Power controllers; operating systems; power regulating apparatus; power units; power distributors (electrical); electronic power controllers; power conditioning apparatus; electric power controllers; electronic power transformers; electronic control systems; electric conductors; connections, electric; couplings, electric; electrical rectifiers; electric converters; electricity transformers; electricity inverters; electricity exchangers; impedance transformers; distribution transformers; electronic transformers; step down transformers; step up transformers; electric voltage transformers; high voltage transformers; electrical reducing transformers; capacitive voltage transformers; dry-type transformers; electric current transformers; tap changers for electric transformers; apparatus and instruments for transforming electricity; apparatus and instruments for transforming the use of electricity; apparatus and instruments for transforming the distribution of electricity; energy regulators; energy control devices; apparatus for monitoring electrical energy consumption; electric control devices for energy management; programmable controllers; invertor controllers; inverters; transformers; apparatus and instruments for electricity storage; anti-interference devices in the field of electricity; apparatus and instruments for the distribution of electricity; apparatus and instruments for the provision of electricity signal correction; apparatus and instruments for the provision of voltage regulation; apparatus and instruments for the provision of phase balancing; apparatus and instruments for the provision of electrical load balancing; apparatus and instruments for the removal of harmonics; apparatus and instruments for the regulation of an electricity grid or network; apparatus and instruments for the regulation of electrical system frequency, voltage, phase and power factor; apparatus and instruments for the optimisation of power flow by real-time signal correction