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This paper presents a distributed power quality monitoring system that allows analyzing all steady and non-steady state phenomena related to power quality. The system is flexible and open to changes and improvements. The monitoring system is presented with reference to its distributed architecture, describing the several remote measurement substations that are based both on commercial and advanced high performance devices. On-field measurements conducted on low voltage sub-networks are reported for some of the main power quality phenomena. Statistical analysis results are reported to highlight the system performances with the different occurrence frequency of disturbances.