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60
Maintenance
Power/Vac® Metal-Clad Switchgear 5kV & 15kV
01.4IB.67000
Only use denatured alcohol or isopropyl
alcohol to clean the insulation. Wear
protective gloves and goggles and clean
the main bus bar in a well ventilated area.
Wipe dirt or other foreign matter from the
insulation with a clean cloth saturated with
only denatured or isopropyl alcohol.
Inhalation of vapor could result in minor or
moderate injury.
!
Use only the cleaners recommended in this
document. Failure to do so could result in
equipment damage.
3) Racking Mechanisms
Clean the mechanisms and lubricate wear
points. The application of lubricants should
be held to a minimum, which reduces the
accumulation of dust and dirt. A periodic
overhaul of the racking system should be
carried out if more than 500 operations are
expected in its lifetime.
4) Primary Disconnect Device Contacts
Check the primary disconnect device
contacts for signs of abnormal wear or
overheating. Clean the contacts with a
silver polish. Discoloration of the silvered
surfaces is not ordinarily harmful, unless
the atmospheric conditions cause deposits,
such as sulfides on the contacts. If
necessary, the deposits can be removed
with a good grade of silver polish. Before
placing or replacing the circuit breaker
into service, apply a thin coat of contact
lubricant to main contacts for lubrication.
5) Disconnecting Contacts
Inspect all primary and secondary
disconnecting contacts, such as those on
rollout transformers for abnormal wear,
fatigue, or overheating. Replace the
contacts if necessary. Otherwise, clean the
main disconnecting contacts with a good
grade of silver polish and lubricate with
contact grease as needed.
6) Control Contacts
Contacts should be inspected and dressed
or replaced when the surface becomes
seriously pitted. Unless repetitive duty has
been experienced, little attention should be
required.
7) Secondary Wiring
Check all wiring connections for tightness,
including those at the current and potential
transformers and at the terminal blocks
where circuits leave the switchgear. Ensure
that all secondary wiring connections are
properly connected to the switchgear
ground bus.
8) Mechanical Parts
Visually check and manually operate
mechanical moving parts such as the
shutter, TOC, and MOC assemblies, and
also check the hinged doors. Examine
mechanical mating parts such as the
levering-in arms and the mating guide
channels.
9) Ventilation
Check all labyrinths, grillwork, and
air passages for obstructions and
accumulations of dirt. The air space around
the switchgear, which is necessary for
the entrance of ventilating air, should be
cleaned of possible debris.
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