IR class WAG-7
| IR class WAG-7 | |
|---|---|
 WAG-7 No. 27264 in Tigerface paint
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| Numbering: | BHEL: 24501-24700 CLW: 27001-28770 |
| Number: | 1970 |
| Manufacturer: | CLW . 1570 Stk BHEL 200 pcs. |
| Year of construction (s): | 1992-2015 |
| Axis formula : | Co'Co ' |
| Gauge : | 1676 mm |
| Length over coupling: | 20,394 mm |
| Height: | 4185 mm |
| Width: | 3055 mm |
| Bogie axle base: | 3800 mm |
| Wheel set mass : | 20.5 t |
| Top speed: | 100 km / h |
| Hourly output : | 5350 PS (4000 kW) |
| Continuous output : | 5000 PS (3730 kW) |
| Starting tractive effort: | 44 t (430 kN) |
| Wheel diameter: | 1092 mm |
| Power system : | 25 kV 50 Hz ~ |
| Power transmission: | 2 single arm pantographs type Faiveley AM-12 manufactured by Stone, India |
| Number of traction motors: | 6 × Hitachi HS15250G (hour: 670 kW at 750 V, 960 A and 877 min -1 . Weight: 3.65 t ) |
| Transmission ratio: | 1: 3.55 or 1: 4.06 |
| Locomotive brake: |
Resistance brake , direct brake handbrake |
| Train brake: | Vacuum brake , air brake |
The WAG-7 is an electric locomotive of Indian Railways for operation with 25 kV AC with a frequency of 50 Hz, which in the years 1992 to 2015 Chittaranjan Locomotive Works was built (CLW), 200 locomotives were in Bharat Heavy Electricals ( BHEL) mounted. The designation of the series consists of W for wide ' Breitspur ', A for alternating current 'Alternating current' and G for goods 'Güter' for freight locomotives . A 7 follows the hyphen to identify the 7th generation of WAG locomotives.
The WAG-7 was the electric locomotive series with the most locomotives in India in July 2020 before the record went to the WAG-9 . The successful WAG-7 is based on the well-proven WAG-5 , but has a higher performance than its predecessor and, due to the greater weight, also a higher pulling force. Except for about ten locomotives that were retired due to accident damage or fire, the 2020 series was still in full use.
history
The almost 4000 HP continuous output of the WAG-5 did not meet the increased requirements in operation, which is why a 5000 HP locomotive should be developed. The CLW proposal to build an improved WAG-5 was preferred over BHEL’s proposal. BHEL proposed a solution with phase angle control , which was viewed as not robust enough for the rough operation.
The series was built from 1992 and was a success from the start. The locomotives were manufactured for 23 years, until the last one was built by CLW in 2015, which also meant the end of the manufacture of locomotives with tap changer control in the railway's own locomotive factory.
The WAG-7 are mainly used for heavy block trains for coal , cement , steel , wood , grain , containers and mineral oil products , and less often for passenger trains .
technology
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The WAG-7 is a more powerful variant of the WAG-5. Compared to this series, it has a larger transformer and welded instead of cast bogies. All locomotives traction motors of Hitachi -type HS15250G. This means that a trailer load of 1200 t consisting of modern boxcars with bogies can be transported on a 6 ‰ slope at 100 km / h instead of just 80 km / h as with a WAG-5.
The current is fed from the pantographs to the transformer via a main compressed air switch. Instead of 3900 kVA - transformer WAG-5 was of 5400 kVA transformer from the WAP-4 used, the structure, however, was the same: The transformer consists of an autotransformer , the output voltage with a high voltage tap selector can be changed and a galvanically isolated transformer having fixed transmission 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 .
The WAG-7 locomotives used welded bogies that were derived from the asymmetrical trimount bogies used on the WAG-5. All locomotives have a pawl bearing drive with Hitachi traction motors, a version that is more powerful than the WAG-5H.
The first WAG-7 had the same locomotive bodies with straight end walls as the WAG-5, from 2007 WAG-7 equipment was delivered in WAP-4 car bodies. The conversion of the production took place smoothly, so that only the new box shape was used only from the 2010 locomotive No. 28121.
painting
Initially, the usual paint job on the WAG-7 was a light blue with a yellow stripe in the middle. The paint later changed to a red-white-blue color scheme with a square surface on the forehead, which was painted alternately with diagonal white and red stripes. This so-called tigerface 'tiger face' helped the locomotive to be more visible in operation. In contrast to the older series, the WAG-7 locomotives do not have any individual paintwork from the workshops.
Web links
Individual evidence
- ^ Indian Railways Locomotive Roster List. IRFCA, accessed on August 9, 2020 (English, search for WAG-7 in Withdrawn Locos ).
- ↑ a b c d e f g WAG-7. In: Electric Locomotive Roster: The WAG Series! 24 coaches, May 22, 2016, accessed on August 9, 2020 .
- ↑ WAG-7. In: Locomotives - Specific classes: AC Electric. IRFCA, accessed on August 9, 2020 .
- ↑ a b c WAG7. In: Railworld. Accessed August 9, 2020 (English).
- ↑ a b WAG5. In: Railworld. Accessed August 9, 2020 (English).
- ↑ WAP4. In: Railworld. Accessed August 9, 2020 (English).
- ^ Indian Railways Locomotive Roster List. IRFCA, accessed on August 9, 2020 .