1. What is Current per Phase in 3 Phase Systems?

Definition: This calculator determines the current flowing through each phase in a three-phase electrical system based on the line current and connection type (Delta or Wye).

Purpose: It helps electrical engineers, technicians, and electricians properly size components and analyze three-phase circuits.

2. How Does the Calculator Work?

The calculator uses different formulas depending on the connection type:

Where:

• \( I_{phase} \) — Current through each phase (amps)
• \( I_{line} \) — Line current (amps)

Explanation: In Delta connections, phase current is √3 times smaller than line current. In Wye connections, phase current equals line current.

3. Importance of Phase Current Calculation

Details: Proper phase current calculation ensures correct sizing of conductors, protection devices, and transformers in three-phase systems.

4. Using the Calculator

Tips: Enter the line current in amps and select the connection type (Delta or Wye). The line current must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between Delta and Wye connections?
A: Delta (Δ) connects windings in a triangle, while Wye (Y) connects them at a common neutral point. They have different voltage and current relationships.

Q2: When would I use Delta vs Wye?
A: Delta is often used for high-current applications, Wye for systems needing a neutral. Motors may use either depending on voltage requirements.

Q3: Does this calculation consider power factor?
A: No, this is the magnitude of current. For complex power calculations, power factor must be considered separately.

Q4: How do I measure line current?
A: Use a clamp meter on any one of the three line conductors in a three-phase system.

Q5: What about phase-to-phase vs phase-to-neutral?
A: In Wye systems, phase current equals line current for phase-to-neutral. For phase-to-phase, multiply by √3.