Power Quality metering instrument is presented,
that features high flexibility and communication capabilities and
is suitable for a hierarchical network connection. Once deployed,
the complete control through the network and long mission time
when on the local battery make it suitable for unsupervised
applications at electric transportation systems, industrial plants,
power generation sites. The main characteristics are reported
both for the single PQ metering unit and for the network
capability, together with the requirements that drove the design