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PROTECTION OF CAPACITORS WITH ANTI-HARMONIC REACTORS

For supplies with a high level of harmonic interference, installing an anti-harmonic reactors connected in series with the capacitor proves to be the only effective solution.

The anti-harmonic reactors has two purposes: 

• to increase the impedance of the capacitor against harmonic currents

• to shift the parallel resonance frequency (Fr.p.) of the source and the capacitor to below the main frequencies of the interfering harmonic currents.

* Fr.p.: Anti-harmonic reactors/capacitor/MV/LV transformer parallel resonance frequency
* Fr.s.: Anti-harmonic reactors/capacitor serial resonance frequency, (most common values used 190 - 210 and 225 Hz. Other typical values 205 Hz and 215 Hz).

* for frequencies below Fr.s., the reactors/capacitor system behaves like a capacitance and compensates for the reactive energy.
* for frequencies above Fr.s., the reactors/capacitor system behaves like an inductance which, in parallel with the inductance XLT, cancels any risk of parallel resonance at frequencies above Fr.s., particularly at the main harmonic
frequencies.

Sommaire Harmoniques