Considerations in maintaining process continuity during voltage dips while protecting motors

Abstract

The problem of transients and criteria for safe reclosing or transfer of several motors on the same bus are presented. References are given for modeling induction and synchronous motors, and also for determining the currents and torques due to out-of-phase reclosing. Various protective schemes against out-of-phase reclosing and transfer as well as methods of riding through voltage dips are discussed. Application of a particular method depends on the individual characteristics of each electrical system and the process that it serves.<>