Calculation of Transient Torques on Motors During a Residual Voltage Motor Bus Transfer

To maintain a critical process upon loss of primary motor bus power, the petrochemical industry depends largely on residual voltage transfer, ignoring phase angle and closing the backup source when the motor bus residual voltage has decayed to 30%. To assess the consequences of out-of-phase residual...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2020-11, Vol.56 (6), p.6104-6116
Main Authors: Yalla, Murty V.V.S., Vakili, Arman, Beckwith, Thomas R.
Format: Article
Language:English
Subjects:
Electric potential
Fast transfer
in-phase transfer
Induction generators
Induction motors
Load modeling
main-tie-main
motor bus transfer (MBT)
Motors
Phase shift
residual voltage transfer
Rotors
Synchronous motors
Torque
Transient analysis
Transient current
Voltage
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Summary:To maintain a critical process upon loss of primary motor bus power, the petrochemical industry depends largely on residual voltage transfer, ignoring phase angle and closing the backup source when the motor bus residual voltage has decayed to 30%. To assess the consequences of out-of-phase residual voltage transfers, a transient simulation program models a bus with three motors of various sizes, inertias, and impedances. The three motors are loaded around 80% with fan, pump, and compressor loads to calculate the peak transient motor current and torque upon closure of the backup source breaker. Pre-transfer events and conditions produce an initial phase angle between the primary and backup sources, and the simulation reproduces the resultant residual voltage transfer closing angle and its effect on the peak transient current and torque. Individual motors exhibit positive and negative torques, oscillating from induction generator to motor, and the peak-to-peak torques are also recorded, as they can impact the motor shaft stress.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2020.3015822