42 MNS-SG Operation and Maintenance | Manual
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Maintenance
For equipment that is arc-resistant, ensure that flaps on the
rear doors or covers are open and chimney flaps are closed.
See Prepare to Energize Switchgear in this manual.
6.5.
Inspect busbars
Changes in environmental conditions can cause the busbar
mounting components to loosen over time.
During scheduled inspections, check the condition of the
busbar system in locations where it is possible to access
them. The components that can be removed to provide
busbar access include the rear panels, side walls,
segregation barrier between the cable compartment and
main busbar compartment, and the roof plates.
6.6.
Exterior metal damage repair
Any scratches or damage to the surface of the vertical
sections must be repaired in order to avoid oxidation, which
can reduce the life of the equipment.
6.7.
Maintenance schedule
It is highly recommended that you establish a periodic
maintenance program for the switchgear. The frequency of
maintenance activities depends on equipment usage and
the operating environment.
Perform a visual inspection, front and rear, to see that there
is no evidence of loose parts, warping or undue vibration.
Take steps to remedy any deficiencies of this nature that
may appear. Keep the assembly dry. Cover to prevent
moisture from dripping on the equipment. Do not block
vents.
There are hazards of electrical shocks and/or burns
whenever working in or around electrical equipment. Turn
off power ahead of the switchgear before performing any
maintenance operations.
Check incoming line terminals to verify that the equipment
is de- energized. Check the out-going terminals to make
sure that no feedback conditions exist.
Limit the use of solvents to removing grease and
contamination from primary conductors, insulation, and
from unpainted metallic surfaces. Do not use alcohol or
Freon. Use OSHA-approved solvents in accordance with local
regulations. Use a non- flammable solvent with a threshold
limit of 300 PPM or higher. Use solvents in well-ventilated
areas.
6.7.1.
Semi-annual inspection
At least twice yearly, perform a thorough inspection of the
switchgear. Emphasize the following checks:
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Perform an overall visual inspection.
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Check all indicators, meters and instruments for proper
operation.
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Make sure all bolted panels are secure.
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Verify operation of heaters and thermostats, if used.
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Check for undue noise or vibration that might loosen bolted
connections.
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Look for evidence of moisture in the switchgear.
6.7.2.
Annual inspection
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Bolted connections should be tight. Discoloration, excessive
corrosion, embrittled or discolored insulation may indicate
an overheated connection.
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Inspect all cables for tight connections and ample support.
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Inspect control wiring for signs of wear and damage.
Replace wires wherever doubtful.
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Examine resistors and other devices prone to overheating.
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Open all hinged panels and remove all bolted panels.
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Clean insulation thoroughly.
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Withdraw and clean all drawout components.
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Clean the stationary portion of the switchgear by wiping
with a clean cloth.
Compressed dry-air is useful with inaccessible areas.
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Remove covers of all panel devices where possible. Check
wiring for secure connections. Clean contacts on relays and
switches wherever necessary.
Replace covers.
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Inspect the gearing of the overhead lifting device when
used. Keep well lubricated. In very dirty or gritty conditions,
use a dry lubricant.
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Follow the recommendations of any individual device
instructions furnished for maintenance of the device.
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