An approach to the non-active power concept in terms of the Poynting-Park vector

This paper reconsiders the approach to the electric systems in terms of Max well equations, and reconsiders in particular the energy transfer involved in an electric system in terms of the flux of the Poynting vector. This app roach is extended to the three-phase systems, and the Park transformation i s reconsidered by applying it to the Poynting vector. In this way a correct physical meaning can be assigned to the non-active components of the Park instantaneous power by tracing them back to the components of the Poynting vector.