Kw Ke Ampere 3 Phase

5 min read Jun 26, 2024
Kw Ke Ampere 3 Phase

KW to Ampere Conversion for 3-Phase Systems

When working with electrical systems, it's essential to understand the relationship between kilowatts (kW), amps, and volts. In a 3-phase system, converting kW to amps can be a bit more complex than in a single-phase system. In this article, we'll explore how to perform this conversion and provide some examples to illustrate the process.

Understanding the Basics

Before we dive into the conversion process, let's quickly review some essential concepts:

Kilowatts (kW)

Kilowatts represent the real power of an electrical circuit. It's the actual power consumed by a device or system.


Amps (amperes) represent the flow rate of electric charge. In other words, it's the rate at which electrons flow through a conductor.


Volts represent the potential difference or electromotive force (EMF) between two points in a circuit.

The Conversion Formula

To convert kW to amps in a 3-phase system, we need to know the voltage and power factor (PF) of the system. The formula is as follows:

3-Phase kW to Amps Conversion Formula:

I = (kW × 1000) / (√3 × V × PF)


  • I = current in amps (A)
  • kW = power in kilowatts (kW)
  • V = voltage in volts (V)
  • PF = power factor (PF)
  • √3 = the square root of 3 (approximately 1.732)

Example Conversions

Let's consider a few examples to illustrate the conversion process:

Example 1:

A 3-phase motor has a power rating of 10 kW, with a voltage of 380 V and a power factor of 0.8. What is the current in amps?

I = (10 kW × 1000) / (√3 × 380 V × 0.8) I ≈ 19.2 A

Example 2:

A 3-phase pump has a power rating of 5 kW, with a voltage of 415 V and a power factor of 0.9. What is the current in amps?

I = (5 kW × 1000) / (√3 × 415 V × 0.9) I ≈ 10.3 A

Important Notes

  • The power factor (PF) is essential in 3-phase systems, as it affects the conversion accuracy. A PF of 1 is ideal, but in reality, it's usually less than 1.
  • The voltage is the line-to-line voltage (VLL) in a 3-phase system.
  • The conversion formula assumes a balanced 3-phase system with equal currents in each phase.


Converting kW to amps in a 3-phase system requires knowledge of the voltage, power factor, and power rating. By using the correct formula and considering the system's parameters, you can accurately calculate the current in amps. Remember to always check the system's specifications and consult with an expert if you're unsure about any of the values used in the conversion process.

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