Spore, Starch, Tire Wear, Etc. From Transformer Oil
The transformer was an "air-breather". The filtration was not very effective and as a result
significant quantities of airborne particles entered into the system. This set of particles
contain very few metallic elements other than carbon, with some silicon and calcium in the
tire wear particle. The spore is identified by its morphology. The starch by its morphology
and the black cross pattern when viewed with crossed or slightly off crossed linear polarized
light. These materials are all from outside the transformer.
Transmitted Off Crossed Polarized Light Illumination
Foreign contaminants are those particles that are not manufacturing, assembly, maintenance, wear, or aging generated
particles. They are particles inadvertently added to the system from an uncontrolled source.
Significance in the Environment:
The presence of these particles indicates the degree of control exercised over the environment under consideration.