S225-12-1
11
!
SAFETY
FOR LIFE
Contact Erosion Patterns
Figure 13.
Contact life stages.
Contact Inspection
Tap-changer contacts are exposed to a combination of
electrical, mechanical, and thermal conditions that result
in deterioration. Erosion at the points subjected to arc-
ing duty is the most visible indication of wear. Figure 13
illustrates typical contact erosion patterns resulting from
normal service. Contact at the end-of-life stage shown in
Figures16 and 19 must definitely be replaced. The fol-
lowing figures show the actual contact after varies stage
of contact erosion.
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