This post about the 3 phase motor current calculation formula explanation. AC three phase amps to kilowatts calculation Calculation with line to line voltage. A standard 3Hp, 208V, 3-phase motor is rated about 11 amps (per phase), so that is why I'm saying it is at least a 3Hp motor on your fan if it is drawing 10 amps per phase (but it could certainly be larger). The 3 phase load current amps formula is explain with a three phase load voltage induction motor nameplate data. https://sciencing.com/how-6453971-calculate-three-phase-amperage.html You need to figure total VA first and then divide by voltage to calculate the amperage, and factor in the 1.73 if balanced across three phases. My calculation was 11500/(1.732x400) = 16.6 Amps per phase ... 16.6 x 3 = 49.8 Amps, so i need a 50 Amp breaker. How to Convert kVA to Amps in Three-Phase Circuits. Enter the power factor of the load. Now, if you look at the “1,000 4 1.732V” portion of this equation, you can see that by inserting the respective 3-phase voltage for “V” and multiplying it by 1.732, you can then divide that quantity into the “1,000” to get a specific number (or constant) you can use to multiply “kW” to get the current draw of that 3-phase load at the respective 3-phase voltage. Current (I): Enter the the current in Amperes (A). From this post learn complete about how to calculate the load current of 3 phase motor. P1 = V1 x I1 = 300V x 130 amps = 39,000 VA or 39 KVA P2 = V2 x I2 = 280V x 120 amps = 33,600 VA or 33.6 KVA P3 = V3 x I3 = 250V x 110 amps = 27,500 VA or 27.5 KVA. A three phase system can be connected to a load such that the amount of copper connections required (and thus the transmission losses) are one half of what they would otherwise be. If i have a power of 11.5 kW and voltage of 400V, what size circuit breaker is needed for three-phase system. If 3200 VA @ 208 is balanced across 3 phases = 8.9 amps. Hi, i'm a little confused about the way to calculate the amp of the circuit breaker for a three-phase system. The total load is 3 × 100W = 300W. The power P in kilowatts (kW) is equal to square root of 3 times the power factor PF times the phase current I in amps (A), times the line to line RMS voltage V L-L in volts (V) divided by 1000: P (kW) = √ 3 × PF × I (A) × V L-L (V) / 1000. I come up with 3200 VA @ 208 volts = 15.4 amps. Calculate the total 3-phase power, or "Ptotal," by adding the power of each phase together: Ptotal = P1 + P2 + P3. A 5 Hp, 208V VFD will be rated about 17 amps (per phase). Consider three single-phase systems each supplying 100W to a load (Figure 3). My measurements were: L1: 260V, 60A, 12.20KW, PF-76 L3: 268V, 56A, 11.10KW, PF-74 L3: 263V, 52A, 10.80KW, PF-79 How can I calculate the total amount of amps & watts being used on this 3 phase panel? A standard 3Hp, 208V VFD will also be rated about 11 amps (per phase). Power factor (cosΦ). Now that I have all the individual line readings, I want to calculate the total amount of watts and amperage being used on this panel by all 3 phases. The three phase power calculator calculates the active and reactive power current from the following parameters: Voltage (V): Enter the phase-to-phase (\(V_{LL}\)) voltage for a 3-phase AC supply in volts. The formula to convert kVA to amps in a three-phase circuit looks like this: Current (A) = Power (kVA) × 1,000 √3 × Voltage (V) So, amps are equal to 1,000 times the power in kVA divided by the square root of 3 (1.732) times the voltage.
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