Abstract
The article presents the results from elaborating a power transformer mathematical model for modeling the processes of diagnosing the mechanical state of windings using the method of low-voltage nanosecond pulses. The model includes a chain representation of the transformer windings taking into account the dependence of the resistance and reactance of the turns on the frequency spectrum of the pulse supplied from the probing generator. The study of the pulse flaw detection processes carried out on the developed mathematical model has shown that the probing pulse frequency spectrum plays an essential role in locating the transformer winding flaw, in determining the flaw type (displacement of turns, inward radial displacement, buckling). The response signals obtained from application of the simulated probing pulse coincide satisfactorily with the response signals obtained during experiments on the transformer physical model. The developed model opens the possibility of determining, by calculation, transformer winding flaw location and type based on comparing the results of experimental responses during examinations of transformers using the method of low-voltage nanosecond pulses with the simulation results.
Published Version
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