Maintenance and Troubleshooting
Inspect For
Sub-Assembly
Item
1. Cleanliness
2. Contact erosion. Note: Perform with Manual Spring Checks
3. Vacuum integrity. Note: Perform with High Potential Tests
Vacuum InterrupterPrimary Power Path
Table 7. Periodic Maintenance and Lubrication Tasks
Vacuum Interrupter
Contact Resistance
1. Record contact resistance with contacts closed, and re-check
each year to monitor condition.
Interrupter Operator
Mechanism
Cleanliness
1. Dirt or foreign material
Fasteners 1. Tightness of nuts and other locking devices.
Manual Spring Check
1. Smooth operation of manual charging, and manual
closing and 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, Auxiliary
Switches, Secondary
Disconnect
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, 60 Hz.
Refer Table 3 for Voltage to be used.
Control Circuit
to Ground
1. 60 second withstand, 1500V, 60 Hz
Insulation Barriers and all
Insulating Components
1. Cleanliness
2. Cracking, crazing, tracking, or other sign of deterioration
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