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Three Phase Power Formula:
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The three phase power formula calculates electrical current (amperage) from power (kilowatts), voltage, and power factor in a three-phase AC electrical system. It is essential for electrical engineering and power system design.
The calculator uses the three phase power formula:
Where:
Explanation: The formula converts kilowatts to watts (×1000), then divides by the product of voltage, square root of 3 (for three-phase systems), and power factor to calculate current.
Details: Accurate current calculation is crucial for proper electrical system design, circuit breaker sizing, wire gauge selection, and ensuring electrical safety in three-phase power systems.
Tips: Enter power in kilowatts, voltage in volts, and power factor (0 to 1). All values must be valid (positive numbers, power factor between 0 and 1).
Q1: Why is √3 used in three-phase calculations?
A: √3 (approximately 1.732) accounts for the phase difference in three-phase systems and converts between line-to-line voltage and phase voltage.
Q2: What is power factor and why is it important?
A: Power factor represents the ratio of real power to apparent power. It's crucial because it affects the actual current flowing in the system and impacts efficiency.
Q3: What are typical power factor values?
A: Power factor typically ranges from 0 to 1. Industrial loads often have 0.8-0.9, while heavily inductive loads can have lower power factors.
Q4: Can this formula be used for single-phase systems?
A: No, for single-phase systems use: I = (kW × 1000) / (V × PF) without the √3 factor.
Q5: Why convert kW to watts in the formula?
A: The formula requires consistent units. Since voltage is in volts and current in amperes, power must be in watts (1 kW = 1000 watts).