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autotransformers single three phase Brioschi electric transformers
transflormers
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- single-phase transformers
- single-phase autotransf.
- three-phase transformers
- three-phase autotransf.
- three-phase reactance
- protection boxes  
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Information:  
- general technical
- protection with fuses
- over-temperature
- terminology
- connection groups
 
   
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In compliance with CEI14-8 - CE 96-1 - IEC 726 - IEC 989 regulations
three-phase autotransformers
ATT standard

Three-phase autotransformers of ATT series can be made by connecting the star or triangle phases. The autotransformers are used whether as reductors or tension elevators, a cost and dimensions advantage will depend on relation of the output tension.
The most largely used is the star connection (Yn) because the triangle one is less economic, furthermore a star conenction will enable whatever tension relation where as the triangle is viable with relations of tension 1 to 2.
Pe= Pn (1xV1/V2) where:
Pe= equivalent power
Pn= nominal power
V1= inferior tension
V2= superior tension


Technical specifications:
- Voltage ratio 400-230Vac
- insulation class E
- frequency 50/60 Hz.
- open execution, protection level IP00
- ambient temperature 40°C
- either vertical or horizontal execution
- resin impregnated and tropicalised
- electric class of protection l

Essential information for order and offers inquiries:
- power in VA or in KVA
- network tension and frequency
- output tension
- connection type
- ambient temperature
- working ambient conditions

Download brochure


Nominal Tension: 230-400Vac+N (accessibile)
Final code: Esempio : Autotrasformatore trifase da 100KVA 0-230-400Vac = ATT1000

Code Power
Va
Watt loss
Watt
Dv
%
Vcc
%
Dim.
A
Dim.
B
Dim.
C
Dim.
D
Dim.
E
Weight
Kg
ATT050 500 70 6 8 170 180 120 150 70 9,5
ATT075 750 80 5,5 7,5 170 180 120 150 80 11
ATT10 1000 90 5 6,2 170 180 120 150 90 12,5
ATT100 10000 425 3,6 4,4 370 360 220 325 130 85
ATT1000 100K 2370 3 4 700 800 430 455 200 470
ATT125 12500 550 3,6 4,5 420 420 240 375 140 93
ATT15 1500 105 4 6 230 240 130 200 80 14,5
ATT150 15000 670 3,6 4,5 420 420 250 375 150 105
ATT1500 150K 2920 3 4 700 800 470 455 220 620
ATT20 2000 133 3,8 5 230 240 130 200 90 20
ATT200 20000 793 3,5 4,3 420 420 270 375 170 123
ATT2000 200K 3150 3 4 810 650 450 600 310 775
ATT250 25000 950 3,5 4,2 490 480 280 455 170 168
ATT30 3000 170 3,7 4,8 300 300 170 250 100 32
ATT300 30000 1030 3,5 4,3 490 480 320 455 210 193
ATT3000 300K 4230 3 4 810 1000 450 600 310 890
ATT40 4000 193 3,7 4,8 300 300 180 250 110 38
ATT400 40000 1200 3,3 4,2 580 620 330 455 160 250
ATT50 5000 215 3,5 4,6 300 300 200 250 120 45
ATT500 50000 1520 3,3 4,3 580 620 33 0455 160 270
ATT75 7500 370 3,5 4,4 370 360 200 325 110 60
ATT750 75000 1950 3,3 4,2 580 620 350 455 180 355
Dv: tension drop from vacuum to full load - Vcc: short-circuit tension.