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Protection strategies for transmission and distribution systems have beenextensively investigated to facilitate better coordination of physicalprotection devices. A diverse range of functional motors with dedicatedprotection schemes are being used more and more in commercial, residential, andindustrial buildings. This paper focuses on simulating several of the mostpopular protection schemes using the ElectroMagnetic Transient Program (EMTP)model for three-phase and single-phase induction motors in existing commercialbuildings connected to typical distribution feeders. To investigate thebehaviors of single-phase motors stalling, the actions of motor protection andreconnections, and the impacts of device-level protection on system-leveldynamics, we imposed voltage depressions at the head of a feeder fully loadedwith functional induction motors. Several distribution feeders are representedin a standard IEEE 39-bus transmission system to simulate fault-induced delayedvoltage recovery (FIDVR) and explore mitigation strategies by optimallyconfiguring the building-level motor protection settings.

Impact of Building-Level Motor Protection on Power System Transient Behaviors