Home
Back
Three-Phase Power Formula:
| From: | To: |
Three-phase power is a common method of alternating current electric power generation, transmission, and distribution. It is more efficient than single-phase power for large industrial applications and motors.
The calculator uses the three-phase power formula:
Where:
Explanation: The formula calculates the real power in a three-phase system, accounting for the phase difference between voltage and current through the power factor.
Details: Accurate three-phase power calculation is essential for sizing electrical equipment, determining power consumption, calculating energy costs, and ensuring electrical system safety and efficiency.
Tips: Enter line-to-line voltage in volts, current in amperes, and power factor (between 0 and 1). All values must be valid (voltage > 0, current > 0, 0 ≤ PF ≤ 1).
Q1: What is the difference between line-to-line and line-to-neutral voltage?
A: In a three-phase system, line-to-line voltage is between any two phases, while line-to-neutral is between any phase and neutral. For balanced systems, line-to-line is √3 times line-to-neutral.
Q2: What is power factor and why is it important?
A: Power factor is the ratio of real power to apparent power (0 to 1). A lower PF means more current is needed for the same real power, increasing energy losses.
Q3: When is three-phase power used?
A: Three-phase power is typically used for industrial applications, large motors, and power distribution due to its efficiency and ability to provide constant power.
Q4: Can this formula be used for single-phase power?
A: No, single-phase power uses P = V × I × PF (without the √3 factor). This calculator is specifically for three-phase systems.
Q5: What are typical power factor values?
A: Motors typically have PF of 0.8-0.9, resistive loads have PF=1, and heavily inductive loads can have PF as low as 0.3.