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An approach for the use of Wigner-Ville Distribution (WVD), a time frequency analysis method, for the detection of winding deformation during short circuit test of a transformer is presented. The method is validated through experiments conducted on a specially designed 6.6 kV voltage transformer. The results of time frequency analysis approach using WVD and time scale analysis using Wavelet Transform...
Instrument transformers, namely, current and voltage (potential) transformers are characterized by their ratio and phase errors. A novel virtual instrument that determines the errors of an instrument transformer using a quasi-balance technique is proposed in this paper. Operating on the secondary quantities of the test and standard transformers, two independent quasi-balance conditions are obtained...
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