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Graphene in Coke Deposits

Graphene Layering in Coke Deposit on LTC Contacts

This image shows the crystal structure density and orientation of graphene in the coke deposit on a Load Tap Changer (LTC) contact. The intensity of the blue or yellow shows the degree of crystallinity while the blue indicates that the omega refractive index is oriented NE-SW and yellow indicates the omega refractive index is oriented NW-SE.

Reflected Crossed Polarized Light with Red Plate Compensator


Significance in the Environment:

The coking of LTC contacts can cause the connecting transformer to fail.

Characteristic Features:

Associated Particles:


Savage, G., CARBON-CARBON COMPOSITES, Chapman & Hall, 1993

Presentation that discusses Coking in LTCs: