Three-phase current imbalance calculator
Compare three RMS line currents using maximum deviation from their average.
Every result has a reason.
Enter your values and calculate to see the result, formula and working here.
Imbalance = maximum |I − average I| ÷ average I × 100Descriptive comparison of three non-negative RMS current magnitudes measured on the same operating basis. Uses maximum deviation from the arithmetic mean; this is not a sequence-component measure. Does not calculate neutral current, phase angles, voltage unbalance, load reassignment or compliance.
What the numbers mean.
This explicitly defined statistic describes the spread of the three entered currents. Equal currents give 0%. If all three currents are zero, the percentage is undefined. Current magnitudes alone cannot determine the neutral current.
A worked example
10 A, 20 A and 30 A have a mean of 20 A. The maximum deviation is 10 A, giving 50% by this definition.
Validation, precision and limitations