Passive filters are built with a series of passive components, such as resistors, inductors, and capacitors. They are the most common type of harmonic filter, and are available for all voltage levels.Typically, passive filters are built-up by combinations of capacitors, inductors (reactors), and resistors.
Active filters are available mainly for low-voltage networks. They are very fast electronic devices that insert negative harmonics into the network, thus eliminating undesirable harmonics. Active filters are built with active components such as insulated gate bipolar transistors (IGBT). They can eliminate many harmonic frequencies.
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Three-phase AC is a type of alternating current (AC) with three separate outputs from a single source, with a phase difference of 120 electrical degrees between any two adjacent voltages or currents.
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A signal's total harmonic current distortion (THID) is the ratio of the sum of the powers of all harmonic frequencies above the fundamental frequency to the power of the fundamental frequency.
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Reactive power is the mathematical product of voltage and current consumed by reactive loads. Examples of reactive loads include capacitors and inductors. These loads, when connected to an AC voltage source, draw current. However, because this current is 90o out-of-phase with the applied voltage, reactive loads consume no real-power in the ideal sense.
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IEEE 519 is a standard from the Institute of Electrical and Electronics Engineers (IEEE) that is designed to help utilities and end-users deal with the growing issue of harmonic voltages and currents. IEEE 519 imposes harmonic distortion limits on new electrical equipment that are added to a system. The IEEE 519 standards are applicable in the United States.
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The UL Mark indicates that Underwriters Laboratories Inc. (UL) has found that samples of the product meet that organization's safety requirements. These requirements are based primarily on UL's published Standards for Safety.
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This is the full required range of ambient operating temperature.
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Type 1 NEMA enclosures are designed for indoor use. They protect personnel against incidental contact with the enclosed equipment and protect the enclosed equipment from falling dirt.
Type 2 NEMA enclosures are designed for indoor use. They protect personnel against incidental contact with the enclosed equipment and protect the enclosed equipment from falling dirt and the dripping and light splashing of liquids.
Type 3 NEMA enclosures are designed for indoor or outdoor use. They protect personnel against incidental contact with the enclosed equipment and protect the enclosed equipment from falling dirt, rain, sleet, snow, and windblown dust. Type 3 NEMA enclosures are undamaged by the external formation of ice on enclosure.
Type 3R NEMA enclosures are designed for indoor or outdoor use. They protect personnel against incidental contact with the enclosed equipment and protect the enclosed equipment from falling dirt, rain, sleet, and snow. These enclosures are undamaged by the external formation of ice.
Type 12 NEMA enclosures have knockouts and are designed for indoor use. They protect personnel against incidental contact with the enclosed equipment and protect the enclosed equipment from falling dirt; circulating dust, lint, fibers, and flyings; and the dripping and light splashing of liquids.
Devices mount in racks and come with hardware such as rail guides, flanges, or tabs. Some rack-mounted devices fit in a standard 19” telecommunications rack.
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