Rapid Determination of the Over-Transient Longitudinal Reactance
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2013, Vol 37, Issue 37
Abstract
The paper presents an original method to determine the over-transient reactance by the longitudinal axis of a synchronous generator, starting from the symmetric three-phased sudden short-circuit test, from the dry run and symmetrical three-phased short-circuit tests. The current normative recommends determining the longitudinal overtransient reactance using sudden triphased short-circuit tests. This method, however, necessitates many omputations and graphical plots. Plotting values is a source of errors that lead to un-realistic results, while the many computations are time consuming. The method we present in this work relies on phenomena in the stator and excitation windings of the synchronous generator that appear during test phases. We present the general equations necessary to compute the longitudinal over-transient reactance and the experimental results obtained by tests on an existing synchronous generator, using previously known methods. To collect parameter values during the symmetric triphased sudden short-circuit test, from the dry run test and symmetrical three-phased short-circuit test we used a 15 channel acquisition tool that allowed us to collect 25000 values per second per channel. Computations were done using LabView. Making the stator and excitation windings phenomena known to design engineers helps them to quickly check size determination computations, and to rapidly and correctly check parameter value determinations by testing. The method presented in this work is not found in the current electric machines regulations.
Authors and Affiliations
Elisabeta Spunei, Ion Piroi, Florina Piroi
Keywords
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