Electricity supply systems, namely, electrical power supplies other than electricity generators; electricity grids, namely, electrical distribution units; photovoltaic installations, including solar modules, namely, photovoltaic cells and modules and photovoltaic solar modules for production of electricity; electricity transformers, distribution transformers; current transformers, rectifiers, inverters , inverter units, namely power inverters, direct current-to-direct current electric converters, current converter stations; rotary current switch gears, namely, electric switches, direct current switch gears, namely, electric switches; condensers being capacitors, storage batteries, electrical energy diverters; stepping electric switches, on-load tap changers, namely, current rectifiers; switching equipment being switching apparatus for electricity, , electric switchboxes, electricity control panels, and electrical terminal boxes; distribution boxes for electricity, electrical tap boxes, namely, electrical terminal boxes; sensors, in particular electric, electronic, electro-optic, fibre optic, acoustic, optical, photoelectric and piezoelectric sensors for installation control and engine control; Buchholz relays, namely, electric relays; interfaces for computers, communication interface units in the nature of electronic display interfaces, apparatus for transmission of communication; installations and equipment for conducting, distributing, switching, transforming, accumulating, influencing or controlling electricity namely, electrical conductors, electrical switchers, electrical on load tap-changers, electric tap-changers, electrical power distribution units, electric accumulators, electric control panels, and resistors for distributing or controlling electric current; downloadable computer software for conducting, distributing, switching, transforming, accumulating, influencing or controlling electricity; downloadable computer software for influencing, operating, controlling, monitoring and testing drives, motors and engines, wind power installations, wind farms, generators, technical, chemical and electric installations, equipment and apparatus, electricity supply systems, mains, solar modules, photovoltaic installations, transformers and converters; computer hardware, namely installations and equipment and downloadable 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; computer hardware, namely installations and equipment and downloadable computer software for influencing, operating, controlling, monitoring and testing installations, equipment and apparatus for earthing and discharging, and faraday arrays, voltage generators, electric and electronic filters; computer hardware, namely installations, equipment and downloadable computer software for guaranteeing and improving energy quality of public, private and industrial electricity supply systems and electricity networks; computer hardware, namely installations and equipment and downloadable computer software for reactive power compensation using coils and condensers, namely capacitors, and for uninterruptible electrical power supply; sensors and measuring devices for temperature, level, flow, speed, acceleration, mechanical voltage , shaping, bending, expansion, shearing, torsion, pressure, humidity, surface vibrations, sound, vibrations, electromagnetic radiation , light and microwaves; sensors and measuring devices for electric current, electric voltage , electric energy, electric power , electric impedance , power factor, phase shift, loss factor, partial discharge, the analysis of dissolved gases and the transformation ratio of electricity transformers ; computer hardware and computer downloadable software for controlling industrial processes; oscilloscopes, electronic data loggers, arc suppression coils, namely, electric coils, electrodes; voltage generators, namely, pulse generators for testing electric current; electric/electronic filters, namely, low pass inductor filter used in high power electrical applications