44
Sub-assembly Item Inspect for
Primary power path
Vacuum interrupter
1. Cleanliness.
2. Contact erosion.
Note: Perform with manual-spring checks.
3. Vacuum integrity.
Note: Perform with high-potential tests.
Vacuum interrupter contact resistance
1. Record contact resistance with contacts
closed and check at each maintenance
interval to monitor condition.
Vacuum interrupter operator mechanism
Cleanliness 1. Dirt or foreign material.
Fasteners 1. Tightness of nuts and other locking devices.
(Stored-energy) manual-spring check
1. Smooth operation of manual charging,
manual closing and manual tripping.
Lubrication
1. Evidence of excessive wear.
2. Lubrication of wear points.
Electrical controls
Wiring 1. Mechanical damage or abrasion.
Terminals and connectors
1. Tightness and absence of mechanical
damage.
Close and trip solenoids, anti-pump relay and
auxiliary switches
1. Automatic charging.
2. Close and trip with control power.
High-potential test
Primary circuit-to-ground and between primary
disconnects
1. 60-second withstand 37.5 kV, 45 kV or 60 kV,
60 Hz (53 kV, 64 kV or 85 kV dc).
Control circuit-to-ground 1. 60-second withstand 1,125 V, 60 Hz.
Insulation Barriers and all insulating components
1. Cleanliness.
2. Cracking, crazing, tracking or other sign of
deterioration.
Space heaters Space heaters 1. Correct operation.
Table 8: Periodic maintenance and lubrication tasks
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