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Black on Paper, Transformer Fretting Wear Through the Microscope

Discolored Paper from a Transformer

This is a tapelift from a section of black discoloration on paper insulation from a transformer. The paper fibers show mechanical degradation. Metallic depolarization at the edges of particles can't be seen if the polarizers are not crossed.

Transmitted Off Crossed Circular Polarized light


Significance in the Environment:

Characteristic Features:

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