Siemens 38-3AH3 38 kV instruction manual Maintenance and troubleshooting, Sub-assembly 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.

Primary disconnects

1.

Burnt or damaged fingers.

2.

Lubrication of contact surfaces.

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.

Manual-spring check

1.

Smooth operation of manual charging,

manual closing and manual tripping.

Lubrication

1.

Evidence of excessive wear.

2.

Lubricaion 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,

1.

Automatic charging.

auxiliary switches and secondary

2.

Close and trip with control power.

disconnect

High-potential test

Primary circuit-to-ground and between

1.

60-second withstand 60 kV, 60 Hz

primary disconnects

(85 kV dc).

Control circuit-to-ground

1.

60-second withstand 1.5 kV, 60 Hz.

Insulation

Barrier and all insulating components

1.

Cleanliness.

2.

Cracking, crazing, tracking or other sign

of deterioration.