Autotransformers
Function
An autotransformer is a special type of transformer in which the primary and secondary windings are electrically connected. As a result, the device operates without galvanic isolation between circuits. This solution is ideal for applications requiring voltage transformation with high efficiency, including interconnection of networks with different voltage levels and motor starting systems. The applied design significantly reduces the transformer’s internal power, which directly translates into lower weight, smaller dimensions and a more attractive price compared to a conventional transformer of the same rating.
An autotransformer is a special type of transformer in which the primary and secondary windings are electrically connected. As a result, the device operates without galvanic isolation between circuits. This solution is ideal for applications requiring voltage transformation with high efficiency, including interconnection of networks with different voltage levels and motor starting systems. The applied design significantly reduces the transformer’s internal power, which directly translates into lower weight, smaller dimensions and a more attractive price compared to a conventional transformer of the same rating.
It should be noted, however, that the lack of galvanic isolation results in the transfer of disturbances between the sides and limits resistance to short-circuit currents. An autotransformer also does not allow changing the network configuration, for example from IT to TN-C.
Benefits
- Significantly lower weight and compact dimensions
- Lower cost compared to conventional transformers
- High energy efficiency due to reduced internal power
Applications
- Railway industry
- Marine industry
- Renewable energy sources
- Oil & gas industry
- Heavy and mining industry
- Power electronics and drive systems
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:
- Railway Industry
- Oil & Gas Industry
- Mining Industry
- Maritime Industry
- Heavy Industry
- Power Electronics and Drive Systems
- Renewable Energy Sources
Details:
| Design | Three-phase autotransformers EA3 are produced in accordance with requirements of standard: EN/IEC 61558-2-1 |
|---|---|
| Insulation class |
B(130oC) - standard up to 5 kVA; F(155oC) - standard above 5 kVA |
| Climatic class/ Environmental class |
C1/E0 - land design; C2/E1 - maritime design |
| Ambient temperature | 40oC |
| Protection degree | IP 00 lub 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
 |
 |
| Standard design | |
Dimension table
Technical data of three-phase autotransformer type EA3
| Type of autotransformer | Core power factor / Outgoing power [kVA] |
Example date | L [mm] |
B [mm] |
H [mm] |
d [mm] |
e [mm] |
f [mm] |
Weight [kg] |
|---|---|---|---|---|---|---|---|---|---|
| EA3 | 0,05/0,1 | 3x500V/3X380V Yan0 | 100 | 46 | 82 | 80 | 31 | 5 x 8 | 0,9 |
| EA3 | 2,1/12,3 | 3x400-343-336-329V Yan0 | 290 | 255 | 175 | 258 | 160 | 9 x 13 | 19 |
| EA3 | 12/25 | 3x380V/3x300V Yan0 | 420 | 225 | 415 | 370 | 182 | 11 x 15 | 94 |
| EA3 | 30/70 | 3x380V/3x220V Yan0 | 480 | 375 | 475 | 430 | 220 | 11 x 15 | 159 |
| EA3 | 180/360 | 3x100v/3x500v Yan0 | 870 | 430 | 765 | 560 | 770 | 17 x 25 | 734 |
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.
portable IP23
