PKP series ET21
| PKP series ET21 | |
|---|---|
 A PKP class ET21 locomotive in front of a freight train
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| Numbering: | ET21‑01 to ET21‑658 |
| Number: | 658 |
| Manufacturer: | Pafawag ( Wroclaw ) |
| Year of construction (s): | 1957-1971 |
| Axis formula : | Co 'Co' |
| Gauge : | 1435 mm ( standard gauge ) |
| Length over coupling: | 16,820 mm |
| Height: | 4620 mm |
| Width: | 3005 mm |
| Total wheelbase: | 12,000 mm |
| Service mass: | 120.0 t (type 3E) 114.0 t (type 3E / 1) |
| Friction mass: | 120.0 t (type 3E) 114.0 t (type 3E / 1) |
| Top speed: | 100 km / h |
| Hourly output : | 2,400 kW |
| Continuous output : | 2,040 kW |
| Starting tractive effort: | 258 kN |
| Driving wheel diameter: | 1250 mm |
| Power system : | 3 kV direct current |
| Power transmission: | Overhead line |
| Number of traction motors: | 6 × LKa635 |
| Drive: | Paw camp |
| Brake: |
Westinghouse brake handbrake |
| Control: | Resistance control |
The locomotives of the ET21 series of the Polish State Railways (PKP) are electric locomotives for the transport of freight trains .
PKP series ET21
1955 began with the construction of the first Polish electric locomotive for freight traffic; it received the type designation 3E. As is usual with freight locomotives, it has two three-axle bogies in which all axles are driven, and a gearbox with a gear ratio of 85:24. The maximum speed is 100 km / h.
The series production of the locomotives, which were given the series designation ET21, began in 1957. In 1960 there was a slight change in the design: From the locomotive ET21-70, the service weight was reduced by 6.0 t and the type designation was changed to 3E / 1. A total of 658 ET21 machines had been delivered to PKP by 1971.
The main area of application of the ET21 is freight traffic, occasionally it is used in front of passenger trains.
The successor series ET22 was delivered from 1969 , which then replaced the ET21. Retirement began in the 1970s, but in 2007 there were still 32 ET21 units in the PKP's fleet; all of the type E3 / 1 manufactured from 1960. Most of the remaining locomotives are located in Nowy Sącz , Wrocław , as well as Kraków and Łazy . Locomotive ET21-57 is in the PKP museum collection.
Types 3E and 3E / 1 for industrial railways
Identical locomotives were also delivered to the Przedsiębiorstwo Materiałów Podsadzkowych Przemysłu Węglowego sand railways . There were 14 locomotives of the type 3E and 54 of the type 3E / 1. Part of this is still used by the privatized successor companies.
17 further ET21s took over various private railways from PKP.
technical description
The main frame of the locomotive was manufactured as a welded bridge frame and is designed for a dynamic longitudinal load of 2000 kN. It consists of two longitudinal beams that are stiffened with several cross beams and the buffer beams . The locomotive body is placed on it, which is clad with sheet metal as a steel frame. Three roof parts above the engine room can be removed, the remaining roof parts are welded to the box frame. The engine room has a passage. The high-voltage chamber is located in a locked room in the middle of the machine room. The bogies are also a welded construction and are interconnected with cross couplings . The axle bearings are guided by sliding blocks in the bogie frame and cushioned with coil or leaf springs. The drive is designed in a pawl bearing design with a two-sided drive, the transmission ratio is 24:85. The locomotive brake brakes all wheels of the locomotive on both sides, the compressed air required for this is conveyed by two air compressors with a delivery rate of 105 m 3 / h at a nominal pressure of eight bar.
Pantographs had the locomotive originally pantographs with simple contact strip. This was followed by a surge arrester and the main switch , which was designed as a high-voltage compressed air quick switch. The traction motors, which are designed as externally ventilated series motors , can be switched in the following switching options with a resistance control;
- all six motors in series ;
- three motors each in series, both groups in parallel ;
- two motors each in series, these three groups in parallel.
In addition, there are three field weakening levels with a degree of 76, 60 and 50% for each vector group . Normal operation thus results in twelve continuous driving levels. In the event of a motor fault, operation could only be carried out in series with the undamaged motors. The damaged traction motors were switched off with a disconnector . A reversing gear is available for changing the direction of travel .
Three traction motors each were cooled by a traction motor fan, each driven by two motors. A drive motor fan also cooled the resistors of the control. A generator fed the control circuits and the lighting system of the locomotive, the locomotive and train heating was carried out with 3 kV. In the locomotive there were three radiators with 1 kV heating voltage for each driver's cab.
photos
Museum locomotive ET21-57 in historical livery (2006)
3E-71 (as ET21-71) of the CTL in Mińsk Mazowiecki (2006)
See also
literature
- Paweł Terczyński: Atlas Lokomotyw 2007 . Poznański Klub Modelarzy Kolejowych, Poznań 2007, ISBN 978-83-920757-7-6 .
- Dieter Bätzold, Günther Fiebig E-Locomotive Archive , Transpress-Verlag, Berlin 1970
Web links
Individual evidence
- ↑ Dieter Baetzold, Günther Fiebig E-Lok archive , Transpress-Verlag, Berlin, 1970, page 284