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3 Phase Motor Power Formula:
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The 3 Phase Motor Power Calculation Formula is used to calculate the real power consumed by a three-phase electrical motor. It provides an accurate measurement of power consumption based on voltage, current, and power factor.
The calculator uses the 3-phase power formula:
Where:
Explanation: The formula calculates the real power in a balanced three-phase system, accounting for the phase relationship between voltage and current through the power factor.
Details: Accurate power calculation is crucial for motor sizing, energy consumption analysis, electrical system design, and determining operational efficiency of three-phase motors.
Tips: Enter line voltage in volts, line current in amperes, and power factor (between 0 and 1). All values must be valid positive numbers.
Q1: What is power factor and why is it important?
A: Power factor represents the ratio of real power to apparent power. It indicates how effectively electrical power is being used. A higher power factor means more efficient power usage.
Q2: What is the difference between line voltage and phase voltage?
A: In a three-phase system, line voltage is the voltage between any two lines, while phase voltage is the voltage across each phase winding. For a balanced wye system, line voltage = √3 × phase voltage.
Q3: Can this formula be used for unbalanced three-phase systems?
A: This formula is designed for balanced three-phase systems. For unbalanced systems, power must be calculated for each phase separately and then summed.
Q4: What are typical power factor values for motors?
A: Induction motors typically have power factors between 0.8-0.9 at full load, which decreases at lighter loads. Synchronous motors can operate at unity or leading power factors.
Q5: How does motor efficiency relate to power calculation?
A: The calculated power is the electrical input power. Mechanical output power is input power multiplied by motor efficiency. Efficiency accounts for losses in the motor.