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Maintenance and Troubleshooting
Table 7. Periodic Maintenance and Lubrication Tasks
Sub-Assembly
Primary Power Path
Interrupter Operator
Mechanism
Electrical Controls
High Potential Test
Insulation
Item
Vacuum Interrupter
Vacuum Interrupter
Contact Resistance
Cleanliness
Fasteners
Manual Spring Check
Lubrication
Wiring
Terminals and
Connectors
Close and Trip
Solenoids, Anti-Pump
Relay, Auxiliary
Switches, Secondary
Disconnect
Primary Circuit to
Ground and between
Primary Disconnects
Control Circuit
to Ground
Barriers and all
Insulating Components
Inspect For
1. Cleanliness
2. Contact erosion. Note: Perform with Manual Spring Checks
3. Vacuum integrity. Note: Perform with High Potential Tests
1. Record contact resistance with contacts closed, and re-check
each year to monitor condition.
1. Dirt or foreign material
1. Tightness of nuts and other locking devices.
1. Smooth operation of manual charging, and manual
closing and tripping.
1. Evidence of excessive wear
2. Lubrication of wear points
1. Mechanical damage or abrasion
1. Tightness and absence of mechanical damage
1. Automatic charging
2. Close and trip with control power
1. 60 second withstand, 60 Hz.
Refer Table 3 for Voltage to be used.
1. 60 second withstand, 1500V, 60 Hz
1. Cleanliness
2. Cracking, crazing, tracking, or other sign of deterioration
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