Three Phase Current Formula:
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The three phase current calculation determines the electrical current required for a 1 horsepower motor in a three phase system. This calculation considers voltage, power factor, and efficiency to provide accurate current requirements.
The calculator uses the three phase current formula:
Where:
Explanation: The formula converts mechanical power (1 hp) to electrical power requirements, accounting for three phase system characteristics and motor efficiency.
Details: Accurate current calculation is crucial for proper circuit sizing, breaker selection, wire gauge determination, and ensuring electrical system safety and efficiency.
Tips: Enter system voltage in volts, power factor (typically 0.8-0.95), and motor efficiency (typically 0.85-0.95). All values must be positive numbers within their respective ranges.
Q1: Why is 746 used in the formula?
A: 746 watts equals 1 horsepower, so this conversion factor translates mechanical power to electrical power requirements.
Q2: What is a typical power factor value?
A: Power factor typically ranges from 0.8 to 0.95 for three phase motors, with 0.85 being a common default value.
Q3: What is motor efficiency?
A: Motor efficiency represents how effectively the motor converts electrical power to mechanical power, typically ranging from 85% to 95% for modern motors.
Q4: Why is √3 used in three phase calculations?
A: √3 (approximately 1.732) accounts for the phase relationship in three phase systems where voltage between phases is √3 times the phase-to-neutral voltage.
Q5: Can this calculator be used for motors larger than 1 hp?
A: This calculator is specifically designed for 1 horsepower. For larger motors, the formula would need to be adjusted by multiplying the numerator by the actual horsepower rating.