Amp Calculator 3 Phase

Three Phase Current Formula:

\[ I = \frac{P}{V \times \sqrt{3} \times PF} \]

Current (I):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Three Phase Current Formula?

The three phase current formula calculates the current (in amps) in a three phase electrical system based on power (in watts), voltage (in volts), and power factor. It provides an accurate assessment of electrical current flow in three phase systems.

2. How Does the Calculator Work?

The calculator uses the three phase current formula:

\[ I = \frac{P}{V \times \sqrt{3} \times PF} \]

Where:

\( I \) — Current in amps
\( P \) — Power in watts
\( V \) — Voltage in volts
\( PF \) — Power factor (dimensionless, 0 to 1)
\( \sqrt{3} \) — Approximately 1.732 (dimensionless)

Explanation: The equation accounts for the relationship between power, voltage, and current in three phase systems, with the power factor representing the phase difference between voltage and current.

3. Importance of Current Calculation

Details: Accurate current calculation is crucial for electrical system design, circuit protection, equipment sizing, and ensuring safe operation of three phase electrical systems.

4. Using the Calculator

Tips: Enter power in watts, voltage in volts, and power factor (between 0 and 1). All values must be valid (power > 0, voltage > 0, 0 < PF ≤ 1).

5. Frequently Asked Questions (FAQ)

Q1: What is power factor and why is it important?
A: Power factor represents the efficiency of power usage in an AC circuit. A lower power factor means more current is required to deliver the same amount of power.

Q2: What are typical power factor values?
A: Power factor typically ranges from 0 to 1. Industrial loads often have power factors between 0.7-0.9, while resistive loads have power factors close to 1.

Q3: When should this formula be used?
A: This formula is specifically for balanced three phase AC systems. It should not be used for single phase or DC systems.

Q4: What is the significance of √3 in the formula?
A: The √3 factor accounts for the phase relationship between the three phases in a balanced three phase system.

Q5: Can this calculator be used for motor current calculations?
A: Yes, this formula is commonly used for calculating full load current of three phase motors, using the motor's rated power, voltage, and power factor.