Frequency Characteristics of Generator Stator Windings

Frequency Characteristics of Generator Stator Windings

Charles Su (Charling Technology, Australia)
DOI: 10.4018/978-1-4666-1921-0.ch004
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Abstract

A generator stator winding consists of a number of stator bars and overhang connections. Due to the complicated winding structure and the steel core, the attenuation and distortion of a pulse transmitted through the winding are complicated, and frequency-dependent. In this chapter, pulse propagation through stator windings is explained through the analysis of different winding models, and using experimental data from several generators. A low voltage impulse method and digital analysis techniques to determine the frequency characteristics of the winding are described. The frequency characteristics of generator stator windings are discussed in some detail. The concepts of the travelling wave mode and capacitive coupling mode propagations along stator winding, useful in insulation design, transient voltage analysis, and partial discharge location are also discussed. The analysis presented in this chapter could be applied to other rotating machines such as high voltage motors.
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Frequency Characteristics Of Generator Stator Windings

In the analysis of frequency characteristics of generator stator windings, an equivalent circuit may be valid only in a certain frequency range. Thus several equivalent circuits may be required to cover an extensive frequency range. Obviously, generator stator windings have more complicated structures than a homogeneous single layer transformer winding. However, at lower frequencies, the capacitance between overhang connections can be ignored, and the stator winding can be treated as several homogeneously distributed coils, with the capacitance to ground connected to both ends of each coil. Such a Π-network is commonly used to simulate a transmission line in a transient network analyser (TNA). As explained in the Appendix, the Π-network simulation is valid only within a certain frequency range. The network can be analysed using the transmission line differential equations.

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