3 phase current calculation formula

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This 3-phase power calculator determines the active, apparent, and reactive power from known RMS voltage, current, and power factor for a symmetrical three- phase system with a balanced load. Example: Three equal inductive loads with a power factor 0.68 are connected in star to a 400 V (line voltage) 50 Hz symmetrical three- phase supply. .
How to use the motor rated current calculator: The above tool requires following data for calculation: Motor Type – Single-phase or three-phase. (Mandatory) Motor rated power in HP or kW. (Mandatory) Input supply voltage. (Mandatory) Motor Efficiency as per nameplate – (if known).
You can use constants that apply to specific single- and 3-phase voltages to calculate current (I) and kilowatts (kW). Let's see how to do this. Single-Phase Calculations. Basic electrical theory tells us that for a single-phase system, kW = (V × I × PF) ÷ 1,000. For the sake of simplicity, let's assume the power factor (PF) is unity. Therefore, the above equation
We calculate the supplied voltage by squaring each of the instantaneous voltages per phase, then add all three values together per segment and then take the square root of that number. You’ll see the three-phase voltage comes out to. 208V for a 120V supply. 380V for a 220V supply. 398V for a 230V supply.