IR class WDG-4
| WDG-4 | |
|---|---|
.jpg) WDG-4 No. 12029 in the paint of the Krishnarajapuram depot (KJM) in the greater Bengaluru area
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| Numbering: | 12001-12999 70001-70190 |
| Number: | 1188 |
| Manufacturer: |
GM EMD , DLW large components from BHEL and Siemens |
| Year of construction (s): | GM EMD: 1997-1998 DLW: 2002-2017 |
| Axis formula : | Co'Co ' |
| Gauge : | 1676 mm |
| Length over coupling: | 21,240 mm |
| Height: | 4160 mm |
| Width: | 3070 mm |
| Service mass: | 126 t |
| Wheel set mass : | 21 t |
| Top speed: | 120 km / h |
| Installed capacity: | 4000 hp |
| Starting tractive effort: | 540 kN |
| Braking force: | 270 kN |
| Wheel diameter: | 1092 mm |
| Motor type: | EMD 16-710G3B |
| Motor type: | Two clock - V16 with turbocharger |
| Rated speed: | 950 min −1 (8th gear) |
| Power transmission: | electrical , three-phase generator with three-phase asynchronous motors |
| Tank capacity: | 6000 l |
| Number of traction motors: | 6 pieces Siemens 1TB2622-0TB02 |
| Drive: | Pawbearing drive |
| Transmission ratio: | 1: 5.29 |
| Locomotive brake: |
Resistance brake , direct brake handbrake |
| Train brake: | Compressed air brake , brake calculator from Knorr - NYAB |
The WDG-4 , manufacturer designation EMD GT46MAC and EMD GT46ACe for the upgraded version, is a diesel locomotive from Indian Railways with electrical power transmission in three-phase technology . General Motors Electro-Motive Division (GM EMD) manufactured the series in 1997 in two lots , from 2002 it was also built under license by the Diesel Locomotive Works (DLW) in India . The series designation is made up of W for wide ' Breitspur ' , D for diesel , G for goods 'Güter' for freight locomotives and the 4 after the hyphen, which stands for a locomotive with an output between 4000 and 5000 hp .
history
The first 13 locomotives of the WDG-4 series with the numbers 12001 to 120013 were imported, a further eight locomotives with the numbers 12014 to 12021 were assembled from kits from GM EMD in the DLW in Varanasi , with the first locomotive completely manufactured in India having the number 12022 carries.
In the beginning, the WDG-4s were assigned to the Hubli depot in Karnataka , where they were used in front of heavy iron ore trains from Bellary and Hospet to the port of Vasco da Gama . You can approach a train with 58 four-axle BOXN type freight wagons on a 6.6 ‰ gradient and accelerate to 85 km / h on the flat. Up to four locomotives can run in multiple traction, the multiple control works via a 27-pin cable.
technology
The structure of the WDG-4 corresponds to the standard diesel locomotives built by GE EMD for the North American market. They come with a 16-cylinder - two-stroke diesel engine is the EMD series 710 equipped, which could give an output of 4000 hp at the older locomotives.
From summer 2007, the WDG-4 was manufactured in an upgraded version, whereby the power of the diesel engine was increased to 4500 HP and the converters were converted from GTO thyristor technology to IGBT technology. The version is designated by GE EMD as EMD GT46ACe , but has not received a new series designation from Indian Railways. The new version was produced from around locomotive No. 12114.
mechanics
The locomotive is built on a rigid frame. It is supported by four rubber springs on the two three-axle bogies, the frames of which are cast from high-strength steel. GM EMD used the name HTSC , which, according to the manufacturer, means high traction / speed-three axle 'high traction / speed - three axles' . The number of axles is expressed with the letter C as in the axis sequence designation . In Indian Railways documents, the meaning of HTSC is mostly given as High Tensile Steel Cast 'high strength cast steel' . The longitudinal forces are transmitted from the bogie to the locomotive body via a sleeve which is connected to the bogie frame with two control arms so that it can move laterally and which engages around a king pin on the locomotive body.
Powertrain
The diesel engine transfers its power to the main generator, which is flanged directly to the crankshaft . The EMD TA 17 generator consists of the armature with the excitation winding , which generates three-phase alternating current in the two separate stator winding systems . Each winding system supplies the energy to a rectifier bridge attached to the generator . The two bridges are connected in series. Depending on the speed and excitation, the generator delivers between 600 and 2600 V direct current . The direct current is converted by converters into three-phase alternating current of variable frequency and fed to the three-phase asynchronous traction motors , which drive the axles as a pivot drive. The converters were developed by Siemens , the power semiconductors are cooled by heat pipes . A sibas 16 - microprocessor control of Siemens controls the drive train, for the slip control is a directed to the ground radar system used.
Many locomotives are equipped with Auto-Emergency Brakes (AEB) - a system that automatically triggers an emergency brake when driving downhill if the train exceeds a pre-programmed speed. The system is activated by a key and is used, for example, on the steep section of the Braganza Ghats on the border between the states of Goa and Karantaka.
Individual evidence
- ^ Classification of Locos. IRFCA, accessed on August 5, 2020 .
- ↑ a b WDG-4. In: Indian Railways FAQ: Locomotives. IRFCA, accessed on August 18, 2020 .
- ^ Loco Roster Database. IRFCA, accessed on August 18, 2020 .
- ↑ Service Department Elector-Motive Division, General Motors Corporation (ed.): Maintenance Instruction MI 1517 Revision A . November 2002, p. 8 .
- ^ Indian Railways Center for Advances Maintenance Technolgy (Ed.): Handbook on WDP4 / WDG4 Locomotives for Maintenance Staff . Maharajpur October 2013, 19 Undertruck, p. 76 .
- ↑ Service Department Elector-Motive Division, General Motors Corporation (ed.): Maintenance Instruction MI 1517 Revision A . November 2002, p. 9 .
- ^ Indian Railways Center for Advances Maintenance Technolgy (Ed.): Handbook on WDP4 / WDG4 Locomotives for Maintenance Staff . Maharajpur October 2013, 9.1 Traction Alternator, p. 26 .
- ↑ Auto-Emergency Brakes (AEB). In: IRFCA. Retrieved August 18, 2020 .