singlephase motors, and engineers should, whenever possible, determine the actual full load current load current from the motor rating plate. Single Phase Motors MOTOR RATING Approx. Full Load Current at Line Voltage kW HP 110V ac 220V ac 240V ac 0.07 1/12 2.4 1.2 1.1 0.37 1/2 7.9 3.9 3.6 0.56 3/4 11 5.5 5 0.75 1 15 7.3 6.7 1.1 1.5 21 Howto convert Hp to Amp AC 3 phases in only 3 step: Step 1: Multiply Hp (Horsepower) by 746. Example, if you have 100 hp multiply by 746 and you get 74600. (100Hpx746 = 74600). Step 2: kW to Amps - Conversion, formula, chart, convert and calculator free. Motorstart draws more amperage than run. Higher amp draws make higher heat that can 5 5 3.7 7.5 5.0 3.0 7-1/2 7-1/2 5.5 10.0 7.5 5.0 10 10 7.5 15.0 10.0 5.0 For three phase systems a true full 3-Phase Delta {3 pot system} transformer setup is recommended or one true 3 phase transformer. This system, although much better than an open 100kVA to Amps in case of 120 V (Three Phase) Formula: Amps = (kVA * 1000)/E = (100 * 1000)/ (120*1.73) = 481.69 amps. 100 kVA to Amps conversion formula with solved examples for different voltage levels in case of Single and Three phase AC circuits. Toconvert watts to amps based on DC kilowatts, simply multiply kW x 1,000, then divide the result by the number of volts. A = kW x 1,000. V. In a single-phase AC system, amperage can be determined by multiplying kW x 1,000, then dividing the resulting figure by the result of volts x PF. A = kW x 1,000. (PF x V) Inthis article, we will see motor full load current chart for 3 phase motor, single-phase motor, and direct motor. As a “rules of thumb” amps horsepower rating can be estimated to. 110 volts motor – single-phase : 14 amps/hp. 220 volts motor – single-phase : 8 amps/hp. 220 volts motor – 3-phase : 2.2 amps/hp. 2 Measure the current in each of the phase wires going to the motor, and average them. We measure 41, 42, and 43 amps, giving you an average of 42 amps. 3) Calculate the kVa: kVa = 0.00173 x volts x amps. In our example: kVa = 0.00173 x 230 x 42. kVa = 16.7. 4) Calculate the Kw: Kw = kVa x PF (Power Factor) x 0.01. Fora three-phase AC circuit, if the phase voltage is known, ampere can be calculated from kW using the following formula. For any three-phase AC circuit, Current, I = 1000 x kW / (3 x V ph x P.F.) Where V ph is the RMS Thefollowing formulas can be used to calculate the capacitance of a capacitor in farad and microfarad for power factor correction. C = 159.155 x 106 x Q in kVAR ÷ f x V2 in microfarad. C = 159.155 x Q in kVAR ÷ f x V2 in Farad. or. C = kVAR x 109 ÷ (2π x f x V2) in microfarad. C = kVAR x 103 ÷ (2π x f x V2) in Farad. Themeasurement unit for current is Amperes often used as amps. Formulas to calculate 3 phase AC induction motor starting, running & full-load current. More Resources. More Expert Resources; average of first 50 numbers; 1/2 divided by 1/3; 6C3: 6 choose 3; 30 days after today; LCM of 10 and 15; iZii9i.