Third-harmonic neutral current
Estimate neutral current from identical, coherent third harmonics on three balanced phases.
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Method and assumptions
- I3 = I1 × third harmonic % / 100; IN3 = 3 × I3; phase RMS = √(I1² + I3²).
Before using the result
- Balanced fundamentals and identical coherent third harmonics only. Other triplen harmonics, imbalance and frequency-dependent losses are excluded.
- This does not select neutral conductor size. Use measured spectra and the applicable cable method.
Worked example
Illustrative default inputs. Enter your project values above.
- Fundamental current per phase
- 100 A
- Third harmonic relative to fundamental
- 40 %
Default results
- Third harmonic per phase
- 40 A
- Third-harmonic neutral current
- 120 A
- Phase RMS in this model
- 107.7 A
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Technical references
These references support planning. The exact model documentation and a project-specific engineering review govern the final specification.