ABB (6 fully assembled and 16 in kit form (7 completely knocked down, the rest partially assembled), in 1996). These are numbered 31000 to 31021.
In November 1998, CLW started producing these with indigenous components. The first one, ‘Navyug’ (translated, ‘New Era’), was flagged off on Nov. 14. They have (like the WAP-5 units) GTO thyristor converters and 3-phase asynchronous motors.
Manufacture of the traction motors at CLW started on Jan. 11, 1999. Rated at 6125hp each, two units can haul 4500t trains on gradients of 1:60. A single unit can start a 4700t load (58 BOXN wagons) on a gradient of 1:180 (some CLW documents say 1:150), a great improvement over the WAG-5/WAG-7 locos that were restricted to hauling such loads in sections of gradients 1:200 or less (this was the primary motivation behind the induction of the 3-phase technology for freight locos). Total weight 123t. Continuous power at wheel rims 4500kW (6000hp). Starting TE 520kN; continuous TE 325kN.
They also generally have better adhesion than the WAG-5/WAG-7 locos, partly because of the computerized slip control. Rated top speed is 100km/h. Axles Co-Co. Pantograph has a double collector bar in the Adtranz-built units; the CLW-built units use a pantograph with a single collector pan, as in other AC electrics. Multiple unit operation possible; although the locomotive designs provide for several units to be MU’d together, IR restricts these to just two units being coupled at a time because of dynamic loading restrictions on most bridges.
Auxiliaries from ABB, Landert, Behr, Howden Safanco, etc. Regenerative brakes provide about 260kN of braking effort.
[7/02] So far about 49 are in service (22 imported as mentioned above, the rest from CLW). One (#31008) was damaged by fire while working a train on NR.
- Manufacturers: ABB, CLW
- Traction Motors: ABB’s 6FRA 6068 (850kW, 2180V, 1283/2484 rpm, 270/310A. Weight 2100kg) Axle-hung, nose-suspended.
- Gear Ratio: 77:15 / 64:18
- Transformer: ABB’s LOT 6500, 4x1450kVA.
- Power Drive: Power convertor from ABB, type UW-2423-2810 with SG 3000G X H24 GTO thyristors (D 921S45 T diodes), 14 thyristors per unit (two units). Line convertor rated at 2 x 1269V @ 50Hz, with DC link voltage of 2800V. Motor/drive convertor rated at 2180V phase to phase, 971A output current per phase, motor frequency from 0 to 132Hz.
- Hauling capacity: 4250t
- Bogies: Co-Co, ABB bogies; bogie wheel base 1850mm + 1850mm
- Wheel base: 15700mm
- Axle load: 20.5t
- Unsprung mass per axle: 3.984t
- Length over buffers: 20562mm
- Length over headstocks: 19280mm
- Body width: 3152mmn
- Cab length: 2434mm
- Pantographs: Two Secheron ES10 1Q3-2500.
- Pantograph locked down height: 4525mm