How to calculate from power ( kW & HP ) to ampere ( I )? 1) Kilo watt (kW) to ampere ( I )įor 3 phase power supply kW = I x V x 1.732 x pfįor 1 phase power supply kW = I x V x pfĮxample : 1 unit compressor size rated 37 kw,415 VAC,3 phase and 80% pf,calculate the full load ampere?įirst we must convert from hp to kW using this formula :Īfter that use the formula kW to ampere :ġ unit induction motor power rated 25 hp,200 VAC,3 phase,90 % power factor,calculated the full load ampere.
We cannot get the actual full load ampere because it depend on efficiency of motor.If electric motors have a higher efficiency rating,it will draw fewer amps, for example a 10 HP motor with a 60% efficiency rating will draw about 65 amps at 230 VAC compared to about 45 amps for a motor with a 80% rating. This time i want share about how to calculated the full load ampere (FLA) of electric motor from their power rated.It not difficult if we know the right formula to get the answer.From this calculation we only can estimate the value of full load ampere.
#Kw to amp formula for 3 phase generator#
Chart shows the estimated output amps of a generator based on operating power and voltage with 0.8. Motor Current Ratings (Single-Phase AC) Motor current ratings based on kilowatt output at 120 and 240 volts single-phase AC with an efficiency of 0.8 and a power-factor of 1.Generally for electric motor size,it rated by horsepower (hp) or kilowatts (kW) unit.We can recognize the electric motor size when refer to their kilowatts or horsepower.So from power (kW/hp), how we can know the full load ampere for electric motor? 3 Phase Generator - kVA / kW / Amp Conversion Chart. Motor current ratings based on kilowatt output at 120, 208, 240, 277, and 480 volts three-phase AC with an efficiency of 0.8 and a power-factor of 1. This formula measures the current draw for all three wires in the three-phase system to calculate the current for a single wire, you need to divide the result by three. P(W) 3 × PF × VL-L(V) The power factor of resistive impedance load is equal to 1. I (A) = P (kW) × 1,000 / V L-N(V) × η × PF × 3 The phase current I in amps (A) is equal to the power P in watts (W), divided by square root of 3 times the power factor PF times the line to line RMS voltage VL-L in volts (V): I(A). Thus, the power P in kilowatts is equal to the current I in amps multiplied by the voltage V in volts, divided by 1,000. This formula measures the current draw for one pair of wires in the three-phase system to calculate the current for all three pairs of wires, you need to multiply the result by three. To convert amps to kilowatts the power formula can be used, which states that I P ÷ E, given that P is the power in watts, I is current in amps, and E is voltage in volts.
Use one of the formulas below for line to line or line to neutral RMS voltages. The formulas to convert kilowatts to amps for a three-phase AC circuit are a little different from the formula for a single-phase circuit. Step 1: Multiply the corresponding voltage according to the formula by the power factor, the current and the root of three. How to Find the Current of a Three-Phase AC Circuit In this example, the 5 kW motor will draw 34.72 amps of current. Try our power factor calculator to get the power factor if needed.įor example, let’s find the current of a 5 kW motor with an efficiency of 75% and power factor of 0.8 at 240 volts. The current I in amps is equal to the power P in kilowatts divided by the voltage V in volts times the efficiency η times the power factor PF. To find the input current required to achieve a certain motor output power accounting for power factor and efficiency, use the following equation. The magnitude of real and reactive together in alternating current power is called the apparent power, and the power factor is the ratio of real power to apparent power. Thus, the current I in amps is equal to the power P in kilowatts divided by the voltage V in volts times the efficiency η. For 3-phase systems, we use the following equation: Again, assuming unity PF and solving this equation for I, you get: I 1,000kW ÷ 1.732V.
To find the input current required to achieve a certain motor output power, use the following equation. Efficiency of the motor η, is defined as the ratio of power output to power input. How to Account for Motor Efficiency and Power FactorĮquipment is often not 100% efficient with power usage, and this must be factored in to find the number of amps consumed for a given output power. So, generating 1 kW of power at 120 volts will draw 8.33 amps of current. For example, find the current of a circuit with 1 kW of power at 120 volts.
0 kommentar(er)
