Passive filters consist of passive components (capacitors, reactors …) that create a low impedence path. ABB active filters (AHFs) use active components (semiconductors) to filter the load harmonics. An active filter injects harmonic into the network which are the same in magnitude but opposite in phase (180 deg out of phase) of the load harmonics thereby cancelling them. It results in a clean line current. For LV networks that have typically dynamic load patterns, ABB active filters are a better choice as they adapt to the load automatically and can grow with the installation.
High Voltage Products
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