IR class WDP-4
| WDP-4, WDP-4B and WDP-4D | |
|---|---|
 WDP-4P 40109 from the Tughlakabad depot
|
|
| Numbering: |
WDP-4: 20000-20102 WDP-4B : 40001-40085 WDP-4D : 40086-40608 |
| Number: |
WDP-4: 100 WDP-4B : 86 WDP-4D : 525 |
| Manufacturer: |
GM EMD , DLW large components from BHEL and Siemens |
| Year of construction (s): | 2001-2011 |
| Axis formula : |
WDP-4: (Bo1) '(1Bo)' WDP-4B: Co'Co ' WDP-4D : Co'Co' |
| Gauge : | 1676 mm |
| Length: | 19,938 mm ( measured over the buffer beam ) |
| Height: | 4140 mm |
| Width: | 3200 mm |
| Total wheelbase: | 17,246 mm |
| Service mass: |
WDP-4: 115.8 t WDP-4B : 121.2 WDP-4D : 123 t |
| Wheel set mass : |
WDP-4: 19.5 t, WDP-4B : 20.2, WDP-4D : 20.5 t |
| Top speed: |
WDP-4: 160 km / h WDP-4B : 140 km / h WDP-4D : 140 km / h |
| Installed capacity: |
WDP-4: 4000 PS WDP-4B : 4500 PS WDP-4D : 4500 PS |
| Starting tractive effort: |
WDP-4: 270 kN WDP-4B : 400 kN WDP-4D : 400 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: |
WDP-4: 4000 l WDP-4B : 5000 l WDP-4D : 5000 l |
| Number of traction motors: |
WDP-4: 4 pieces Siemens 1TB2622-0TB02 WDP-4B and WDP-4D : 6 pieces Siemens 1TB2622-0TB02 or EMD A 2916-8 |
| Drive: | Pawbearing drive |
| Transmission ratio: | 1: 4.53 |
| Locomotive brake: |
Resistance brake , direct brake handbrake |
| Train brake: | Air brake |
The WDP-4 with the manufacturer designation EMD GT46PAC is a diesel locomotive of Indian Railways with electrical power transmission in three-phase technology , which was designed and manufactured in 2001 by General Motors Electro-Motive Division (GM EMD), other locomotives were produced by Diesel Locomotive Works (DLW) built in Varanasi . The series designation is made up of W for wide ' Breitspur ' , D for diesel , P for passenger 'traveler' for passenger locomotives and the 4 after the hyphen, which stands for a locomotive with an output between 4000 and 5000 hp .
history
The first ten WDP-4 with the numbers 20000 to 20009 were imported and assigned to the Hubli depot . While the locomotives with the numbers 20011, 20013 and 20014 were created in the DLW from kits from GM EMD , the locomotive number 20012 was the first to be completely manufactured in India. It differed from the previous locomotives in that it had a GRP cladding around the driver's cab, which was later removed. Series production of the remaining locomotives only started in 2003.
Compared to the WDM-2 locomotives, the WDP-4 are a major technical advance, but there were two shortcomings: one is the restricted view of the track for the drivers when the locomotive is used with the long front end, the other the low tractive effort, because the locomotive was designed with only four instead of six traction motors for weight reasons . The WDP-4 is able to pull light, fast trains, but had problems driving heavy trains that could only be driven with a lot of wheel slip.
The weaknesses of the WDP-4 led to the development of the WDP-4B , which arose from the WDG-4 freight locomotive . It is equipped with six drive motors and develops a little less traction than the WDG-4 because it is lighter. Compared to the WDP-4 , the driver's cab was slightly widened and provided with larger front windows. The rounder shapes of the more aerodynamically designed driver's cab give the locomotive a less grim appearance compared to the WDP-4 .
The numerous complaints from the drivers about the poor visibility when driving with a long front end became known to the public, so India Railways decided to build a version of the WDP-4B with two end cabs , the WDP-4D . The last D in the name of the WDP-4D indicates double cab 'two driver's cabs' . Except for the additional driver's cab, the locomotives are identical to their predecessor series. Some newer locomotives are equipped with cab air conditioning and toilets .
WDP-4 No. 20094
WDP-4B # 40068
technology
The locomotive was built in the three sub- types WDP-4 , WDP-4B and WDP-4D . The WDP 4 is strong with a 4000 PS 16-cylinder - two-stroke diesel engine is of the EMD series 710 equipped and has only four powered wheels - which are arranged against Lokomotiv center axes of each bogie are without traction motors carried out, whereby the locomotive wheel arrangement (Bo1) '(1Bo)' is assigned. In the WDP-4B , the power of the diesel engine has been increased to 4500 hp and six driven axles have been installed, which means that these series have the Co'Co 'wheel arrangement common for six-axle locomotives; the WDP-4D is practically identical to the WDP-4B except for the additional ones Driver's cab. The locomotives are equipped with multiple controls, the commands are transmitted via a 27-pin cable.
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 designation HTSC for the bogies of the WDP-4B and WDP-4D , 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 . The bogies of the WDP-4 are referred to as HTSC-B1 , where B1 , again derived from the axis sequence designation, indicates the missing traction motor on the third axle. 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 bogies 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 encompasses 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 3000 V direct current . The DC current is from Siemens - converters converted into three-phase alternating current of variable frequency and phase asynchronous supplied -Fahrmotoren, as the nose-suspended drive driving the axles.
Individual evidence
- ^ Classification of Locos. IRFCA, accessed on August 5, 2020 .
- ↑ WDP-4. In: Indian Railways FAQ: Locomotives. IRFCA, accessed on August 18, 2020 .
- ↑ WDP-4 (EMD GT46PAC). In: Diesel Locomotive Roster - The WDP And WDG Series! 24coaches.com, January 6, 2014, accessed August 17, 2020 .
- ↑ WDP-4B (EMD GT46PAC). In: Diesel Locomotive Roster - The WDP And WDG Series! 24coaches.com, January 6, 2014, accessed August 17, 2020 .
- ↑ WDP-4D (EMD GT46PAC). In: Diesel Locomotive Roster - The WDP And WDG Series! 24coaches.com, January 6, 2014, accessed August 17, 2020 .
- ↑ Service Department Electro-Motive Division, General Motors Corporation (ed.): Maintenance Instruction MI 1517 Revision A . November 2002, p. 8 .
- ^ Indian Railways Center for Advances Maintenance Technology (ed.): Handbook on WDP4 / WDG4 Locomotives for Maintenance Staff . Maharajpur October 2013, 19 Undertruck, p. 76 .
- ↑ Service Department Electro-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 .