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Harmonic Filters

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About Harmonic Filters

Harmonic filters or line/load reactors isolate harmonic current to protect electrical equipment from damage due to harmonic voltage distortion. They can also be used to improve power factor, and are sometimes called line reactors, load reactors, line load reactors, and line/load reactors. Harmonic filters mitigate the detrimental effects of harmonic distortion, which can be manifested in many different ways. Examples include increased heating effect on electrical distribution equipment and cables, electronics miss-timings (computers, fax machines, etc.), capacitor overloads, fluorescent light flickering, and others.

Filter type and signal type are important specifications to consider when searching for harmonic filters or line/load reactors. There are two choices for filter type: passive and active. Passive harmonic filters are built with a series of passive components such as resistors, inductors and capacitors. These devices are the most common type of harmonic filters, and are available for all voltage levels. Active harmonic filters are used mainly in low-voltage networks. These line/load reactors are very fast electronic devices that insert negative harmonics in order to eliminate undesirable harmonics from a network. Active harmonic filters are built with active components such as insulated gate bipolar transistors (IGBT) and can eliminate many harmonic frequencies. Choices for signal type are single-phase AC, three-phase AC, and DC. 

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Engineering Web: Harmonic Filters

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Power factor correction with Harmonic Filters Modern electrical equipment demands Power Quality Modern electrical equipment imposes stringent demands
MTE Corporation - The International Power Quality Resource
Matrix Harmonic Filters Harmonics from Power Electronics
See MTE Corporation Profile & Catalog
Schaffner - The international leader in the field of...
Schaffner is uniquely able to offer both passive harmonic filters and active harmonic filters for the efficient mitigation of mains harmonics,
See Schaffner EMC Inc. Profile & Catalog
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