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Why should the transformer be tested for winding deformation?

Winding deformation is a hidden danger of the safe operation of power transformers. The practical experience of multiple transformers shows that after the winding is deformed, the insulation test and the oil test are difficult to find, so it is a latent fault.


In the course of operation or transportation, a power transformer inevitably suffers from the impact of various short-circuit currents or physical impacts. Under the action of the powerful electrodynamic forces generated by the short-circuit current, the transformer windings may lose stability, causing local distortion, bulging, or shifting. The phenomenon of permanent deformation, etc., so the transformer windings need to be measured to ensure the safe use of the transformer.


When transformers have short circuit or phase short circuit during the test, short circuit or other faults may cause coil shift due to electromagnetic pull during operation, and the relative displacement of coils may occur during transmission. These factors will change the distribution parameters of the transformer. The frequency domain response also changes, according to the frequency domain response curve to determine the degree of deformation of the transformer.


Transformer winding deformation analyzer can accurately draw the response curve of each phase frequency domain, through the measurement of the curve of the horizontal and vertical contrast, can accurately determine the deformation of the transformer.

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