You can use this formula for any load, to choose MCB (Miniature circuit breaker), Fuses and Over Load Relay (OLR) calculation. Calculate three-phase motor power consumption by multiplying amps by volts by the square root of three (W = AV(sqrt 3). [h=3] Have you included your PF correction? It is a type of polyphase system and is the most common method used by electrical grids worldwide to transfer power. This Motor amp electrical calculator & motor electrical cables sizing (Ampacity) free electrical engineering app for electricians is very new on google play store - 2018 April It calculates Ampere for motor 3 phase and 1 phase Calculates Ampere from KW (watt calculator) Converts KW to amps and convert hp to amps (horsepower electrical calculations) Item 2 above You can use a clip on to measure the Lock rotor amps. Power factor (cosΦ). E.g: 5e3, 4e-8, 1.45e12. Hi, i'm a little confused about the way to calculate the amp of the circuit breaker for a three-phase system. The results are then divided by 1000. MCB Current Calculation, OLR, Fuses and Cable size Calculations for 20 Hp Three phase (TP) Induction Motor. Performing a 3-phase power calculation means using a simple formula relating the power to the voltage, current and a power factor describing the efficiency of the circuit. Voltage - Enter the voltage at the source of the circuit. For example, if the motor is drawing 30 amps at 250 volts, you have 30 x 250 x sqrt 3 (about 1.73) = 12,975 watts). V LL = Volts line to line. 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 to line voltage RMS. Here are the Full Load Amp (FLA) values for typical 230VAC and 480VAC 3 phase motors. This lock rotor amps is the highest current draw of the motor because when the rotor is locked impedance is the lowest. I AC1Ø = Current / Amps 1 phase. P (kW) = I (A) × V (V) / 1000. The System line-line voltage is 12,470V. Power Factor 0.8 0.9 0.95 ... = Generator Power (kVA) 75% Continuous Load (kVA) Converting kW to HP kW = HP. Regards. kW to amps calculator * Use e for scientific notation. Amp to Hp conversion chart-table: Select Motor type DCAC – Single phaseAC – Three phase Enter Power mWWkW Select voltage type Line to line voltageLine to neutral […] I AC2Ø = Current / Amps 2 phase. V x I) /1000. Motor Load Calculator. For motors, it is recommended to multiply the nameplate FLA by 1.25 for wire sizing. For example, if there are three 15-amp motors in the circuit, the ampacity rating of the wire feeding the circuit must exceed 15 + 15 + (15 * 1.25) = 48.75 Amps. In Advanced Amps to Watts Calculator, you can calculate the electric power in watts, milliwatts or kilowatts from electric current in amperes, milliamperes and kiloamperes and RMS voltage in volts for DC circuits, AC 1-Phase Circuits and AC 3-Phase circuits having the Line to Line voltage (Delta Connection), Line to Neutral voltage (Star Connection) and Power Factor (P.F). The resulting value is the amount of power, expressed in amps, required at the input side of phase converter. User manuals, specification sheets, CAD drawings and more. Heating, Lights Outlets 3% Motors 2%, 1% preferable Service Entrance to Transformer 2% 8. For the system shown in the picture above, capacitors are rated at 400kVAR at 7.2kV. Convert watts to … There are exceptions to this requirement, which would include interlocks of two or more motors to prevent them from running at the same time. Actually, The calculation of KVA capacity for a Three Phase Transformer is based on Winding Voltage and Amperage information. AC single phase amps to kilowatts calculation RLA - "Running Load Amps" - current drawn during normal operation of electric motor. DC amps to kilowatts calculation. Phasor Orientation: Technic New Member. How to convert from kW to Amperes in just 3 steps: Step 1: Multiply the kW by 1000. V LN = Volts line to neutral. The key difference between working out power for 3-phase and single-phase systems is a factor of the square root of three. Single-phase voltages are usually 115V or 120V, while three-phase voltages are typically 208V, 230V or 480V. The net rating of the bank is 400*3=1,200kVAR. Building Electrical Design Order a. Here’s a simple example of the equation: You’re preparing to drive a three phase low-horsepower motor rated at 10 amps. If i have a power of 11.5 kW and voltage of 400V, what size circuit breaker is needed for three-phase system. 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