The In-Op design of electrical distribution systems based on microsystem criteria

Innovative criteria and approaches can assist the designing of electric power systems in pursuing aims on operational performances, safety, reliability, energy and costs saving. The paper deals with an innovative design strategy of building power systems by introducing criteria based on both the "installation approach" and the "operating approach". It promotes an In-Op design of the electrical power systems that take care not only the gap on load in selecting the rating of components but also their gap on lifetime with an actual life loss lower than the time from installation. In reference to IEC standards, the paper underlines parameters as guideline in the design of the circuit distribution. Cable steady current and transient current densities, load current torque density, mean losses in an operating time are introduced to support the selection and sizing of the cross sectional area of circuit conductors and the understanding of their behavior. Microsystem criteria in power system design consists of structuring their configuration with components of smaller size, in assembling suitably the supplying loads, in adopting circuit with conductors/cables with higher value of current densities, and reduced volume for an assigned gap on lifetime with more sensitive results in the branch distribution. Key words: Electrical Installations, Ecodesign