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# Transient Voltage Distribution in Stator Winding of Electrical Machine Fed from a Frequency Converter

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Bolarin Oyegoke, Sep 27, 2015 Available from: Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.

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**ABSTRACT:**The application of inverter-fed drives provides additional electrical stresses in induction motors' insulation system. This is due to steep-fronted voltage pulses responsible for high overvoltages at the motor's input terminals and to an uneven voltage distribution along the windings. This article presents a model for the analysis and characterization of the internal voltage distribution and complex impedance in random wound coils. Experimental and theoretical results are presented using frequency response analysis (FRA) and model effectiveness using different approximations is studied. Finally, the frequency domain characterization will allow a time domain analysis, by means of inverse fast Fourier transform (iFFT).Electric Power Components and Systems 03/2007; 35(6). DOI:10.1080/15325000601139708 · 0.66 Impact Factor - [Show abstract] [Hide abstract]

**ABSTRACT:**20 kV distribution networks with all its components, such as transformers, switches, cables etc., have existed and been operating safely for many decades. From an economic point of view, it would be convenient to replace the transformer-motor combination by just a single 20 kV asynchronous motor, even if the motor itself were more expensive. The cost of a transformer, facilities and maintenance gained in this way would easily cover the extra costs of a motor. Efficiency considerations also make elimination of the step-down transformer desirable. Furthermore, modern technological advances make the production of 20 kV asynchronous motors possible, which is proved by the existence of 32 kV generators. The main problem lies in overcoming the differences between the construction of the aforementioned network equipment and the high-voltage asynchronous motor. This paper analyzes the weak points in the insulation system of an asynchronous motor, and proposes improvements allowing motor supply voltage to be increased to 20 kV.IEEE Transactions on Dielectrics and Electrical Insulation 03/2009; DOI:10.1109/TDEI.2009.4784574 · 1.28 Impact Factor