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For single phase, KVA = (line to ground) * (phase current).

A 75kVA 480 to 208Y/120 volt transformer is a fairly common transformer. I assume this is the type of transformer you are referring to. 75k / 120 = 625 Amps.

As an FYI, the 208Y voltage is the line to line voltage, which is equal to (phase 1) - (phase 2), where the phases are separated by 120 degrees, thus (phase 1) * 1.732

For three phase, kVA = (line to line voltage) * (phase current) *(sqrt 3),

75k / 208 / 1.732 = 208 Amps.

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14y ago
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13y ago

A 150kVA transformer, stepdown from 4160V to 600V, 3 phase, will have 20.8A on the primary side and 144.3A on the secondary side assuming the TX is 100% efficient, they are usually 2-3% losses to noise and heat etc.

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11y ago

To answer this question a voltage must be stated. I = KVA x 1000/1.73 x E. Amps = KVA x 1000/1.73 x Volts.

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12y ago

The formula you are looking for is Amps = kva x 1000/1.73 x Volts.

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12y ago

15 kva is 15,000 volt-amps, that means the volts times the amps equals 15,000, so the amps are 15,000 / 220, or 68 amps.

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15y ago

The formula you are looking for is Amps = kva x 1000/1.73 x voltage = 18 amps

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12y ago

yep

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Anonymous

Lvl 1
4y ago

Divid 17500 wraps by 585 wraps

75 kV divided by 30= 2.5

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Anonymous

Lvl 1
4y ago

200 amps

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Q: How many output amps is a 75 kva transformer?
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