Particles from Transformer Oil Under the Microscope

Particles from One Transformer

All of the particles that follow are from one 50 milliliter oil sample collected from a 8400 kVA Transformer. The transformer reportedly had a gas blanket and was sealed. The particles indicate otherwise. The large number of degraded paper fibers in this sample indicate severe degradation of the paper insulation and there is evidence of charring of the paper at some locations.

Diatomaceous Earth

Diatomaceous Earth

Degraded Paper

Degraded Paper

Degraded Paper

Natural Minerals

Natural Minerals

Feldspar

Copper Abrasive Wear

Contact Wear

Contact Wear

Charred Paper

Charred Paper

Coke

Mixed Particles

Polymer Flake

Paint Flake

Silver Scuffing Wear

Silicon Carbide

Corn Starch