Resumo:
This work introduces a validation of voltage sag simulation tools based on
measurements obtained from the power system of a regional Brazilian utility.
The measurements were extracted during 6 months using a Power Quality Monitoring
System. The monitoring system consisted of 12 monitors conveniently distributed along the
network and a server to collect all the measurements. Those monitors were synchronized
using the GPS.
The measurements were compared with simulations using a conventional short-circuit
program (ANAFAS) and an electromagnetic transient program (ATP).
The analysis was carried out in two forms. The first was based on the comparison of
voltage sag magnitudes. The second was based on the comparison of individual and global
indexes. The influence of random variables, such as: pre-fault voltage, fault location and fault
impedance, was also investigated.
