The Line to Line Voltage V (V) = 746 x P (HP) / (√3 x pf x I (A)) in Volts. In the motor nameplate, the company provides the motor is 15 KW 3 phase induction motor. Taking your motor as an example, if it has a resistance of 0.55Ω between lines, each coil is 3/2*0.55=0.825Ω. See information in block next to the “H.P.”. Is [A] = the current at the secondary coil Ip [A]= the current at the primary coil Note that the electrical power in the primary coil and secondary coil are the same. For three phase amperage - FORGET the term "Total Current". Step 3: Finally divide step 1 and step 2. Motor Starting Current and Voltage Drop Calculator. View wire size charts from the list below. I f.l. Some applications require a motor that can exceed the rated power. Calculate three-phase motor power consumption by multiplying amps by volts by the square root of three (W = AV(sqrt 3). To calculate kVA, you need to enter the known values of voltage and the current into the respective fields. The three phase current for a 10 HP motor is listed as 28 amps at 230 volts. Full-Load Amps: Three-Phase Alternating-Current Motors. Calculation of AC three Phase amps to Kilowatts Line to line Voltage P (kW) = √3 x PF x I (A) x V L-L (V) / 1000, which means that the power in Kilowatts is calculated by the square root of three multiplied by the power factor times the phase current in amps by the line … The following calculators can be used to calculate the motor starting voltage drop and starting inrush current of 3 phase induction motor using infinite source assumption as well when electric utility source impedance data is available. That concept is useless. Line to Neutral Voltage where. Note: The AC voltage V (V) can be measured between the Phase to Phase terminal. For example: A 3.5-horsepower, three-phase motor nameplate lists the motor voltage as 230 volts and the locked rotor code is "K." The range given on the table is 8.0 to 8.99 kVA. The two phase calculations are similar to 1 phase with an additional factor 2 in the denominators. This is a 5 HP 3 phase motor. Calculation of AC three phase Kilowatts to amps Line to line Voltage I (A) = 1000 x P (kW) / (√3 x PF x V L-L (V)). Single-Phase Motors - HP and Full-Load Currents. The full-load current is 7A at 460V. Multiplying by 1,000, the range becomes 8,000 to 8,990 VA. NOTE: Direct Current formulae do not use (PF, 2, or 1.73); Single phase formulas do not use (2 or 1.73); Two phase-four wire formulas do not use (1.73); Three phase formulas do not use (2) * For three-wire, two phase circuits, the current in the common conductor is 1.41 times the current … For example, if A = 5.1A, B = 5.0A, C = 5.2A, you would say, "The current is 5.1A" That phrase means the currents are reasonably balanced and 5.1A is an average number. Mathematical equation: Two-phase Amps = [HP * 746] / [E * %age Efficiency * PF * 2] Example: Determine the current flowing through a two-phase, 0.5 HP, 220 volt motor having an efficiency rating of 90% and a power factor of 0.92. This means that the motor can operate at 100% of its rated power. Motor Circuit Conductor and Voltage Drop Calculator (BETA Version) electrician.com (60 HZ Alternating Current induction type 1-phase & 3-phase, wound rotor, and under 600 volt motors ) Motor AC Voltage: Horsepower (Notes 5 - 9) Phase (Notes 5 - 9) Type of Motor (Note 10) Class of Service (Notes 1 & 2) Duty-Cycle Service (Notes 1 & 2) Power, Voltage, Current & Resistance (P,V,I,R) Calculator. I am calculating the current in a 3 phase 380 V balanced Y system with a single motor load of 746 watts with a power factor of 0.72 and am getting different results when using the approaches suggested above. The formula for kWs three phase is I x E x 1.73 x pf/1000 = 28 x 230 x 1.73 x .9/1000 = 10027/1000 = 10.02 kWs. This video is about 3 phase motor amps calculation Or 3 phase motor current calculation guide. P1, P2, P3 = power of phase 1, phase 2 and phase 3 in watt (W) V = voltage in Volt (V) exemple : V1=230 V in 400 V three-phases circuit I1, I2, I3 = current of phase 1, phase 2 and phase 3 in ampere (A) Cos φ1, Cos φ2 , Cos φ3 = cosinus phi of each phase (without unit) In a three phase AC circuit, the total True or Active power is the sum of the three phase power. Inrush Current Calculator – Three Phase Inductive AC Motor About us Since 1994, Ametherm has provided the most reliable and effective inrush current limiting solutions available. 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. Or the sum of the all three phase powers is the Total Active or True Power. Source: NFPA 70, National Electrical Code, Table 430.250 ... view the Motor Wire Size and Circuit Protection Chart and the Motor Wire Size Calculator.