Harmonic Analysis Calculator
Calculate THD and check IEEE 519 harmonic compliance.
IEEE 519-2022 Current Distortion Limits
Maximum harmonic current distortion at PCC (Point of Common Coupling)
| Isc/IL | 3-10 | 11-16 | 17-22 | 23-34 | 35+ | TDD |
|---|---|---|---|---|---|---|
| <20 | 4.0% | 2.0% | 1.5% | 0.6% | 0.3% | 5.0% |
| 20-50 | 7.0% | 3.5% | 2.5% | 1.0% | 0.5% | 8.0% |
| 50-100 | 10.0% | 4.5% | 4.0% | 1.5% | 0.7% | 12.0% |
| 100-1000 | 12.0% | 5.5% | 5.0% | 2.0% | 1.0% | 15.0% |
| >1000 | 15.0% | 7.0% | 6.0% | 2.5% | 1.4% | 20.0% |