3 Phase Power Formula:
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The 3-phase power formula calculates electrical current (amps) from power (horsepower), voltage, power factor, and efficiency. It's essential for sizing electrical components and ensuring proper system operation in three-phase electrical systems.
The calculator uses the 3-phase power formula:
Where:
Explanation: The formula converts mechanical power (horsepower) to electrical power (watts), then calculates the current required considering system voltage, power factor, and efficiency.
Details: Accurate current calculation is crucial for proper wire sizing, circuit breaker selection, motor protection, and ensuring electrical system safety and efficiency.
Tips: Enter system voltage in volts, power factor (typically 0.8-0.95), and efficiency (typically 0.85-0.95). All values must be positive and within their valid ranges.
Q1: Why convert horsepower to watts?
A: Electrical calculations use watts as the standard power unit. 1 horsepower equals 746 watts, so conversion is necessary for electrical calculations.
Q2: What is power factor?
A: Power factor is the ratio of real power to apparent power, representing how effectively electrical power is being used. It ranges from 0 to 1.
Q3: What is typical efficiency for motors?
A: Motor efficiency typically ranges from 85% to 95% (0.85-0.95), depending on motor size, type, and quality.
Q4: Why is √3 used in 3-phase calculations?
A: √3 (approximately 1.732) accounts for the phase relationship in three-phase systems where voltages are 120 degrees out of phase.
Q5: Can this calculator be used for single-phase systems?
A: No, this calculator is specifically for three-phase systems. Single-phase calculations use a different formula without the √3 factor.