Particles from many different sources are found in transformer oil. These are
just a few examples. The file that follows contains images of
specific types of particles with reference to their source.
Welding
Grinding 
Heat-Treat Scale Iron Wear 
Bronze Wear 
Copper Wear 
Paint 
Gasket Wood Other 
New Paper Fiber 
Aged Paper Fiber 
Aged Paper 
Charred Paper 
Charred Wood 
Other Aged Cellulose 
Natural Minerals
Pollens 
Tire Wear 
Fungal Debris 
Other 
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. 
|
