Page 389 - Decision Making Applications in Modern Power Systems

Maintenance management with application Chapter | 13 351

TABLE 13.9 Function of pertinence of the severity according to the oil.
Zone Qualification Operation of machines
A [N] Normal Commissioned machines should generally
operate in this area
Water% volume % # 0.2
Micron iron % # 49
content
Micron copper % # 19
content
B [A] Alert Unsatisfactory for continuous operations for
long periods
Water% volume 0.3
Micron iron 50
content
Micron copper 20
content
C [C] Critical It is sufficient to cause damage to the machine
at any time
Water% volume Above 0.3
Micron iron Above 51
content
Micron copper Above 21
content

TABLE 13.10 thermography to determine hot spots.
(Zone) (Thermography)
(A) ([N] Normal less or equal 94.0 F)
B [P] Permissible
(B/C) (94.0 F) (164.2 F)
C [A] Alert
(C/D) (164.2 F) (199.3 F)
(D) [C] Critical above 199.3 F