An on-line monitoring method and system for distribution transformer winding deformation

Abstract

The application discloses an online monitoring method and system for winding deformation of a distribution transformer. The method comprises the following steps: collecting three-phase current and voltage signals of a primary side and a secondary side of the distribution transformer when the distribution transformer is running with a load, and performing fast Fourier transform to obtain current and voltage phasors of the primary side and the secondary side; calculating equivalent three-phase parameters according to the current and voltage phasors of the primary side and the secondary side, and performing disturbance processing on the equivalent three-phase parameters to obtain disturbed three-phase parameters; constructing a resistance and reactance matrix equation based on the equivalent three-phase parameters and the disturbed three-phase parameters, and solving the equation to obtain three-phase short-circuit reactance values; and displaying winding deformation alarm prompts if the three-phase short-circuit reactance values are abnormal. Therefore, only current and voltage need to be sampled when the distribution transformer is running, the load of the transformer does not need to be adjusted, the short-circuit reactance of the transformer can be measured, winding deformation can be quickly and accurately judged, and the efficiency of winding deformation monitoring of the transformer is improved.

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