1. What is Phase Current?

Phase Current is the current flowing through each individual phase in a three-phase system. In a balanced three-phase delta connection, the phase current can be calculated from the line current using the mathematical relationship.

2. How Does the Calculator Work?

The calculator uses the Phase Current formula:

Where:

• \( I_{ph} \) — Phase Current (Ampere)
• \( I_{line} \) — Line Current (Ampere)

Explanation: This formula calculates the phase current in a balanced three-phase delta connection system by dividing the line current by the square root of 3.

3. Importance of Phase Current Calculation

Details: Accurate phase current calculation is crucial for proper sizing of electrical components, circuit protection design, and ensuring the safe operation of three-phase electrical systems.

4. Using the Calculator

Tips: Enter the line current value in amperes. The value must be positive and greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between phase current and line current?
A: Phase current is the current flowing through each phase winding, while line current is the current flowing in the transmission lines connecting to the system.

Q2: When is this formula applicable?
A: This formula is specifically for balanced three-phase delta connection systems where all three phases carry equal currents.

Q3: What is the significance of the √3 factor?
A: The √3 factor comes from the trigonometric relationship between phase and line quantities in three-phase systems, specifically the 120-degree phase separation.

Q4: Can this formula be used for star (wye) connections?
A: No, for star connections, the phase current equals the line current (I_ph = I_line).

Q5: What are typical applications of this calculation?
A: This calculation is essential for motor design, transformer sizing, power distribution systems, and industrial electrical system analysis.