Capacitor-bank resonance screen
Estimate resonance order for a plain capacitor bank and source impedance.
Enable JavaScript for live calculations. Read the method and default example below.
Method and assumptions
- h0 = √(source short-circuit kVA / capacitor bank kvar); f0 = fundamental Hz × h0.
Before using the result
- Lumped source inductance and a plain bank only; detuned reactors and filters are not represented.
- This is not a safe/unsafe threshold or a reactor selection. Review measured harmonics, source configurations and capacitor switching states.
Worked example
Illustrative default inputs. Enter your project values above.
- Bus short-circuit power
- 10000 kVA
- Plain capacitor bank
- 350 kvar
- Fundamental frequency
- 50 Hz
Default results
- Approximate resonance order
- 5.345
- Approximate resonance frequency
- 267.26 Hz
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Technical references
These references support planning. The exact model documentation and a project-specific engineering review govern the final specification.