Harmonic Filter Calculator — Formule

## Single-Tuned Harmonic Filter Design

A series LC filter tuned to a specific harmonic frequency provides a low-impedance path that diverts harmonic current away from the system.

### Design Steps

1. **Capacitive reactance at fundamental**: Xc = V^2 / kVAR
2. **Inductive reactance at fundamental**: Xl = Xc / n^2
3. **Capacitance**: C = 1 / (omega x Xc)
4. **Inductance**: L = Xl / omega

Where n is the harmonic order and omega = 2 x pi x f_fundamental.

Filters are typically tuned slightly below the target harmonic (e.g., 4.7th instead of 5th) to avoid resonance with system impedance.