AC filters absorb the harmonic currents that are generated during AC-DC conversion by combining power capacitors with reactors. They are used for a wide range of voltage and are designed for high voltage (3.3 kV class) to ultra-high voltage (500 kV). They are applicable to various types of equipment including inverter equipment, DC transmission converter stations, and frequency converter stations.


We started to deliver extra-high voltage (66 kV/77 kV) AC filters in the 1960s, and have a track record in and outside Japan. We make proposals based on two technologies: hardware technology including ultra-high voltage large-capacity power capacitors and software technology derived from the experience of analyzing unusual events based on power system analysis. We offer optimal equipment as the top manufacturer of AC filters.


We offer only build-to-order products for respective projects.

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