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3 Phase Current Formula:
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The 3 Phase Current Calculation determines the current per phase in a three-phase electrical system. It's essential for proper sizing of circuit breakers, wires, and other electrical components in industrial and commercial applications.
The calculator uses the 3 phase current formula:
Where:
Explanation: This formula calculates the current flowing through each phase of a balanced three-phase system, accounting for both real power and power factor.
Details: Accurate current calculation is crucial for electrical system design, ensuring safety, preventing overloads, and optimizing energy efficiency in three-phase power systems.
Tips: Enter total power in watts, line voltage in volts, and power factor as a decimal between 0 and 1. All values must be positive numbers.
Q1: What is power factor and why is it important?
A: Power factor represents the ratio of real power to apparent power. It's important because it affects the actual current drawn and system efficiency.
Q2: Is this calculation for balanced or unbalanced systems?
A: This formula is for balanced three-phase systems where all phases carry equal current.
Q3: What's the difference between line and phase voltage?
A: Line voltage is measured between any two lines, while phase voltage is measured between a line and neutral. In star systems, line voltage = √3 × phase voltage.
Q4: Can I use this for motor calculations?
A: Yes, but note that motor nameplate power is typically output power, not electrical input power which should be used in this calculation.
Q5: What safety margin should I add to calculated current?
A: Electrical codes typically require a 25% safety margin for continuous loads when sizing conductors and protection devices.