Voltage Sag Studies in Electric Systems of Industrial Plants due to Disturbances in the Interconnected Power System

This technical paper shows a feature that can be

implemented in short circuit programs for power quality studies.

The voltage behavior in areas nearby an industrial substation is

determined for disturbances in the interconnected power system.

The studies were initiated a few years ago as a subsidy to the

analysis of voltage sags in an oil refinery in the Northeast of

Brazil. There was a need for specific features to do this type of

study using short circuit programs to make possible the

implementation of a large number of faults, however with simple

and effective ways of analyzing the results.