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Technical and electric installations, equipment and apparatus for power engineering, light-current electrical engineering, high-voltage technology and extremely-high-voltage technology; Current transformers; Rectifiers; Inverters [electricity]; Inverter units; Direct Current-to-Direct Current converters; Energy accumulators; Measuring sets; Control equipment; Supervisory control equipment; Installations, equipment and computer software for conducting, distributing, switching, transforming, accumulating, influencing or controlling electricity; Installations, equipment and computer software for influencing, activating, controlling, monitoring and testing drive units, motors and engines, wind power plants, wind farms, generators, technical, chemical and electric installations, equipment and apparatus, power supply systems, power grids, solar modules, photovoltaic installations, transformers, converters; Installations, equipment and computer software for influencing, activating, controlling, monitoring and testing electric installations, equipment and apparatus for high-voltage direct current transmission, converter stations, three-phase current switching stations, DC current switching stations, coils, capacitors, accumulators, apparatus for commutation, step switches, sensors, measuring equipment, control equipment, monitoring equipment; Installations, equipment and computer software for guaranteeing and improving the voltage quality of public, private and industrial power supply systems and power grids; Installations, equipment and computer software for power factor correction using coils and capacitors and for uninterruptible power supply; Electric/electronic filters, Passive and active filters, Network filters, Harmonic filters, Power factor correction filters