Table 6.
Maintenance Tasks
The list of tasks in
Table 6
does not represent an exhaustive
survey of maintenance steps necessary to ensure safe operation
of the equipment. Particular applications may require further
procedures. Should further information be desired or should
particular problems arise which are not covered sufficiently for
the Purchaser’s purposes, the matter should be referred to the
local Siemens sales office.
Lubrication
It is essential that switchgear be lubricated carefully and properly
to guard against corrosion and to insure that all operating parts
work freely.
Old grease should be removed annually and parts relubricated.
Relubricate at more frequent intervals if required with
Siemens lubricant Part No. 15-337-131-001.
Moving Parts
Lubricate shutter guide, bearings, rollout fuse truck moving
parts, etc., with dry spray lubricant Siemens Part No. 15-171-
270-001. Note: Use of lubricant not suitable for the application
will make the mechanism very difficult to operate.
Electrical Contacts
Lubricate stationary silver-surfaced contacts with electrical
contact lubricant Part No. 15-171-370-002 prior to use, as follows:
1.
Wipe contacts clean.
2.
Apply lubricant to contact surfaces.
3.
Wipe off excess lubricant, leaving a film. Avoid getting
lubricant on insulation.
Cleaning Insulation
Most of the plastics and synthetics used in insulation systems
are attacked by solvents containing aromatics or halogenated
hydrocarbons. The use of these may cause crazing and
deformation of the material reducing the dielectric strength.
ISOPROPYL ALCOHOL IS THE ONLY RECOMMENDED
SOLVENT CLEANER.
1. Before any maintenance work is performed within
primary compartments, make certain that the equip-
ment is completely de-energized, tested, grounded,
tagged or properly identified and released for work in
an authorized manner.
2.
Before starting work on the switchgear, the following
should be completed on any equipment that will affect
the area of the work:
A.
Disable remote control and automatic transfer
schemes.
B.
De-energize all direct and back feed power and
control sources, test and ground.
C.
Disconnect all voltage and control power trans-
formers.
D.
Open all disconnects.
3.
Include the following items in your inspection procedure:
A.
Check general condition of switchgear installation.
B.
Inspect switchgear interior for accumulation of
dust, dirt or any foreign matter.
C.
Clean air filters by washing in any mild household
detergent.
D.
Examine indicating lamps and replace as required.
E.
Check terminal block contacts for loose connec-
tions.
F.
Check instrument and control switches and
inspect their contacts.
G.
Check for proper condition of instrument trans-
formers. Replace burned out fuses, if any. Check
primary and secondary connections.
H.
Remove dust from all insulators and insulation.
I.
Inspect bus bars and connections for proper con-
dition. If bus bars are overheating check for poor
or loose connections or for overload.
J.
Examine automatic shutters for proper operation.
K.
Examine all safety interlocks.
L.
Perform maintenance of circuit breakers as out-
lined on circuit breaker instruction manual.
M. Check space heaters and thermostat (if equipped)
for proper operation.
N.
Maintain other equipment per their respective
instruction book requirements.
O.
Lubricate mechanisms, contacts, and other moving
components.
P.
Replace, reassemble, re-insulate, return all items
to proper operating conditions and remove
grounds prior to energization.
Maintenance
46
The use of unauthorized parts in the repair of the equipment, or
tampering by unqualified personnel will result in dangerous
conditions which can cause death, serious injury or equipment
damage. Follow all safety instructions contained herein.
Hazardous voltages.
Will cause death, personal injury, and
property damage.
Do not open shutters unless both line/load and
bus are first de-energized.
DANGER
