3 Phase Autotransformer for vertical mountingDAS 5.0 - 35kVA according to IEC/DIN EN61558-2-13

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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.

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. For further information, don´t hesitate to contact us.

Final operation position must allow natural convection through coolant bore. Due to innovative vacuum impregnation in polyester varnish, the noise level is extraordinary low.
Screw terminals are contact proof according to VBG4. Transformer provides 2 loops for safe transportation or craning.

3 Phase Autotransformer for vertical mounting with screw type terminals IEC/EN61558-2-13

Voltage range input / output 100V … 550V
Rated frequency 50/60 Hz
Power range 5,0kVA … 35,0kVA
Output design Standard switching matrix: YNa0

typical star load approx. 10%

Switching matrix – on request: ZNa0

typical star load 100%

Max. ambient temperature 40°C
UL Insulation System (optional) OBJY2.E181051
Insulation class (IEC85) B 130°C
Fire protection class UL94HB (V-0 possible)
Degree of protection IP00
Protection class I ready
  • 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
  • Final operation position must allow natural convection through coolant bores
  • Windings on glass-fiber reinforced plastic profiles
  • Ready for vertical mounting – including angle brackets
  • Transformer connections: Screw terminals according to BGV A3
  • Transformer completely vacuum impregnated
Rated
power
kVA
Dimensions
approx. mm
Copper 
weight
KG


Total 
weight
KG


Size
Type and
Ordering No.
A
B
C*
D
E
F
6,3
360 210
345
264
125
10,0×18,0
12,0
45,0
3UI 300/300/63
DAS0630
8,0 360 225 345
264
140
10,0×18,0
12,9 52,0 3UI 300/300/78 DAS0800
10,0 420 240
395
316
143
12,0×18,0
12,0 62,0 3UI 350/350/73 DAS1000
12,5 420 255
395
316
158
12,0×18,0
14,5 76,0 3UI 350/350/88 DAS1250
16,0
480 270
440
356
157
15,0×22,0
17,9 92,0 3UI 400/400/83 DAS1600
20,0 480 270
440
356
157
15,0×22,0
24,0
98,0 3UI 400/400/83 DAS2000
25,0 480 280 450 356 167 15,0×22,0 31,0 114,0 3UI 400/400/93 DAS2500
30,0 480 300 450 356 184 15,0×22,0 41,0 138,5 3UI 400/400/110 DAS3000
35,0 480 330 450 356 214 15,0×22,0 36,5 161,0 3UI 400/400/140 DAS3500

Please note

*Dimension “C” indicates a reference value only. Phase current and therefore size of screw terminals used depends on transformer ratio (identical size).

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!