Home
Back
Three-phase Power Formula:
| From: | To: |
The three-phase power formula calculates the total power in a balanced three-phase electrical system. It is widely used in industrial and commercial electrical systems for accurate power measurement and system design.
The calculator uses the three-phase power formula:
Where:
Explanation: The formula accounts for the phase relationship in three-phase systems, where √3 represents the relationship between line and phase quantities in balanced systems.
Details: Accurate three-phase power calculation is essential for electrical system design, load balancing, equipment sizing, energy management, and power quality analysis in industrial applications.
Tips: Enter line voltage in volts, line current in amperes, and power factor between 0 and 1. All values must be positive, with power factor typically ranging from 0.8 to 1.0 for efficient systems.
Q1: What is the difference between line voltage and phase voltage?
A: Line voltage is the voltage between any two lines, while phase voltage is between any line and neutral. In star connection, line voltage = √3 × phase voltage.
Q2: Why is power factor important in three-phase systems?
A: Power factor indicates the efficiency of power usage. Low power factor results in higher current for the same power, increasing losses and requiring larger conductors.
Q3: When should this formula be used?
A: This formula applies to balanced three-phase systems with sinusoidal waveforms. For unbalanced systems, individual phase calculations are needed.
Q4: What are typical power factor values?
A: Industrial systems: 0.8-0.95, commercial buildings: 0.85-0.95, residential: 0.9-1.0. Power factor correction may be needed below 0.9.
Q5: Can this formula be used for reactive power calculation?
A: No, this calculates active power. For reactive power, use Q = √3 × V × I × sinφ, and for apparent power, use S = √3 × V × I.