1. What is the Current Per Phase Formula?

The Current Per Phase formula calculates the electrical current flowing through each phase in a three-phase system. It is derived from the relationship between power, voltage, and current in balanced three-phase circuits.

2. How Does the Calculator Work?

The calculator uses the Current Per Phase formula:

Where:

• \( I_{phase} \) — Current per phase (amperes)
• \( P \) — Total power (watts)
• \( V_{phase} \) — Voltage per phase (volts)

Explanation: This formula assumes a balanced three-phase system where the power is equally distributed across all three phases.

3. Importance of Current Per Phase Calculation

Details: Accurate current calculation is essential for proper circuit design, cable sizing, protective device selection, and ensuring electrical system safety and efficiency.

4. Using the Calculator

Tips: Enter total power in watts and voltage per phase in volts. Both values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: When is this formula applicable?
A: This formula is used for balanced three-phase systems where the load is equally distributed across all three phases.

Q2: What is the difference between line voltage and phase voltage?
A: In star (wye) configuration, phase voltage is line voltage divided by √3. In delta configuration, phase voltage equals line voltage.

Q3: Can this formula be used for single-phase systems?
A: No, for single-phase systems use I = P/V without the factor of 3 in the denominator.

Q4: What are typical current values in three-phase systems?
A: Current values vary widely depending on application, from a few amperes in small installations to thousands of amperes in industrial systems.

Q5: How does power factor affect current calculation?
A: This formula calculates apparent current. For real current in systems with power factor, additional calculations considering power factor are needed.