Maintenance And Troubleshooting - Siemens GMSG Instruction Manual

Sub-assembly
Primary power path
Vacuum interrupter operator mechanism
Electrical controls
High-potential test
Insulation

Maintenance and troubleshooting

Item
Vacuum interrupter
Primary disconnects
Vacuum interrupter contact resistance
Cleanliness
Fasteners
Manual-spring check
Lubrication
Wiring
Terminals and connectors
Close and trip solenoids, anti-pump relay,
auxiliary switches and secondary
disconnect
Primary circuit-to-ground and between
primary disconnects
Control circuit-to-ground
Barrier and all insulating components
Table 7: Periodic maintenance and lubrication tasks
Inspect for
1. Cleanliness.
2. Contact erosion. Note: Perform with
manual-spring checks.
3. Vacuum integrity. Note: Perform with
high-potential tests.
1. Burnt or damaged fingers.
2. Lubrication of contact surfaces.
1. Record contact resistance with contacts
closed and check at each maintenance
interval to monitor condition.
1. Dirt or foreign material.
1. Tightness of nuts and other locking
devices.
1. Smooth operation of manual charging,
manual closing and manual tripping.
1. Evidence of excessive wear.
2. Lubricaion 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 14 kV or 27 kV or
28.5 kV, 60 Hz (20 kV or 38 kV or
40 kV dc).
1. 60-second withstand 1.5 kV, 60 Hz.
1. Cleanliness.
2. Cracking, crazing, tracking or other sign
of deterioration.
59