NETA
recognizes that the ideal maintenance program is reliability-based,
unique to each plant and to each piece of equipment.
In the absence of this information and in response
to requests for a maintenance timetable, NETA's Standards
Review Council presents the following time-based maintenance
schedule and matrix.
One
should contact a NETA Full-Member company for a reliability-based
evaluation.
The
following matrix is to be used in conjunction with
NETA's Frequency of Maintenance Tests table. Application
of the matrix is recognized as a guide only.
Specific
condition, criticality, and reliability must be determined
to correctly apply the matrix. Application of the matrix,
along with the culmination of historical testing data
and trending, should provide a quality electrical preventive
maintenance program.
|
MAINTENANCE
FREQUENCY MATRIX
|
| |
EQUIPMENT CONDITION
|
|
POOR
|
AVERAGE
|
GOOD
|
|
EQUIPMENT RELIABILITY REQUIREMENT
|
LOW
|
1.0
|
2.0
|
2.5
|
|
MEDIUM
|
0.50
|
1.0
|
1.5
|
|
HIGH
|
0.25
|
0.50
|
0.75
|
Based
on the table and the following equipment schedule,
equipment in average condition with good reliability
would be tested and serviced as follows:
Main
switchgear Every
3 Years
Transformers
Dry Type Every
3 Years
Metal
Enclosed Busways Every
3 Years
Low
Voltage Air Switches Every
4-5 Years
Low
Voltage Molded Case Breakers Every
4-5 Years
Protective
Relays Every
1.5 Years
Ground
Fault Relay Systems Every
1.5 Years
A.
C. Motors Every
3 Years
M.
C. C. Low Voltage Every
3 Years
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