Analysis of Voltage Dips for Event Identification
This paper focuses on a large class of power system events: those where their main characteristic is a temporary decrease in the fundamental frequency voltage (voltage dip) in one or more phases. Voltage dips have attracted a lot of attention due to the problems that they cause to equipment like adjustable speed drives, computers, industrial control systems etc. They are mainly caused by faults and induction motor starting. For the analysis of the different types of voltage dips, recordings are used that were performed at medium and low voltage networks in Sweden (by Goteborg Energi Nat AB-GENAB), Norway (by SINTEF Energy Research) and Scotland (by Scottish Power). Finally, a large set of recordings is classified, explained and presented in terms of the above mentioned types. (4 pages)