Optimized dielectric design of stator windings from medium voltage induction machines fed by fast front pulses

AC induction machines are exposed to fast-front pulses when fed from frequency converters. This type of excitation produces additional dielectric stress in the machine's insulation system which can result in premature deterioration or even failure. In this work, a non-uniform transmission line...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2017-04, Vol.24 (2), p.837-846
Main Authors: Hussain, Mohammed Khalil, Gomez, Pablo
Format: Article
Language:English
Subjects:
Coils (windings)
Converters
Design modifications
Design optimization
dielectric stress
Dielectrics
Electric potential
Electrical equipment
Excitation
Finite element analysis
finite element method
Frequency converters
Induction machines
Induction motors
Insulation
Medium voltage
Optimization
Repair & maintenance
Stator windings
Stresses
Winding
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Summary:AC induction machines are exposed to fast-front pulses when fed from frequency converters. This type of excitation produces additional dielectric stress in the machine's insulation system which can result in premature deterioration or even failure. In this work, a non-uniform transmission line modeling approach is used in combination with FEM-based parameter computation to predict the transient voltage distribution in a machine winding under fast-front pulse excitation. Using this voltage distribution as input, different optimization algorithms are applied to identify and evaluate modifications to the winding design aimed at minimizing the dielectric stress. Test cases considering two different geometrical configurations show that the optimized designs considerably reduce the dielectric stress in the machine coils.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2017.006249