Chart
Power-factor capacitor harmonic resonance risk map
Map when power-factor correction capacitors, VFDs, and nonlinear loads should trigger harmonic resonance review.
Chart boundary
Does not size capacitors, calculate resonance frequency, prove utility compliance, or select filters.
resonance risk heatmap
Capacitor plus harmonics risk zones
Use the risk map to decide when plain capacitors are not the end of the power-factor conversation.
Scopepower qualityX-axisnonlinear load shareY-axiscapacitor / system strengthReviewAnnualNextPower factor correction kVAR calculator
capacitor / system strength
low
moderate
high
small kvar / stiff system
screen
review
study
larger kvar
review
study
study
weak system / high kvar
review
study
study
nonlinear load share
Decision table
Show why kVAR size alone is not enough when capacitors are added to systems with harmonic-producing loads.
Scroll sideways to keep row labels aligned with hidden columns.
| Condition | Chart reading | Next check | Boundary |
|---|---|---|---|
| Low nonlinear load share | Capacitor discussion may be straightforward | PF kVAR calculator | No capacitor selection |
| Many VFDs or rectifiers | Resonance risk should be screened | Harmonic mitigation chart | No harmonic result |
| Existing distortion issues | Do not add plain kVAR blindly | Power-quality study | No utility compliance |
| Utility penalty or demand charge | Separate PF correction from harmonics | Bill impact calculator | No tariff decision |
Notes
- Treat this chart as a planning and conversation aid only.
- Confirm current utility requirements, product markings, manufacturer instructions, and local authority requirements before field work.
- Use the linked calculator or table when the task needs project-specific arithmetic.
Source links
Open the underlying public sources before treating the chart as project guidance.