44
5.6.2 Busbar compartment access
Access to the busbar compartment is possible
either from the top of the panel after dismounting
the pressure relief plate 1.1 (figure 2) before the
mounting of the gas duct, or from the front of the
circuit-breaker compartment.
After circuit-breaker 13 (figure 2) has been with-
drawn from the panel, it is possible to dismount
horizontal partition 20 by unscrewing nr.4 screws
holding the partition from the inside.
After that, the partition 9 can be dismantled (by
unscrewing nr.7 screws) and taken out of the
panel, which makes access to busbars from the
circuit-breaker compartment possible.
Figure 69: accessing busbar compartment
5.6.3 Busbars installation
• Install the busbars panel by panel according to the ratings of the switchgear (figures 70÷77). Screw
on the individual busbar elements one above the other (depending on the system layout) and in line
with the flat branch conductor.
For the tightening torque please make reference to the table at page 40. Use two dished washers
for each screw. Use screws of tensile class 8.8.
• Bolt one holder 58.1 (figure 67, 68) to each end of the busbars to support insulating cover 58. The
screws for holder 58.1 must be tightened with a lower torque. (For insulated busbars only).
• Position insulating covers 58 and lids 58.5 over the relevant bolted joint, and slide the lid onto the
cover until it clicks into place. (For insulated busbars only).
Note:
Busbar connection is carried out with so-called “stabilized connections”.
This means that quality of the copper busbar connections does not change according to the operating
time and therefore it is not necessary to inspect tightness of busbar connections regularly. But this is
on condition that correct assembly is carried out as described above and especially that all connections
are tightened with the prescribed torque according to the above table.
We recommend only inspecting tightness of busbar connections during inspections (see chapter 7).
920
To Next Page
Loading...
Need help?
General
