i.e if a machine stated 25kw 3 phase, what would the current per phase being drawn be? Line to neutral voltage. Full load current calculation for a 3-phase AC supply: 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. V x I) /1000. Learn other top 100 useful Basic Electrical Engineering formulas DC Calculation formula The diagram and table below can be used to convert amperage between single phase and three phase equipment and vice versa. 2. CALCULATION OF TOTAL POWER IN A THREE PHASE SYSTEM. just a quick one guys, forgotten how to do the calc to convert 3 phase kw to amps. Using the formula (kW = 1.73 * volts * amperes * power factor/1000) we can plug in the numbers so the equation looks like, kW = 1.73 * 230 * 75 * .95/1000. The following formula calculates total power in a three-phase system based on KW and KVAr or voltage and current. 3 phase motor current calculation formula is P/(â3xVxPfxEff) or P/(1.732xVxPfxEff) Both are the same. Example - Power Supply to Electric Heater. Find the kW consumption of the following 3-phase motor circuit that has a voltage of 230 VAC, a current draw of 75 amperes and a power factor rating of .95. The kW in your formula is the three phase kW, so I think you should be using 746 (not 249). 10 kW of power is required by an electric heater. You did not mention the voltage. ... For a motor LRA 117 amp 230 volt three phase how many amps for safety box and the contactor. To find the KVA or KW rating (at 0.8PF) for your application, select the 50HZ three phase L-L (line to line) voltage level being utilized. Reply. Scan the row to the left and find the KVA and KW â¦ Calculation of AC three phase Kilowatts to amps Line to line Voltage I (A) = 1000 x P (kW) / (â3 x PF x V L-L (V)). Single- phase loads are connected to one leg of the wye between line and neutral. And specify the load power factor (pf) (cosÎ¦) when the load is specified in kW or hp. For a three-phase AC circuit, if the line to line voltage is known, kilowatts can be calculated from ampere using the following formula. Select the phase arrangement: 1 Phase AC, 3 phase AC, or DC. You can easily find electric power in watts by using the following electric power formulas in electric circuits. Reply. Where: V is the voltage (volts) and I is the current (amps). Formula and explanation. Single & Three Phase Line kVA calculator is an online tool used in electrical engineering to measure the unknown quantity by two known quantities applied to the below formulas for single phase and three phase connection. Calculate the total 3-phase power, or "Ptotal," by adding the power of each phase together: Ptotal = P1 + P2 + P3. print Single Phase vs. Three Phase AC Diagram . The equation to calculate current in 2 Ï circuits is identical to the 1 P with the difference of factor 2 in the denominator. You can compute amps by using this formula,KW = I x V x 1.732 x P.F/1000 (Three phase)KVA = I x V x 1.732/1000 (Three phase) How much amp equals 1 kw with 380 volts? 1. Single phase power input in this instance is 17.32 Amps. x I L) / 1000 Where V L and I L are the RMS value of the applied line voltage and line current respectively and P.F. Solution: The apparent power is The Wye configuration is used to distribute power to everyday single-phase appliances found in the home and office. Three Phase AC â kW to amps. P = 3*V phase *I line * Cos (pi) Here the voltage is considering as line to neutral voltage and current is line current. This task is not as easy as you may think. A three-phase motor can be regarded as a balanced Y-load. Amps (AC single phase) to kW formula: P(kW) = PF × I(A) × V(V) / 1000. Determine the power factor of the motor. This will equal 28.350 KW. In this post, you'll learn the formulas to find amps from kW in dc, single phase ac, and three phase ac circuits. Wako says: at . Line to Neutral Voltage The formula to convert kVA to amps in a three-phase circuit looks like this: Current (A) = Power (kVA) × 1,000 â3 × 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. Seriously, depending on the application this could be very dangerous. Three-phase real power in kW is. It means that the phase current in amps is computed by 1000 multiplied by the power in kilowatts divided by the square root of three multiplied by the power factor times the line to line voltage RMS in volts. Example: the following figure presents a nameplate of a three phase transformer. To calculate kVA, you need to enter the known values of voltage and the current into the respective fields. Calculate three-phase motor power consumption by multiplying amps by volts by the square root of three (W = AV(sqrt 3). Using the above example: Ptotal = 39KVA + 33.6 KVA + 27.5 KVA = 100.1 KVA. Single phase to 3 phase power calculation input requirement = The square root of 3 (1.732) x 10 amps = 1.732 x 10 amps = 17.32 Amps. ... Sir i have lode 132 kw three phase witch size mm cable proper work. KW is known KW x 1000 V x PF KW x 1000 V x PF x 2 KW x 1000 V x PF x 1.73 Amps when kVA is kVA x 1000 V kVA x 1000 V x 2 kVA x 1000 V x 1.73 ... Three -Phase AC Squirrel- Cage & Horse - Wound -Rotor Single Phase AC power Austin 3901 Woodbury Drive P.O. For three phase motor amps calculation, the below formula is used. Go back to Three phase power measurements â Wye and Delta comparison. Units converter, tool online. P(kW) = â3 × PF × I(A) × VL-L (V) / 1000. The simple formula to calculate the rating of three phase Transformers is: KVA = (â3. Scan down this column to the current needed for your application (select the next higher current rating for more margin). Youâre preparing to drive a three phase low-horsepower motor rated at 10 amps. Box â¦ For calculating three-phase formula we need to multiple by 3. How to convert kilowatts (kW) to amps. Watts(W) and Ampere (Amp) are units of different measures of calculations and hence to calculate how many amps are there in a watt we need to divide Watts(W) with Volts(V). Specify the the phase-to-neutral V LN voltage for a 1-phase AC or DC supply.