Active Harmonic Filters improve power quality.

Press Release Summary:

Comprised of scalable, 3- and 4-wire active harmonic filter modules/systems, Power Balance & Kxxx Series meet IEEE-519 and Mil-Std-1399 with respective values of 5% TDD and <3% THDi. Communication connections include Ethernet TCP/IP, Ethercat, and ModBus, and functions include resonance frequency detection and automatic protection; trace waveform display/capture (filter current, load current, grid current, and voltage); and NEMA-rated, air and liquid cooling options.

Original Press Release:

New Series of Active Harmonic Filters and Advanced Display/Measurement Functionally (Resonance Frequency Detection and Automatic Protection)

Hopkinton, MA – Schaefer Inc. is proud to introduce a new series of Active Harmonic Filters and Advanced Display & Measurements Functionally. Three-wire and four-wire Active Harmonic Filter modules/systems that are designed to meet IEEE-519 (5% TDD) and Mil-Std-1399 (<3% THDi). The Power Balance & Kxxx Series family are scalable and offer a cost-effective solution for improving power quality for wide range of Heavy Industrial and Military applications.

Communication connections via Ethernet TCP/IP, Ethercat system and ModBus. New advanced functions include resonance frequency detection and automatic protection, trace waveform display/capture (filter current, load current, grid current & voltage), new series of high IP/NEMA rated air and liquid cooled active harmonic filters (modules & systems).

Product highlights:

Reducing harmonics (TDD reduction to 5% / <3% THDi Mil-Std-1399)

Individual harmonic compensation adjustment

Rebuilding distorted three phase currents/voltages

Four wire zero sequence current compensation.

Power Factor (phase displacement) correction/adjustment

Balancing 3 phase currents

60A to 1000s Amps of compensation current

Schaefer can design and manufacture fully custom solutions. Full product specifications can be viewed at For further information and pricing, please contact Jeff Roffee (Director of Power Systems) Schaefer, Inc., 45 South Street, Hopkinton, MA 01748.

Tel: 508/435-6400 Fax: 508/435-6401 for additional information or to schedule a demo.

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