What to check before ordering
At this class the bushings, clearances and cabinet all grow, so a 34.5 kV pad mount is noticeably larger and more expensive than the same kVA at 12470. Lead times are longer because fewer manufacturers build them.
Current at each rating
Three phase full load current on both sides of a 34500 GY/19920 V to 480Y/277 V transformer. The higher voltage side always carries less current for the same kVA.
| kVA | 34500 GY/19920 V side | 480Y/277 V side |
|---|---|---|
| 15 | 0.3 A | 18.0 A |
| 30 | 0.5 A | 36.1 A |
| 45 | 0.8 A | 54.1 A |
| 75 | 1.3 A | 90.2 A |
| 112.5 | 1.9 A | 135 A |
| 150 | 2.5 A | 180 A |
| 225 | 3.8 A | 271 A |
| 300 | 5.0 A | 361 A |
| 500 | 8.4 A | 601 A |
Nameplate full load current, computed from the standard three phase formula. Free to cite with a link to this page. For any rating not listed, use the kVA to amps calculator.
Common questions
What transformer do I need to go from 34500 GY/19920 V to 480Y/277 V
A step down transformer with a 72 to 1 ratio. Solar farms, wind sites, large rural services and utility substations where distribution runs at 34.5 kV to cover distance. Most units for this conversion fall in the 300 to 2500 kVA range.
How many amps does a 34500 GY/19920 V to 480Y/277 V transformer draw
It depends on the kVA. At 100 kVA the 34500 GY/19920 V side carries about 1.7 amps and the 480Y/277 V side about 120 amps. Current is kVA times 1000 divided by the voltage times the square root of three, so the higher voltage side always carries less current for the same kVA.
What should I check before ordering
At this class the bushings, clearances and cabinet all grow, so a 34.5 kV pad mount is noticeably larger and more expensive than the same kVA at 12470. Lead times are longer because fewer manufacturers build them.