| HXD2 , HXD2B , HXD2C | |
|---|---|
| HXD2 2(Bo'Bo') twin unit | |
| Power type | Electric |
| Builder | Alstom (initially) CNR Datong Electric Locomotive / Yongji Xinshisu Electric Equipment[1] |
| Total produced | HXD2 : 180 HXD2B : 500 |
| AAR wheel arr. | HXD2 : 2(Bo'Bo')[2] HXD2B, HDX2C : Co'Co'[3][4] |
| Gauge | 1435mm |
| Minimum curve | 125m[3][4][5] |
| Wheelbase | bogies : HXD2 : 2.600m [5] HXD2B, HDX2C : 2.250m + 2.000m[3][4] |
| Length | coupler distance : HXD2 : 2x19.025m[2] HXD2B, HXD2C : 22.960m[3][4] |
| Width | 2850mm[3][4][5] |
| Axle load | HXD2, HDX2C* : 25t[2][4][5] HDX2B : 25t[3] |
| Locomotive weight | HXD2* : 200t[2] HDX2B : 150t[3] HDX2C* : 150t[4] |
| Electric system | 25kV 50Hz[2][3][4] |
| Top speed | 120km/h (operation)[2][3][4] |
| Power output | HXD2 : 10MW[2] HDX2B : 9.6MW[3] HXD2C : 7.2MW[4] |
| Tractive effort | starting : HXD2* : 760kN [2] HXD2B : 584kN [3] HDX2C* : 570kN[4] |
| Train brakes | regenerative : HDX2 : 10MW max[2] HDX2B : 9.6MW max[3] |
| Notes | |
| * When fully ballasted | |
The HXD2 locomotives are a series of related locomotive classes built by CNR Datong Electric Locomotive and Alstom. The locomotives designs are based on the Alstom Prima electric locomotives, and are a product of a cooperation agreement signed between the two companies in 2004.[6][7] All locomotives are intended for heavy freight work, including coal trains on the Datong Qinhuangdao line (Daqin Railway).
The original HDX2 locomotives are twin unit 2(Bo'Bo') vehicles whereas the HXD2B and HXD2C versions are single unit Co'Co' machines. At the time of their construction the HDX2 and HDX2B locomotives were amongst the most powerful locomotives in the world. The HXD2C is similarly specified to the HDX2B but of reduced power, and with increased localisation of components for lower cost.
The HXD2 was originally described as the DJ4-6000 class.[8]
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The locomotives are designed for heavy haul freight applications (up to 7000t train weights), and to be capable of multiple working of three locomotives. The design is also specified for temperatures down to -40C.[9]
The locomotive is ballasted to a 25t axleload - a reduction to 23t axle load with reduced starting tractive effort is optional.[5]
An order for 180 locomotives was placed (2005),[10] of which the initial 12 would be made in France, then 24 supplied for assembly, the remainder being produced in China.[1] The locomotives are used primarily for coal transportaion,[11] specifically on the Datong - Qinhuangdao railway line.[1]
The first China built locomotive was produced May 23, 2007.[10]
In 2010 the locomotives began to be used on coal trains from Inner Mongolia.[12]
The main structural component is an integrated welded steel main bean and floor, with load bearing side sills. The side walls are of corrugated metal, and the roof of the locomotive is removable. The structure is designed for loads of 3600 kN in tension and 2500 kN in compression. The couplers are designed for up to 4000 kN force.[2]
The drivers cabins are designed for single driver operation. Driver facilities include a separate air-conditioned/heated area with refrigerator, cooking and washing facilities, and seating and beds.[2]
The locomotives use asychronous AC electric motor technology, which drives the axles by a nose suspended drive. The bogies are of welded steel construction, with tractive forces transmitted by a low mounted drawbar. The electrical system consists of a transformers based on ABB Group products with 4 windings for electric traction power supply per transformer. Traction inverters are IGBT semiconductor device based, and of the Alstom ONIX type - each traction motor has a separate inverter/rectifier electrical power system. Electrical power for auxiliary devices is supplied via IGBT converters powered from the same intermediate DC power supply used to power the traction motors. Computer control and monitoring systems are from the Alstom AGATE[note 1] product range.[2]
The HDX2B locomotives are designed for heavy freight mainline work, the design is a single body twin cab locomotive with 6 axles in Co'Co wheel arrangement. The body frame, traction motor power electronics and driver facilities are of a similar design as the HDX2, the six traction motors require a transformer of 12.6 kVA power capacity.[3] The bogie design differs from the HDX2 using a straight welded steel frame[3] rather than the 'mouth' shaped form used in the HXD2.[2]
An order worth €1.2billion (25% Alstom, 75% Datong) for 500 units was made in 2006. The first 100 units were to be built primarily by Alstom,[14] this number was reduced in 2007 to 10 units.[15] The first china built unit was produced in December 2009.[16] The order is expected to be complete by 2012.[3]
The HXD2C are 6 axle Co'Co' freight locomotives which share a similar exterior design with the HXD2B; the individually inverter controlled traction motors, body structure overall structural design also are the same as other members of the series. The locomotive power is reduced to 7.2MW, suitable for trains of 5-6 thousand tonnes.[4] The locomotive can be ballasted to give axleloads from 23 to 25 tonnes.[4]
The HXD2C locomotives are constructed independently by CNR Datong. In December 2010 the first locomotive was produced.[17]
In October 2010 Belorusskaja Železnaja Doroga ordered 12 units of a derived variant of the HXD2 two-section locomotive,[18] to be designated BCG-1.[19]
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