How to judge whether the transformer winding is deformed

How to judge whether the transformer winding is deformed

Transformer winding deformation refers to the irreversible change of the size or shape of the winding under the action of electric and mechanical forces. It includes changes in axial and radial dimensions, body displacement, winding distortion, bulge and short circuit between turns, etc.

There are several ways to determine whether the transformer winding is deformed.

Frequency response method: By injecting a scanning signal source from one end of the winding to ground, the frequency domain function of the characteristic parameters of two ports of the winding is measured. The characteristic of frequency domain diagram of port parameters is analyzed to judge the structural characteristic of winding, to realize the purpose of diagnosing the winding deformation.

Low voltage short circuit impedance method: Use a special transformer short-circuit impedance tester to test.

comprehensive analysis method: When the winding short circuit accident, in addition to measuring deformation should be carried out some routine tests and special tests. It is also necessary to make a comprehensive analysis to judge the deformation of transformer winding by combining the size of short circuit current and the length of short circuit time.