zonal scheme of electric supply network for institutions of the academy of sciences of moldova

Analysis of regime of operation of existing electricity network of academic institutions in the district of Television Center of Chisinau was performed. Calculations were performed on the base of actual power consumption. Losses of electricity in all parts of the network have been estimated as well. It has been demonstrated that due to the low power consumption, transformers of the system have been loaded less than 20%. As a result, losses in the steel (idling losses) of transformers dominate over value of losses of all networks (about 95%). Basic cause of increased losses was aging of the equipment. The losses in iron of transformers could be much greater than the certified value of the losses in transformers with a long life (20-30 years). Three efficient network configurations have been proposed. Power losses have been calculated for each topology of network. Advantages of the zonal scheme, as one of the most efficient power supply network, have been demonstrated.