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3-Phase Power Formula:
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The 3-phase power calculation formula is used to determine the electrical power consumption of three-phase electric motors and systems. It provides an accurate measurement of real power in balanced three-phase circuits.
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 essential for sizing electrical equipment, determining energy consumption, calculating operating costs, and ensuring proper circuit protection in three-phase systems.
Tips: Enter line-to-line voltage in volts, current in amperes, and power factor (typically between 0.7-1.0). All values must be 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, with values closer to 1 being more efficient.
Q2: Is this formula for balanced or unbalanced systems?
A: This formula is specifically for balanced three-phase systems where all three phases carry equal currents.
Q3: What is the difference between line and phase voltage?
A: Line voltage is measured between any two lines, while phase voltage is measured between a line and neutral. In star connection, line voltage = √3 × phase voltage.
Q4: Can I use this for single-phase calculations?
A: No, for single-phase systems use P = V × I × PF. The √3 factor is specific to three-phase systems.
Q5: What are typical power factor values for motors?
A: Induction motors typically have power factors between 0.7-0.9 at full load, which decreases at lighter loads.