FIELD: electricity.
SUBSTANCE: under normal and (or) emergency mode of operation of a three-winding transformer, phase or linear voltages and currents are registered in three various loading modes. The first harmonic component is extracted from registered currents and winding voltages. Symmetrical components of produced currents and voltages are determined. With the help of the produced values, through solving of a system of equations of power transformer condition made on the basis of a substitution circuit, in which magnetisation branch resistance is taken into account, active and inductive resistances of each winding are determined. The technical condition of the transformer is assessed by deviation of the produced parameters from the reference ones. At the same time resistance of the magnetisation branch is identified.
EFFECT: improved accuracy of three-winding transformer condition assessment.
3 dwg
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