* Electric motor drive system with a diesel engine and alternator for higher performance with a compact engine and electric equipment in a 20 m car body
* Introduction motor drive with Gate Turn Off (GTO) thyristor inverters for compact driving system configuration
* Six driving axle system for more tractive effort and higher acceleration
* Individual axle control with inverters and microprocessors for improved average adhesive coefficient through smooth re-adhesion control
* 10 km/h higher curve-passing speed using B-B-B bogie configuration and improved suspension
* Combination of electric-command automatic air brake, rheostatic brake
* Driver console monitor display of power circuit condition to improve locomotive handling
* I-ugh reliability and less maintenance using latest technologies
2.2 Technical Aspects
(1) Traction system
There are two engines and two symmetrical power circuits in the locomotive. These two symmetrical circuits are installed for system redundancy, which means that the locomotive is able to continue operation with reduced power even when one of the two engines or power circuits fails.
Fig. 2.1 shows the power circuit of the locomotive. The diesel engine (Model 12V396TE14, made by MTU, a German manufacturer) directly drives the motor-alternator. The alternator's three-phase AC output is rectified by a diode bridge circuit to DC power with variable voltage. A smoothing reactor for electrical separation of inverter circuits from alternator circuits connects three inverter circuits for individual motor control of each axle.
The diesel engine's rotational speed is controlled and stabilized by an electronic governor from 850 rpm to 1800 rpm, in accordance with a notch command from the driver's console. To reduce noise in the lower output power range, the rotational speed increases almost in proportion to the increase of output power.
DC circuit voltage is also controlled in steps from 1200 V to 1900 V by the field current of an alternator exciter governed by the notch command. The alternator exciter field current is therefore greater when the rotational speed and output power are lower.
The auxiliary power supply output is connected to auxiliary motors such as the cooling blower motors for traction circuits. It is also connected to the DC part of the traction circuit
