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DIRECTIONS
FOR THE USE OF A THREE PHASE AUTOTRANSFORMER
|
POWER |
INPUT |
OUTPUT |
FREQUENCY |
STANDARDS |
FROM
1kVA TO 500kVA |
220/380/460/480V
|
220/380/460/480V
|
50/60
Hz |
EN
61558-2-1 |
CEI
14-4 |
IEC
76 |
BS
171 |
Execution in self-ventilated
epoxy painted metal enclosure
Protection class
Temperature class
Protection class
Resin impregnated and
tropicalised winding
|
IP23
E (ta max 45°C)
I |
Please follow
the table below to get the best performance from our three phase
autotransformers. The table shows the max. rating available on each output
voltage at a rated ambient temperature of 25°C. Please note that for a
correct operation of the transformer, the max current applied should be not
over the 80% of the max rating shown on the table. This would allow to always
protect the transformer from instant over-charge, keeping temperatures at the
right level, and will guarantee the longest life to the transformer itself.
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|
Power |
out 220V |
out
380V |
out
450V |
out
480V |
5kVA |
13 A |
7 A |
6 A |
6 A |
10kVA |
26 A |
15 A |
12 A |
12 A |
15kVA |
39 A |
22 A |
19 A |
18 A |
20kVA |
52 A |
30 A |
25 A |
24 A |
25kVA |
65 A |
37 A |
32 A |
30 A |
30kVA |
78 A |
45 A |
38 A |
36 A |
40kVA |
104 A |
60 A |
50 A |
48 A |
50kVA |
130 A |
75 A |
64 A |
60 A |
60kVA |
156 A |
90 A |
76 A |
72 A |
80kVA |
208 A |
120 A |
100 A |
96 A |
100kVA |
260 A |
150 A |
128 A |
120 A |
150kVA |
390 A |
225 A |
192 A |
180 A |
200kVA |
520 A |
300 A |
256 A |
240 A |
300kVA |
780 A |
450 A |
380 A |
360 A |
500kVA |
1300 A |
750 A |
640 A |
600 A |
Tables shown are just
an example. Ratings can always be calculated according to these instructions and the voltage
indications on the label of the transformer
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HOW TO CHOOSE THE
CORRECT TRANSFORMER FOR A SINGLE EQUIPMENT
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Ratings one
appliances are indicated in “KW”, while ratings on transformers are always
shown in “kVA”. There is a relation between “kVA” and “KW” (or “HP”) which can vary for any single
appliance. The
relations shown below are just a reference and must be verified with the
distributor of the equipment connected to the transformer or on the related
instructions:
PUMP KVA=
KW / 0,6
AIR CONDITIONING SYSTEM KVA= KW
/ 0,7
MOTOR KVA=
KW / 0,8
SODIUM-DISCHARGE LAMPS KVA=
KW / 0,9
TUNGSTEN LAMPS KVA=
KW
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ELECTRICAL
RELATIONSHIPS
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|
KW =
HP / 0,735
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Power |
VA = A
x V (Ampere
x Volt) |
Current |
A = VA
/ V |
Three
phase Power (approx.) |
kVA = V
x A x 1,73 / 1000 |
Three
phase current (approx.) |
A = kVA
x 1000 / (V x 1,73) |
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