Compute THD at each bus and compare with IEEE 519 limits.
Unbalanced Analysis (per-phase spectra)
Enter independent harmonic spectra for each phase using order:pct notation (e.g. 3:30,5:14). Leave a field blank to inherit the balanced spectrum from the one-line component.
Component ID
Phase A spectrum
Phase B spectrum
Phase C spectrum
No harmonic source components found. Add components with Harmonic Source enabled in the one-line editor.
⚠ Neutral conductor overload detected — neutral current exceeds 100 % of phase FLA on one or more components. Upsize neutral conductor or add triplen harmonic filters.
⚠ Phase imbalance detected — per-phase ITHD varies by more than 10 percentage points on one or more components.
Component
ITHD-A (%)
ITHD-B (%)
ITHD-C (%)
VTHD worst (%)
IEEE 519 limit (%)
Neutral I (% phase)
Neutral dominant order
Status
Frequency Scan (harmonic resonance)
Sweep system impedance Z(h) vs. harmonic order to identify parallel resonance peaks.
A peak near an integer harmonic order means that harmonic current is amplified — a
common hazard when adding capacitor banks for power factor correction.
Capacitor / Filter Banks
#
MVAR
kV
Tune Order (0 = untuned)
Q Factor
⚠ Dangerous resonance detected — parallel resonance coincides with a harmonic injection order.
Amplified currents may violate IEEE 519 limits. See recommendations below.