IR class WDG-5
| WDG-5 | |
|---|---|
 WDG-5 No. 50001 Bheem
|
|
| Numbering: | 50001-50007 |
| Number: | 7th |
| Manufacturer: | GM EMD , DLW |
| Year of construction (s): | 2012-2017 |
| Axis formula : | Co'Co ' |
| Gauge : | 1676 mm |
| Length over coupling: | 22,262 mm |
| Height: | 4386 mm |
| Width: | 3250 mm |
| Trunnion Distance: | 14,610 mm |
| Bogie axle base: | 3905 mm |
| Total wheelbase: | 17,912 mm |
| Service mass: | 134 t |
| Wheel set mass : | 22.3 t |
| Top speed: | 90 km / h |
| Installed capacity: | 5500 hp |
| Starting tractive effort: | 560 kN |
| Wheel diameter: | 1092 mm |
| Motor type: | EMD 20-710-G3B-ES |
| Motor type: | Two clock - V20 with turbocharger |
| Rated speed: | 904 min −1 (8th gear) |
| Power transmission: | electric , three-phase generator with three-phase asynchronous motors , group drive |
| Tank capacity: | 7500 l |
| Number of traction motors: | 6 pieces EMD A2921-6 |
| Drive: | Pawbearing drive |
| Transmission ratio: | 1: 4.55 |
| Locomotive brake: |
Resistance brake , direct brake handbrake |
| Train brake: | Compressed air brake , brake computer CCBII-IR from Knorr - NYAB |
The WDG-5 , manufacturer designation EMD GT50AC , is a large diesel locomotive from Indian Railways with electrical power transmission in three-phase technology . It was developed by the Diesel Locomotive Works (DLW) in collaboration with the Research Design and Standards Organization (RDSO), the research and development division of Indian Railways. The work was supported by General Motors Electro-Motive Division (GM EMD). Only seven of the series were built between 2012 and 2017 and are used in heavy freight traffic. The series designation is composed of W for wide ' Breitspur ' , D for diesel , G for goods 'Güter' for freight locomotives and the 5 after the hyphen, which stands for a locomotive with an output between 5000 and 6000 hp .
history
The series is a more powerful variant of the WDG-4 . The drive train corresponds to that of the EMD SD80MAC , of which only 37 were sold in North America. It was the most powerful diesel locomotive in India when it was delivered. The locomotive was equipped with the most modern equipment at the time. This also includes a driver's cab designed according to collision protection guidelines with air conditioning and a toilet for the drivers. The view of the track is very limited when driving with the long front end, even more so than with the WDP-4 and WDG-4 series. During the test phase there were problems with driving behavior and with the fulfillment of the specifications regarding the performance, so that the acceptance phase lasted longer than usual. The series was approved in December 2013. All WDG-5 are assigned to the Sabarmati depot (SBT) near Ahmedabad .
technology
Diesel engine
The WDG-5 is equipped with a 20-cylinder - two-stroke - diesel engine of the EMD series 710 equipped, capable of delivering a power output of 5500 hp. The exact type designation reads 20-710-G3B-ES , with G indicating the engine generation in EMD - the predecessor engine series was the 645-F , the 3 a with turbocharger equipped locomotive engine and the B to an improvement in fuel consumption compared to of the A versions.
The E after the hyphen represents electronic fuel injection , electronic controlled fuel injection ' , which the timing and duration of injection is determined - the mechanical energy for the atomization of the fuel is carried by the camshaft driven injection pump in which each cylinder separately associated pump- Nozzle system generated.
The S stands for split cooling 'separate high and low temperature coolant circuit ' . The high-temperature coolant circuit dissipates the heat from the first intercooler stage and the cylinders in the engine block , the low-temperature cooling circuit that from the second intercooler stage and the oil pan .
mechanics
The locomotive is built on a rigid frame. It is supported by four rubber layer springs on the two rocking three-axle bogies, the frames of which are welded together from high-strength cast steel parts . GM EMD describes the design as high tensile cast fabricated , welded from high-strength cast iron . The rubber springs are arranged on the side member of the bogie between the axles at the points where the cross members are connected to the side members. The bogie frame is supported by twelve soft coil springs on the axlebox bearing carrier - two per carrier.
The longitudinal forces are transmitted from the bogie to the locomotive body via a sleeve which is hinged laterally movably behind the first cross member of the bogie frame with two links and 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 generator type EMD TA-20 MBF 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 and can deliver a direct current of 1575 A at a voltage of 2450 V in the 8th gear . 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.
literature
- RDSO (Ed.): Final speed certificate WDG-5 . Lucknow December 27, 2013 ( archive.org [PDF]).
- Progress Rail (Ed.): GT50AC Freight Locomotive . Manufacturer's data sheet. ( scene7.com ).
Individual evidence
- ^ EMD to deliver high-power diesel locomotives to Indian Rail. In: Railway Technology. September 29, 2011, accessed August 18, 2020 .
- ^ Classification of Locos. IRFCA, accessed on August 5, 2020 .
- ↑ Kevin Burkholder: Conrail's SD80MACs. Retrieved August 19, 2020 .
- ↑ Testing Directorate RDSO (Ed.): Oscillation trials of WDG5 class of locomotive over BE-MB section of Northern Railway . 3. Design feature of bogie, p. 1 ( archive.org [PDF]).
- ↑ RDSO (Ed.): Bogie maintenance instruction for 5500 hp WDG-5 locomotive . March 2012 ( archive.org [PDF]).
- ↑ DLW (Ed.): WDG-5 Operator's Manual . Varanasi, Locomotive Data specification, pp. 1–7 ( archive.org [PDF]).