38
NOTE
Tightening must be carried out with the
correct torque.
5.3.2 Main earthing circuit connections between the
panels of the SBR functional unit
a) Install the protection busbar conductor between panels of
the SBR functional unit.
Figure 130. SBR unit protection busbar conductor
b) Connect the L-shaped protection conductor between the
SBR unit and other panels.
5.3.3 Connection of the main earthing circuit for WBC –
WBS units
a) Install the earthing busbar between the units and connect it
to the main earthing circuit.
5.4 Final installation work
Checkpoints
• Check the painted parts of the switchgear for any damage,
touching up where required.
• Check the bolt connections and tighten where required
(especially those made during on-site installation of the
busbars and earthing system.
• Clean the switchgear thoroughly.
• Remove all foreign objects from the units.
• Correctly replace all coverings, etc. removed during the
installation and connection operations.
• Any remaining openings in the switchgear housing must be
closed if they are no longer needed.
• Check that the isolating contacts and interlocking mecha-
nisms operate correctly and, if necessary, grease them
again with Isoflex Topas NCA 52.
• Insert any withdrawable circuit-breaker parts and connect
them to the control cabling.
• Close the unit doors properly.
c) Earthing busbar installed.
Figure 127. Earthing busbar installed
d) The earthing cables can be mounted with bolts, as shown in
Figure 128. The M12 bolt, marked with the earthing symbol,
is reserved for the external station earthing system, the other
M10 bolts (3 pieces) for the cable sheaths or other earthing
systems.
Figure 128. Positions of the earthing cables
e) Connect the earthing cables to the main earthing busbar of
the SBR functional unit.
Figure 129. Main protection earthing busbar of the SBR unit
Summary of Contents for UniSec
Page 2: ......
Page 30: ...30 4 8 Coupling the units with switch disconnector to WBC unit 24 kV Figure 98 Figure 99 ...
Page 43: ......
