Modern electric locomotive E6ACT – DRAGON
The E6ACT electric locomotive is the first, after a long time, Polish locomotive design, developed by ZNLE S.A. working jointly with EC Engineering and the Electrical Engineering Institute. The locomotive is designed to move heavy freight trains. The project was preceded by a survey of customer needs and considerations reflecting the existing infrastructure in Poland, as the locomotive was designed primarily for the Polish market. The most up-to-date technologies have been included in the locomotive design, and the driver comfort and maintenance standards have been kept at European level.
Basic features of the new locomotive:
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able to move heavy freight trains up to 4000 tonnes, such as those carrying coal, crushed rock aggregates, sand, steel
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able to move trains on lower class tracks
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asynchronous drive – 6 motors with a total power rating of 5 MW
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ergonomically arranged cab and control panel
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double-module air conditioning system
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safety cage and an anti-climbing system protecting personnel in case of collision
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modular design
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anti-slip system
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computer diagnostics system for identifying failure locations and predicting possible failures
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reduced environmental impact
E6ACT Locomotive specifications
| Axle system |
Co'Co' |
|
Masa służbowa |
116 000 kg |
|
Traction voltage: |
|
|
- rated |
3 kV DC |
|
- minimum |
2 kV DC |
|
- maximum |
4 kV DC |
|
voltage protection |
od 4,6kV DC |
|
Supply voltage: |
|
|
- auxiliary drives |
3 x 400 V AC |
|
- control circuits |
110 V DC |
|
Continuous power related to traction motors |
5000 kW |
| Number and power of traction motors |
6x834 kW |
| Maximum train weight |
4000 t |
|
Drive control |
microprocessor |
|
Locomotive diagnostics |
microprocessor-based with displays on control panel |
|
Maximum travelling speed |
120 km/h |
|
Maximum design speed |
140 km/h |
| Steepest grade on which the locomotive is able to start moving while hauling a 4000 t train |
6‰ |
|
The locomotive will be able to haul freight trains: |
|
|
- weighing 3 200 t on 0‰ slope at a speed of |
115 km/h |
|
- 3 200 t on 6‰ slope at a speed of |
58 km/h |
|
- 2 500 t on 6‰ slope at a speed of |
74 km/h |
|
- 2 080 t on 10.2‰ slope at a speed of |
63 km/h |
|
Track gauge |
1435 mm |
|
Nominal tread of wheel |
1250 mm |
|
Overall length |
20 250 mm |
|
UIC gauge |
UIC 505 |
|
Minimum track curve radius |
120m |
|
Minimum hump radius |
300m |
The E6ACT locomotive meets the following requirements with regard to maintenance indicators
|
technical readiness coefficient
|
min. 0,9 |
|
routine inspection frequency
|
10 000 km |
|
periodic inspection frequency
|
50 000 km |
|
distance between major inspections
|
250 000 km + 10 % |
|
distance between routine repairs
|
1 000 000 km |
|
distance between major repairs
|
4 000 000 km |
|
useful life
|
min. 25 years |
Tractive part
The E6ACT has two 3-axle bogies arranged in a Co’Co’ set with individual drive for each axle. The distance between outermost axles is 3900 mm. The tractive force is transferred via a journal mounted on the bogie frame and a pulling tackle that couples the bogie to the vehicle box. The wheel set comprises an axle and a pair of monoblock wheels of 1250 mm nominal tread, provided with brake disks on both sides of each wheel.
Each drive unit comprises an 834 kW asynchronous traction motor, a gear transmission with oblique teeth and a wheel set. The first level of suspension comprises 2 sets of coil springs arranged directly on both sides of the journal box of the wheel set. The second level suspension (vehicle box support on bogies) is formed of a set of large-sized spiral flexicoil springs. Vibration dampening is effected by means of hydraulic shock absorbers.
In order to extend the life of wheels and to improve interaction thereof with the rail, particularly on curved tracks, the locomotive is provided with a wheel flange lubricating system.
Pneumatic system
The pneumatic system of the locomotive comprises the following functional units:
air supply and conditioning system,
The system is supplied with air by two identical single-stage air-cooled screw compressors. Such design improves the reliability of the system.
Brake
The locomotive is provided with a mechanical disk brake on each wheel set and an electrodynamic brake. There is also a spring parking brake enabling to hold the vehicle on a 45 ‰ slope.
Locomotive body
The locomotive body is a self-bearing welded structure. The body features crumple zones and an anti-climbing system providing the highest level of safety. An ergonomic cab of the locomotive for two operators is equipped with a two-module air-conditioning system. In addition the vehicle is furnished with 6 cameras, 4 of which transmit rear mirror view and the remaining two installed on both ends of the locomotive transmit the view of couplers and screw couplings. A modern fire detection and fire extinguishing system is installed on board the locomotive.
High-voltage electric circuits
The main circuit comprises:
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two half-pantograph current collectors installed on the roof of the locomotive provided with a dedicated control system and an auto-drop device that prevents excessive wear of the graphite collector strip,
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an ultrafast new generation DCN-L type vacuum circuit breaker,
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voltage smoothing filters,
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3 drive supply units comprising:
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Chopper-type DC/DC converter for voltage regulation on inverter input. This system enables the locomotive to run with voltage in the overhead contact system higher or lower than rated value.
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Two DC/AC converters - inverters (1 MW each) for generating 3-phase waveforms for providing power to traction motors (one inverter powers one motor). The inverter accomplishes vector control of the motor.
-
DC/DC converter for brake resistor regulates the effective current flowing across that resistor enabling the control of the electrodynamic braking force.
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Current smoothing reactors (one reactor for each of the main circuit groups). Reactors prevent the transfer of interference into the power supply system.
Low-voltage electric circuits
The locomotive is equipped with modern high-class 100Ah FNC batteries operating within the temperature range of -40oC to +50oC. The battery is able to support external lighting for at least 5 hours.
Locomotive control and diagnostics
The system therefore provides full automation of the driving process and maintains the preset speed with an accuracy of 2 km/h, provides locomotive diagnostics, complete visual information and event recording. The information related to service functions is collected by an event recorder coupled to an electronic speedometer. The starting and braking process is controlled by a wheel spin elimination system wherein the starting of the locomotive is effected with maximum allowable tractive force , i.e. if wheels of one axle start slipping, the system automatically reduces the torque transferred onto that axle, and if this is still insufficient, sanding is applied to retain adhesion.
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