Methods for electrical power losses evaluation in electricity distribution networks

This paper presents two methods for power losses evaluation in electricity distribution systems (substations and feeders). The methods use only two, usually accessible, data: resistance R of particular network´s element, and the annual electrical energy flow W, passed through it. The paper presents results of the research which aim was to find dependance of thermic impulse, A=Σi²(t)·Δt, on annual electrical energy flow, W: A=ƒ(W).