3. INSTALLATION OF THE SWITCHGEAR AT SITE 39
Installation of the connecting conductors
• The upper flat conductors for connection of the
voltage transformer sockets are fixed in a
transport position at the works. Release the
upper fastening screws on the flat conductors
so far that the flat conductors can be easily
turned around the fastening screws (the screws
remain in position). Turn the flat conductors so
that their lower bores are aligned with the bores
of the flat conductors in the adapter box.
• Connect the upper flat conductors to the flat
conductors in the adapter box using
countersunk screws, dished washers and nuts.
Hazard warning
The correct position of the flat
conductors is important for their
function! See fig. 3.3.5.3 for the correct
position of the flat conductors.
• Tighten the relevant screws, applying the
specified torque.
• Replace the drying agent bag on the profile
behind the assembly opening of the top-
mounted box with a new drying agent bag.
• Clean the sealing ring for the side assembly
cover on the top-mounted box, the slot in the
assembly cover and the sealing surface for the
o-ring on the top-mounted box.
Important note
Thinly grease the entire surface of the
sealing ring with silicone paste.
• Lay the sealing ring in the slot of the assembly
cover. Move the cover into the installation
position and tighten the fastening nuts across
the diagonal with the specified torque.
• Evacuate and fill the gas compartment (busbar
compartment, adapter box and top-mounted
box) with SF
6
as described in manual HB 645 en.
Use the filler valves on the busbar
compartments. Check the gas compartment for
leakage.
• The instructions for installing the voltage
transformers can be found in the section
entitled “Handling of voltage transformers”.
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