Repair; Switchgear In General - ABB Uniswitch Operation And Maintenance Manual

5.5 Repair

5.5.1 Switchgear in general

Instructions
ABB
Uniswitc h Operation and
Maintenanc e Manual
•
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 roughen 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 paints products.
•
Apply the topcoat in standard RAL 7035 color, or the relevant
special color.
•
Carefully remove any white rust from:
aluminum/zinc surfaces with a wire brush or cleaning pad, e.g.
o
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 aluminum spray for
color matching.
passivated operating parts and rust formation on phosphatised
o
parts with a wire brush or metal-free cleaning pad, e.g. Scotch-
Brite, and clean with a dry cloth. Then grease evenly (with
Isoflex Topas NB 52).
! Follow the maintenance instructions in the manuals for
individual equipment components.
•
Check that the bolt connections at the contact points in the busbar
system and the earth connections are tight, and that the contact
system functions correctly.
•
Where necessary, grease slide plates and bearings in the cubicle
again or thoroughly clean them. Then grease them again with
Isoflex NB 52 lubricant.
Table 5.2 Tightening torques
Connection
Busbar - busbar
Busbar - SF6 circuit-breaker
Busbar - Vacuum circuit-breaker
Busbar - switch-disconnector (SFG)
Busbar - current transformer
Tightening torque
35 Nm
20 Nm (upper poles)
35 Nm (lower poles)
68 Nm
35 Nm
50 Nm
UNI S14GB 05-02
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