IR class WAP-4
| IR class WAP-4 | |
|---|---|
 WAP-4 No. 22685
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| Numbering: | first WAP-4: 22061 11 locomotives converted from WAP-1 : 22017, 22029, 22051, 22054, 22055, 22057, 22062, 22064, 22066, 22069, 22075
22201–22399 (199 locomotives) |
| Number: | 778 |
| Manufacturer: | CLW |
| Year of construction (s): | 1993-2015 |
| Retirement: | 4 pieces after accidents |
| Axis formula : | Co'Co ' |
| Gauge : | 1676 mm |
| Length over buffers: | 18,794 mm |
| Height: | 4233 mm |
| Width: | 3055 mm |
| Bogie axle base: | 3895 mm |
| Service mass: | 112.8 t |
| Wheel set mass : | 18.8 t |
| Top speed: | 140 km / h |
| Hourly output : | 5220 hp (4500 kW) |
| Continuous output : | 5050 hp (3840 kW) |
| Starting tractive effort: | 300 kN |
| Wheel diameter: | 1092 mm |
| Power system : | 25 kV 50 Hz ~ |
| Power transmission: | 2 single arm pantographs type Faiveley AM-12 manufactured by Stone in India |
| Number of traction motors: | 6 × Hitachi HS15250A (hourly output: 650 kW at 750 V, 855 A and 1070 min −1 . Weight: 3.7 t) |
| Drive: | Pawbearing drive |
| Transmission ratio: | 1: 2.52 |
| Locomotive brake: |
Direct brake handbrake |
| Train brake: | Air brake |
The WAP-4 is an electric locomotive of Indian Railways for operation with 25 kV AC with a frequency of 50 Hz, which in the years 1993 to 2015 the Chittaranjan Locomotive Works were built (CLW). The designation of the series consists of W for wide ' Breitspur ', A for alternating current 'alternating current' and P for passenger 'traveler' for passenger locomotives . A 4 follows the hyphen to identify the 4th generation of WAP locomotives.
history
Indian Railways needed a locomotive to drive passenger trains with 24 to 26 cars that could climb gradients without a sliding locomotive . The light, very fast trains were to be taken over by the WAP-5 that were acquired at the same time .
The previous series of the WAP-4, the WAP-1, was too weak for the heavy express trains, which is why a new series was developed. It used instead of Alstom - traction motors of WAP-1 is the powerful Hitachi -Fahrmotoren as already at the WAG-5H were installed. A more powerful transformer was also installed along with more powerful rectifiers. So that the locomotive did not reach a higher total weight despite the heavy electrical equipment, aluminum was used in many places.
The first WAP-4s were delivered in the locomotive boxes of the WAP-1 and could hardly be distinguished from the outside, later the front windows of the WAP-5 were taken over.
technology
The current is fed from the pantographs to the transformer via a main compressed air switch. Instead of 3900 kVA - transformer WAP 1, a new 5400 kVA transformer was used later in the WAG-7 was used. The transformer consists of an autotransformer , the output voltage of which can be changed with a high-voltage tap selector, and a galvanically isolated transformer with a fixed transformation ratio, both of which are mounted on the same iron core in an oil tank.
The output current of the transformer is fed to the two rectifier blocks, which convert the alternating current into direct current. Each block is designed for a continuous current of 2700 A and is of identical design to the blocks used in the WAG-5 and WAP-4 series.
The output current of the rectifier is fed via smoothing chokes and reversing switches to the six Hitachi traction motors, which are permanently connected in parallel. Field weakening is used in the top speed steps .
painting
All WAP-4 are painted red and black with a yellow or cream colored decorative stripe. The color tones are slightly different depending on the allocation of the locomotives to the workshops .
Web links
- WAP-4. In: Railworld. Retrieved August 10, 2020 .