A new approach for a correct estimation of power and energy losses in urban distribution networks is described in the paper. The method is based on a row of national directives for power and energy loss analysis as well as on author's investigation. The method allows the calculation of load-dependent (current-dependent) and load-independent (voltage-dependent) power and energy losses in an urban network and their separation between power nets of different voltage levels. On the base of the elaborated method it is possible to analyse and to predict the power loss profiles over time (for instance annual profiles) depending on the power delivered to the urban distribution network under study.
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