Voltage sag coordination for reliable plant operation

This paper offers techniques to coordinate sensitive electric equipment with predicted or measured voltage sag characteristics. The techniques for predicting voltage sag characteristics have already been developed and proposed for Chapter 9 of the Gold Book. This paper describes the coordination techniques and another section that are planned for inclusion in Chapter 9. The techniques provide a display of sag characteristics and equipment sensitivity on a simple graphical display. This greatly simplifies the coordination of sensitive equipment with sag characteristics on the electric supply mains. The paper also covers a discussion of sag reporting options that is planned for Chapter 9 and some suggestions on future extensions for this coordination technique.