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3-Phase Power Formula:
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Three-phase electric power is a common method of alternating current electric power generation, transmission, and distribution. It is more efficient than single-phase power for industrial applications and large motors.
The calculator uses the 3-phase power formula:
Where:
Explanation: The formula calculates real power (active power) in a balanced three-phase system. The √3 factor accounts for the phase difference between the three phases.
Details: Power factor represents the ratio of real power flowing to the load to the apparent power in the circuit. A higher power factor (closer to 1) indicates more efficient power usage, while lower power factors result in higher current for the same real power.
Tips: Enter line-to-line voltage in volts, current in amperes, and power factor (between 0 and 1). The power factor is preset to 0.8 (typical for many industrial loads) but can be adjusted.
Q1: What's the difference between line-to-line and line-to-neutral voltage?
A: In a 3-phase system, line-to-line voltage (VLL) is √3 times the line-to-neutral voltage (VLN). This calculator uses line-to-line voltage.
Q2: What is a typical power factor value?
A: Power factors range from 0 to 1. Typical values are 0.8-0.95 for industrial loads, 0.7-0.9 for commercial buildings, and 0.95-1.0 for resistive loads.
Q3: How does power factor affect power calculation?
A: Lower power factor means more current is required to deliver the same real power, increasing losses in the system.
Q4: Can this be used for single-phase calculations?
A: No, for single-phase systems use P = V × I × PF (without the √3 factor).
Q5: What about unbalanced three-phase systems?
A: This calculator assumes a balanced system. For unbalanced systems, calculate each phase separately and sum the results.