FIELD: electricity.
SUBSTANCE: at different frequency actual and imaginary components of winding impedance are measured, impedance locus is plotted and compared with the reference locus and then against the criterion winding defect in result of turn-to-turn short circuit is stated. Locus of the previous measurement is used as the reference locus. Comparison is made against frequency based locus of vector difference in impedance of locus diagrams. Increase in area of vector difference locus is taken as the criterion.
EFFECT: improved accuracy, reliability of test results.
4 dwg
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