B44066D Series Anti-Resonance Harmonic Filter for PFC System from TDK

Chipdip: TDK B44066D

In power factor correction systems, in addition to direct power factor correction capacitors and special switching devices, an additional component can also be used that improves the operation of the system - an antiresonant harmonic filter. The anti-resonance harmonic filter is an inductive frequency filter (choke) that is installed between the contactor or starter and the power factor correction capacitor.

Connecting a power factor correction capacitor together with the power transformer of the final device forms a resonant circuit. In practice, the resonant frequency of such a circuit is usually 250-700 Hz, it is in the range of the 5th-7th harmonics of the mains voltage. Resonance can lead to the following undesirable effects: overvoltage on the capacitor; overvoltage on the transformer and distribution networks; interference with measuring and control equipment; resonant amplification of harmonics; distortion of the supply voltage.

Resonance effects can be avoided by connecting a special filtering inductance (choke) in series with the capacitor. Detuned systems are tuned so that their natural resonant frequency lies below the lowest harmonic of the mains voltage. In this case, at frequencies above the resonant frequency, the detuned filter serves as a purely inductive load for the harmonics. At a mains frequency of 50 Hz, the detuned filter is a purely capacitive load and allows you to correct the power factor.

For use in conjunction with its own power correction capacitors, TDK produces a series of chokes - anti-resonance harmonic filters of the B44066D series.

Appearance of B44066D Series Anti-Resonance Harmonic Filters (by Chipdip)

Anti-resonant harmonic filters B44066D are available for various rated voltages 400, 440, 480V; for frequencies 50 or 60 Hz; power from 5 to 100 kvar; and normalized detuning 5.67%, 7%, 14% (determines the resonance frequency of the detuned system) for various power factor correction capacitances. Harmonic filters, in addition to power, also differ from each other in terms of inductance and effective current Irms (for given harmonic coefficients up to the 13th harmonic, inclusive, in accordance with DIN ENV VV61000-2-2).  

Common Features of B44066D Series Anti-Resonance Harmonic Filters (by Chipdip)

*Operation with high harmonic content in the load.

*Very small loss.

*High linearity.

*Small noises.

*Ease of installation.

*Long service life.

*Thermal protection (normally closed contact).