9
Maintenance or Test
Recommended Interval
Operational test
Each shift staffed plants
Each visit unstaffed plants
Each visit unstaffed plants
Functional test
Annually
Lightning or surge arresters provide protection for important equipment from high-
energy surges. These arresters are static devices which require fairly infrequent
maintenance. Most maintenance must take place while the associated circuit is
de-energized. However, crucial visual inspections and infrared scans can take place
while energized.
energy surges. These arresters are static devices which require fairly infrequent
maintenance. Most maintenance must take place while the associated circuit is
de-energized. However, crucial visual inspections and infrared scans can take place
while energized.
Maintenance or Test
Recommended Interval
Reference
Review equipment rating
5 years
North American Electric Reliability
Council (NERC) Planning
Standard
Council (NERC) Planning
Standard
Visual inspection with
binoculars
binoculars
Quarterly to semi-annually
Reclamation Recommended
Practice
Practice
Clean porcelain and check
connections
connections
3-6 years
Ambient dependent
Ambient dependent
Manufacturer's Instruction Books
Doble test (power fre-
quency dielectric loss, direct
current [DC] insulation
resistance, power factor)
quency dielectric loss, direct
current [DC] insulation
resistance, power factor)
3-6 years
Ambient dependent
Ambient dependent
Doble Test Data Reference Book,
NFPA 70B
NFPA 70B
Infrared scan
Annually
NFPA 70B 18-17