kVAR to Amps Calculator
Convert reactive power in kVAR to electrical current in Amps. Switch between kVAR to Amps and Amps to kVAR conversions instantly.
kVAR to Amps Converter
How to Use the kVAR to Amps Converter
Converting reactive power (kVAR) into electrical current (Amps) is simple. Follow these steps:
- 1Select Phase Type: Choose between Single Phase or Three Phase configuration.
- 2Enter Reactive Power (kVAR): Input your system's reactive power rating.
- 3Enter Voltage: Input the operational AC line voltage in volts.
- 4Click Calculate: Press the 'Calculate to Amps' button to run the formulas.
How to Calculate kVAR to Amps (Step-by-Step Guide)
Converting kVAR (kilovolt-amperes reactive) to electrical current (Amps) helps size distribution wires and circuit breakers for capacitor correction systems. The formulas and mathematical workflow are presented below.
kVAR to Amps Formulas
For Single-Phase AC:
For Balanced Three-Phase AC:
Where:
- I: Current in Amperes (A)
- kVAR: Reactive power rating
- V: Operating line voltage in volts (V)
Real-Life Scenario: Sizing Fuses for a Three-Phase Capacitor Bank (50 kVAR)
An industrial plant manager installs a 50 kVAR three-phase capacitor bank on a 400V electrical loop. Sizing the feeder loop protection requires calculating the nominal current:
- 1Apply Three-Phase Equation:
I = (50 × 1,000) ÷ (1.732 × 400) - 2Calculate Denominator:
Denominator = 1.732 × 400 = 692.8 - 3Divide Numerator by Denominator:
I = 50,000 ÷ 692.8 ≈ 72.17 Amps
Final Output: The current is approximately 72.17 A.
kVAR to Amps Reference Conversion Chart
The table below displays current ratings (Amps) across standard kVAR values for Single-Phase (230V) and Three-Phase (400V) systems:
| Reactive Power (kVAR) | Single-Phase (230V) | Three-Phase (400V) |
|---|---|---|
| 5 kVAR | 21.74 A | 7.22 A |
| 10 kVAR | 43.48 A | 14.43 A |
| 20 kVAR | 86.96 A | 28.87 A |
| 50 kVAR | 217.39 A | 72.17 A |
| 100 kVAR | 434.78 A | 144.34 A |
| 300 kVAR | 1,304.35 A | 433.01 A |
10 kVAR to Amps
A rating of 10 kVAR to Amps operated at a standard three-phase line voltage of 400V draws a nominal current computed as:
I = (10 × 1,000) ÷ (1.732 × 400) ≈ 14.43 Amps.
This value guides commercial wire sizing.
50 kVAR to Amps
Sizing the protective fuses for a 50 kVAR to Amps three-phase capacitor bank loop on a 480V line is calculated as:
I = (50 × 1,000) ÷ (1.732 × 480) ≈ 60.14 Amps.
100 kVAR to Amps
A substation handling 100 kVAR to Amps at a standard 400V three-phase configuration draws:
I = (100 × 1,000) ÷ (1.732 × 400) ≈ 144.34 Amps.
20 kVAR to Amps
Calculating the current draw of a 20 kVAR to Amps capacitor loop operated at 230V single-phase shows:
I = (20 × 1,000) ÷ 230 ≈ 86.96 Amps.
300 kVAR to Amps
A heavy industrial correction system drawing 300 kVAR to Amps on a 415V three-phase line requires:
I = (300 × 1,000) ÷ (1.732 × 415) ≈ 417.36 Amps.
Frequently Asked Questions (FAQs)
To convert kVAR to Amps, multiply kVAR by 1,000 and divide the result by the system voltage. For three-phase systems, also divide by the square root of 3 (1.732) in the denominator.
At 400V three-phase, 1 kVAR is equal to approximately 1.44 Amps. At 230V single-phase, 1 kVAR is equal to approximately 4.35 Amps.
Current is calculated by dividing the reactive power in Volt-Amperes Reactive by the voltage: I = (kVAR × 1,000) ÷ (Phase Multiplier × V).
For a standard three-phase 415V loop, a 25 kVAR capacitor draws: I = 25,000 ÷ (1.732 × 415) ≈ 34.78 Amps.
25 kVAR represents 25,000 Volt-Amperes Reactive of imaginary power. It is a standard power factor correction step rating for commercial facilities.
50 kVAR represents 50,000 Volt-Amperes Reactive. It characterizes the reactive power compensation capacity of a centralized automatic power factor correction panel.
kVAR (kilovolt-amperes reactive) represents reactive power in AC grids. It does not perform active work but is necessary to sustain magnetic fields in motors and transformers.
At 400V, 50Hz, a 20 kVAR capacitor size corresponds to a capacitance of approximately 398 µF.
Reactive power is calculated using voltage, current, and the sine of the phase angle: kVAR = (V × I × sin(θ)) ÷ 1,000.