The energy market's liberalization has contributed to an increase of responsibility on the transmission and distribution system operators to achieve the standards established by the respective regulatory entities in order to guarantee the highest quality of supply to the consumers. This paper describes the evolution of the Portuguese National Electricity Transmission Grid (RNT), the results achieved in the last years, the grid's reability and availability, and also some necessary measures taken in a perspective of quality of supply improvement.
Abstract. REN -Rede Eléctrica Nacional S.A., as the concessionaire of the Portuguese National Electricity Transmission Grid (RNT), has an important role in electrical energy quality to the final customer. Continuity of supply general/individual indicators and parameters are defined in accordance to the regulatory legislation stated in the Portuguese Quality of Service Regulation (RQS). Voltage quality assessment is done by REN and is based on a monitoring plan that includes voltage characteristics measurement at selected delivery and internal points.A study was conducted in order to characterize all the bus bars that were monitored between 2010 and 2011. It was used a simple methodology based on labeling the power quality. On this paper, it will be shown this methodology and the results obtained in characterizing the delivery points of the Portuguese Electricity Transmission Grid (RNT) for the period 2010-2011, as well as other REN quality of supply results in the last years.
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