How do you calculate the power rating of a transformer?
Use the formula: P(KVA) = (V^2/R)/1000 where R is resistance in ohms. For example, if V is 120 volts and R is 50 ohms, P(KVA) = V^2/R/1000 = (14400/50)/1000 = 288/1000 = 0.288 KVA. Calculate power rating in KVA when you know power in watts and the power factor.
How do you size a 3 phase transformer?
the following figure presents a nameplate of a three phase transformer. It’s rating is 100 KVA….Example:
- Primary Voltages or High Voltages (H.V) is 11000 volts.
- Primary Current (current on High Voltage side) is 5.25 amps.
- KVA = (√3. V x I) /1000= (1.732 × 11000 × 5.25)/1000=100 KVA.
How many amps can a 500 kVA transformer supply?
Three Phase Transformer
| KVA | 208V | 2400V |
|---|---|---|
| 225 | 625 | 54.2 |
| 300 | 834 | 72.3 |
| 400 | 1112 | 96.3 |
| 500 | 1390 | 120 |
What is transformer VA rating?
The VA rating refers to the power distribution rating relative to how much power the transformer can deliver to the load. You then apply the voltage and measure the current that appears across the load. Find the primary and secondary voltage of the transformer by referring to the transformer specifications.
How do you calculate current rating?
Use the formula: P(KVA) = VA/1000 where P(KVA) is power in KVA, V is voltage and A is current in amperes. For example, if V is 120 volts and A is 10 amperes, P(KVA) = VA/1000 = (120)(10)/1000 = 1.2 KVA. Calculate power rating in KVA when you know voltage and output resistance.
How many amps can a 500 kva transformer supply?
How do you read transformer ratings?
A transformer with a 100 VA rating, for instance, can handle 100 volts at one ampere (amp) of current. The kVA unit represents kilovolt-amperes, or 1,000 volt-amperes. A transformer with a 1.0 kVA rating is the same as a transformer with a 1,000 VA rating and can handle 100 volts at 10 amps of current.
How many amps is a 300 kVA transformer good for?
Three Phase Transformer
| KVA | 208V | 4160V |
|---|---|---|
| 200 | 566 | 27.8 |
| 225 | 625 | 31.3 |
| 300 | 834 | 41.7 |
| 400 | 1112 | 56.7 |
How many kVA is 400 amps?
Amp. to kVA, table for conversion, equivalence, transformation (Voltage = 220, AC, 3F):
| How many Amps are: | Equivalence in kVA |
|---|---|
| 100 Amps | 38.11 kVA |
| 200 Amps | 76.21 kVA |
| 300 Amps | 114.32 kVA |
| 400 Amps | 152.42 kVA |