The behavior of power distribution feeder dips

This paper presents interesting results from a dip study that included events related to five distribution feeders with poor dip performance and one substation, which was supplying one of the feeders. Data stored in a SQL database was available for analysis and post treatment, with the following outcome: • Statistics on recorded dips (type I, II and III) and short interruptions over one year period; • Weather influence on dip behavior and statistics on dip occurred during stormy days and normal weather days; • Sizing of SCADA system using dip and outage statistics • Percentage of dips originating in transmission system among the dips recorded at substation and LV sites; • Dip propagation from substation bus bars to the end of the feeder.