125
Figure 195:
Figure 197:
Figure 199:
Changeover of the earthing
switch signalling contacts
Anti-ferroresonance resistor
Shutter lifting truck in
circuit-breaker compartment
—
9. Maintenance
9.5 Repairs
Repair on switchgear assemblies
Repair of surface damage:
• Carry out repair work immediately after a
defect has been discovered.
• Completely remove all rust from damaged
paintwork areas on steel sheet and other
steel parts by mechanical means, e.g. with a
wire brush.
• Lightly grind the surrounding paint coat and
carefully degrease the entire area. Then
immediately apply an anti-rust primer and,
after an appropriate hardening time, apply
the top coat. Only use suitable and
compatible paint products.
• Apply the top coat in standard RAL 7035
colour, or the relevant special colour.
• Carefully remove any white rust on high
quality galvanized steel surfaces with a wire
brush or cleaning pad, e.g. Scotch-Brite, and
clean loosely adhering particles with a dry,
non-fraying cloth. Next treat the cleaned
parts with zinc spray or zinc powder paint
and, finally, treat with aluminium spray for
colour matching.
• Carefully remove any white rust from
passivated operating parts and rust
formation on phosphatised parts with a wire
brush or metal-free cleaning pad, e.g. Scotch-
Brite, and clean with a dry cloth. Then grease
evenly (with mechanical grease for moving
parts).
Replacement of the contact pins when the surface
is damaged. After any required replacement of
contact pins, the latter should be retightened
using the socket head bolts - see table in "6.3
Assembly of the switchgear panels".
Repair on earthing switch signaling contact
The auxiliary switches of the interchangeable
groups are adjusted at the factory. When final
installation of the earthing switch and operator
takes place on site, it may be necessary to carry
out further precise adjustment of the auxiliary
switch. In this case, the following should be taken
into account:
• There must be a run-on of 0.5 mm in the fully
operated position before the plunger reaches
the stop (for safety reasons).
• Auxiliary limit switch 4 (Figure 201) for
earthing switch ON must be operated in the
range of movement of the lever 5° - 10°
before the end position.
• Auxiliary limit switch 1 for earthing switch
OFF must be:
- operated on earthing switches with
manual mechanisms during the opening
movement of slide 2 before half of the
hexagonal shaft has become visible, or 1
mm before the tab of the slide makes
contact with the armature of the de-
energised locking magnet.
- operated on earthing switches with
motor operator (no slide 2 fitted)
immediately after the toggle spring
mechanism has passed the dead centre
position during rotation to the OFF
position.
• In cases where there has been an internal arc
is necessary to repair and clean the whole
substation.
Repairs on Monitoring and Diagnostics
equipment
• In case of sensor fault, replace the sensor
(For more information refer to document
9AKK108468A6476 - Monitoring and
diagnostics guideline for UniGear ZS1
switchgear)
• Remove faulty sensor
• Treat the surface beneath the sensor if
necessary (remove dust, dirt, corrosion)
• Install new sensor following the procedure in
document 9AKK108468A6476 - Monitoring
and diagnostics guideline for UniGear ZS1
switchgear.
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