Starting Autotransformers
Function
Autotransformer starters are primarily used in high-power drive systems where traditional inrush current reduction methods, such as star–delta switching, are insufficient or technically difficult to implement. The use of an autotransformer enables precise reduction of the motor supply voltage during startup so that the current drawn from the network does not exceed permissible values.
Autotransformer starters are primarily used in high-power drive systems where traditional inrush current reduction methods, such as star–delta switching, are insufficient or technically difficult to implement. The use of an autotransformer enables precise reduction of the motor supply voltage during startup so that the current drawn from the network does not exceed permissible values.
If required, a multi-tap version can be provided, allowing selection of the optimal voltage level. By reducing the motor voltage, the autotransformer starter limits peak current values, decreases mechanical stress and protects power sources, including generators, thereby extending the service life of the entire system.
Benefits
- Significant reduction of starting current
- Lower mechanical stress compared to direct-on-line starting
- Protection of the supply network against dynamic effects of inrush currents
- Extended service life of generators and the entire electrical system
Applications
- Marine industry
- Heavy industry
Typical application diagram:
Custom Design
Manufacturing a transformer with parameters other than those specified in the catalogue is possible upon prior consultation.Product code
Product for:
Details:
| Design | Three-phase starting autotransformers EA3R are produced in accordance with requirement of standard: EN/IEC 60726 |
|---|---|
| Insulation class |
F(155oC) - standard |
| Climatic class/Environmental class |
C1/E0 - land design; C2/E1 - maritime design |
| Ambient temperature | 40oC |
| Protection degree | IP 23 |
| Protection class | I |
| Frequency | 50/60 Hz |
| Primary voltage | up to 1000 V |
| Secondary voltage | up to 1000 V |
| Fastening | by means of angles |
Technical sketch
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| Standard design | |
Dimension table
Technical data of three-phase starting autotransformers type EA3R
| Type of autotransformer | Core power factor / Outgoing powerc przechodnia [kVA] |
Sample data | L [mm] |
B [mm] |
H [mm] |
d [mm] |
e [mm] |
f [mm] |
Weight [kg] |
|---|---|---|---|---|---|---|---|---|---|
| EA3R | 0,55/1,5 | 3x240V(50Hz)/3x380V Yan0 | 200 | 220 | 220 | 160 | 180 | 9 x 13 | 11 |
| EA3R | 25/77 | 3x440V(60Hz)/3x290V III | 660 | 650 | 710 | 430 | 600 | 13 x 18 | 205 |
| EA3R | 60/350 | 3x440V(60Hz)/3x215V III | 720 | 650 | 785 | 490 | 600 | 13 x 18 | 315 |
| EA3R | 61/370 | 3x380V(60Hz)/3x270-230V III | 870 | 705 | 845 | 590 | 655 | 13 x 18 | 430 |
| EA3R | 90/480 | 3x380V/3x200V II | 870 | 705 | 845 | 590 | 655 | 13 x 18 | 450 |
Note:
Producent zastrzega sobie prawo wprowadzania zmian wynikających z ciągłego rozwoju oferowanych wyrobów.
Możliwe jest wykonanie transformatora w innej wersji i o innej mocy niż podano w tabeli po wcześniejszym uzgodnieniu.
