Enter the phase A current (amps), the phase B current (amps), and the phase C current (amps) into the calculator to determine the Neutral Current.
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Neutral Current Formula
The following formula is used to calculate the Neutral Current magnitude for a three-phase system where the phase currents are sinusoidal and 120° apart.
In = \sqrt(A^2+B^2+C^2-A*B-A*C-B*C)
- Where In is the Neutral Current (amps)
- A is the phase A current (amps)
- B is the phase B current (amps)
- C is the phase C current (amps)
How to Calculate Neutral Current?
The following example problems outline how to calculate Neutral Current.
Example Problem #1
- First, determine the phase A current (amps). In this example, the phase A current is 10 amps.
- Next, determine the phase B current (amps). For this problem, the phase B current is 23 amps.
- Next, determine the phase C current (amps). In this case, the phase C current is 3 amps.
- Finally, calculate the Neutral Current using the formula above:
In = √(A^2+B^2+C^2-A*B-A*C-B*C)
Inserting the values from above and solving yields:
In = √(10^2+23^2+3^2-10*23-10*3-23*3) = √309 ≈ 17.5784 (amps)
Example Problem #2
Using the same method as above, determine the variables required by the formula. For this example problem, these are:
phase A current (amps) = 5
phase B current (amps) = 41
phase C current (amps) = 2
Enter these given values into the calculator above yields:
In = √(5^2+41^2+2^2-5*41-5*2-41*2) = √1413 ≈ 37.5899 (amps)
