3 Phase Autotransformer with module core for vertical mountingDAM 25 - 630kVA according to IEC/DIN EN61558-2-13

overviewtechnical dataPDF data sheet

Typical applications

3 phase autotransformer according to IEC/EN61558-2-13 for general applications without the need of a galvanic isolation, e.g. for transforming typical mains voltage to other voltages needed by tools, machinery or other devices.

Autotransformers do not provide any electrical protection due to the lack of galvanic isolation between input and output windings.

Specifications

3 phase transformer according to EN61558-2-13. protection class I ready. Due to innovative vacuum impregnation in polyester varnish, the noise level is extraordinary low. Screw terminals are contact proof according to BGV A3. Connection bolts are used for currents > 520 A.

Autotransformers are provided for a voltage range from 100 V up to 550 V (special voltage versions on request).

Standard switching matrix: Yan0 (typical star load approx. 10%). If typical star load should reach rated current, switching matrix Zan0 is used.

Please add switching matrix requested when ordering the transformer. Final operation position must allow natural convection through coolant bores. For further information, don´t hesitate to contact us.

Transformer provides loops for safe transportation or craning.

3 Phase Autotransformer with module core

for vertical mounting IEC/EN61558-2-13

Voltage range input / output100 V … 550 V
Rated frequency50/60 Hz
Power range25,0kVA … 630kVA
Output designStandard switching matrix: YNa0

typical star load approx. 10%

Switching matrix – on request: ZNa0

typical star load 100%

Max. ambient temperature40°C
UL-Isolationssystem (optional)OBJY2.E181051
Insulation class (IEC85)B 130°C
Fire protection classUL94HB (V-0 possible)
Degree of protectionIP00
Protection class (ready)I
ConnectionsScrew terminals in according to BGV A3

current > 520A: bolts are used

  • No galvanic isolation
  • Natural convection between primary and secondary winding through coolant bores
  • Number and position of coolant bores depend on transformer ratio and size
  • Windings on glass-fiber reinforced plastic profiles
  • Ready for vertical mounting including angle brackets
  • Transformer completely vacuum impregnated
Rated
power
kVA
Dimensions
approx. mm
Copper
weight
KG
Total
weight
KG
Size
TType and
Ordering No.
A
B
C*
D
E
F
25
540290
490
2 x 180
172
11,0
46
126
440/420 – 80/80
DAS0250
31,5540320490
2 x 180
199
11,0
40145440/420 – 80/107DAS0315
40540350495
2 x 180
229
11,0
42176440/420 – 80/137DAS0400
50540350505
2 x 180
229
11,0
67202440/420 – 80/188DAS0500
63
690360555
2 x 230
222
11,0
86247550/470 – 90/120DAS0630
80690390565
2 x 230
252
11,0
83282550/470 – 90/150DAS0800
1006904205652 x 23028211,0108348550/470 – 90/180DAS1000
1608303908752 x 28022215,0203496680/740 – 120/120DAS1600
2008304208402 x 28025215,0205570680/740 – 120/150DAS2000
2258304508402 x 28028215,0213656680/740 – 120/180DAS2250
2508304808502 x 28031215,0210725680/740 – 120/210DAS2500

Please note

*Dimension “C” indicates a reference value only. Phase current and therefore size of screw terminals used depends on transformer ratio (identical size). For currents > 520 A connector bolts are used.

Explanation and vector-groups to applicate 1 phase and 3 phase autotransformers

Autotransformers do not provide galvanic isolation.

They have electroconductive connection between input and output winding. It`s not allowed to take autotransformers for electrically protective separation.

If difference between input voltage and output voltage is small:

  • mains power may be higher
  • transformed power is lower
  • size can be reduced (core, copper winding)

Since the high-voltage and low-voltage windings in an autotransformer share a common portion of the same winding, the size and material costs can be reduced.

Example shows 90% power saving compared to an isolating transformer

Equation to calculate the requested size:

Example: 1 phase autotransformer / Input voltage 440 V / Output voltage 400 V / „Rated power“ needed for application 5 kVA

Identical equation works with 3 phase transformers.

 

 

 

 

Regarding input/ output “upper“ or „lower voltage“ is independant, voltage related only for 3 phase autotransformers value of phase voltage is important.

Standard circuit design of 3 phase autotransformers is YNa0. Max. load at neutral wire is approx. max. 10% of nominal current (phase current).

If 100% neutral wire load is requested, circuit design ZNa0 is manufactured.

Note: YNa0 design can be used in certain circumstances, if neutral wire at input provides full load and transformer star point is permanently connected to load. Please contact us for further informations!