The Italian system for Power Quality (PQ) monitoring of MV distribution networks described in the previous paper 0042 of the 19th International Conference on Electricity Distribution [1] has been working for almost 3 years on 600 instruments distributed all over the Italian territory. The paper illustrates the results of monitoring over the last three years and shows how the monitoring of events, (especially voltage dips) is going to consolidate the characterization of the Italian MV network from the PQ point of view.

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The presence of the new liberalized markets has increased interest in power quality disturbances due to their economic value. Customers have more choices; then disturbances are becoming bigger issues and suppliers and customers should regulate them in the frame of power quality contracts. A single global power quality index can be very useful for characterizing the overall level of the voltage waveform quality; in particular, this index can provide global indications regarding different aspects of voltage quality and allows a strong reduction of the measurement data needed to cover all power quality disturbances. in this paper, a global power quality index (GPQI) for discrete disturbances is proposed, based on the discrete severity indicators (DSI). We present the results of a GPQI evaluation of an Italian distribution system on voltage dips, whose measured data are available on the website of the project QuEEN led by CESI Ricerca.