Assessment of Voltage Sags Vulnerability Area According to Magnitude and Standardized Indexes

This paper presents an assessment of voltage sags vulnerability area according to magnitude and standardized indexes. Traditionally, the vulnerability area is evaluated only through voltage sags magnitude. However, the impact of a voltage sag is also dependent of the duration and in this work it was also taken into an account. The combination of voltage sags magnitude and duration was based on IEEE 1564 through severity index and on Brazilian distribution procedures by susceptibility classes. In order to carry out the survey, data from voltage sags monitoring in an industrial consumer over 17 months and electrical faults historical of the transmission network to which this industry is inserted were utilized in this research. Results showed that only the severity index incorporated magnitude and duration in the same vulnerability area.