Failure Analysis of Transformers
Transformer Microsections
Failure analysis of transformers involves a combination of x-ray imaging, dissection, microsectioning, optical microscopy, and SEM/EDS analysis in order to isolate and characterize the root cause of the failure, since transformers are very often potted in an encapsulant.
Failures in transformers and a transformer microsection are shown below.
Transformers
SEM image of transformer in cross section.
Transformer primary winding after the secondary winding was removed.
Measuring transformer wire diameter.