To convert A to kVA in a three-phase circuit use the following formula. kVA is equal to the square root of 3 (1.732) times amps times volts, divided by 1,000.
Three Phase Transformer
| KVA | 208V | 480V |
|---|
| 45 | 125 | 54.2 |
| 50 | 139 | 60.2 |
| 60 | 167 | 72.3 |
| 75 | 208 | 90.3 |
1 kVA is equal to 1,000 volt-amps and are most commonly used for measuring apparent power in generators and transformers. Amps are a measure of electrical current in a circuit. This means that amps are equal to the kVA times 1,000, divided by the voltage.
Technical Details
| Part Number | MT-ATX-3P-480D-75KVA-208Y120-N3R |
|---|
| Item Weight | 510 pounds |
| Product Dimensions | 30 x 40 x 30 inches |
| Item Package Quantity | 1 |
| Certification | NEMA |
| Three Phase Transformers, Full Load Amperes (FLC) |
|---|
| KVA | 208V | 480V |
|---|
| 225 | 624 | 270 |
| 300 | 832 | 360 |
| 500 | 1387 | 601 |
Single Phase Transformers (see below for 3 phase transformers)
| KVA | 120V | 240V |
|---|
| Amps | Amps |
| 1.0 | 8.3 | 4.2 |
| 1.5 | 12.5 | 6.3 |
| 2.0 | 16.7 | 8.3 |
It is a unit of power and has nothing to do with current. All it means is 1000 VA (or watts in simple DC like cases). You can make 1000 VA in a house hold by drawing 5 amps from 200V or 10 amps from 100V. So we can now say that a 1 KVA load when connected to a 230V supply will darw a current of 4.34 amps.
GENERATOR AMP RATINGS - THREE PHASE EXTENDED
| kVA | kW | 440 |
|---|
| 31 | 25 | 41.1 |
| 38 | 30 | 49.3 |
| 44 | 35 | 57.5 |
| 50 | 40 | 65.7 |
150 KVA @ 480 3 = 180 amps. You can feed it with a 200 but if it's loaded to the gills, it'll push the 200 a bit. 150 KVA @ 120/208 3 = 416 amps.
50 kva is 50000 volt amps which at 240 volts gives you 200 amps, but we all know that you would use a 50 kva to feed more than 1 200 amp service. Let's keep this single phase primary. . . If you use 4.2 times the KVA of the transformer It will give you the full load current of the secondary.
GENERATOR AMP RATINGS - THREE PHASE EXTENDED
| kVA | kW | 480 |
|---|
| 100 | 80 | 120.4 |
| 106 | 85 | 128.0 |
| 113 | 90 | 135.5 |
| 125 | 100 | 150.5 |
For a 7.5 KVA DG set if it is a single phase generator it produces a voltage of 230 volts and the current we can utilise will be 26 amperes @ powerfactor 0.8, and if it is a three phase generator, it produces a voltage of 440 volts between phase to phase and the current we can utilise will be 14 amperes at a
The kW to kVA Formula:
- Apparent power (kVA) x power factor (pf) = actual power (kW)
- e.g. 100 kVA x 0.8 = 80 kW.
- The formula for converting kW into kVA is:
- Actual power (kW) / power factor (pf) = apparent power (kVA)
- 1 ton = 200 BTU/minute.
- 1 ton = 12,000 BTU/hour.
- 1 ton = 3.517 kilowatts.
The primary difference between kW (kilowatt) and kVA (kilovolt-ampere) is the power factor. kW is the unit of real power and kVA is a unit of apparent power (or real power plus re-active power). The kilovolt-amperes (kVa) are the generator end capacity. Generator sets are usually shown with both ratings.
The kW to kVA Formula:
e.g. 100 kVA x 0.8 = 80 kW. The formula for converting kW into kVA is: Actual power (kW) / power factor (pf) = apparent power (kVA)kVA stands for Kilovolt-Ampere and is the rating normally used to rate a transformer. In many circumstances the power required by the load is equivalent to the rating of the transformer expressed in either VA or kVA. For example a 1KW (1000 Watts) load would require a 1kVA transformer @ unity power factor.
| Generator KVA Rating to Amperage Conversion Chart 80% POWER FACTOR |
|---|
| kV•A | kW | 208V |
|---|
| 250 | 200 | 694 |
| 312 | 250 | 866 |
| 375 | 300 | 1040 |
| Generator KVA Rating to Amperage Conversion Chart 80% POWER FACTOR |
|---|
| kV•A | kW | 440V |
|---|
| 438 | 350 | 581 |
| 500 | 400 | 665 |
| 625 | 500 | 830 |
GENERATOR AMP RATINGS - THREE PHASE EXTENDED
| kVA | kW | 120 |
|---|
| 56 | 45 | 271.0 |
| 63 | 50 | 301.1 |
| 69 | 55 | 331.2 |
| 75 | 60 | 361.3 |
Generation is normally 11 KV and Transmission is 66KV, 230KV or 400KV . I= 6000 amps. Distribution transformers are around 10MVA. Same way Currents can be calculated.
