Losses in power supply system of industrial consumers — A technical and economic issue

Abstract

Nowadays, the role and functionality of power supply system of the consumer (PSC) increases. As interface between the power distribution system and consumer power system, PSC has a strong influence on quality and efficiency of energy and implicitly on the level of energy costs. Besides specific measures for increasing efficiency and reduction of energy costs, the industrial consumer is interested both, in economic and in technical evaluation of power transformer included in PSC, and in its impact on the total energy cost. The paper deals with the methodology of electric energy billing for the case of Romanian industrial consumers. A procedure is proposed for the evaluation of the cost of consumer energy, putting in evidence the losses in PSC when the measurement point is on LV. The loading factor of PSC transformer is determined and the efficiency of PSC transformer replacement is obtained. The application of this procedure is done for a PSC of 100 kVA which supplies an industrial consumer. This procedure can be the basis for development of a system for power control and monitoring with the aim to minimize electricity demand costs.