Sioning; Completing Busbar Assembly And Filling With Sf6; Gas - Siemens 8DA Installation Instructions Manual

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Earthing the panels
30
!
Undo right-hand bolt at the joint
into horizontal position.
!
Bolt the earthing busbar section
transport unit using 2 bolts. Tightening torque: 70 Nm.
!
Refit the removed bolt at the joint
Tightening torque: 70 Nm.
!
Proceed in the same way with all other transport units until all earthing busbar ends
of the switchgear are interconnected.
!
Connect the earthing busbar to the station earth.
Recommendation:In case of panel groups, earth the end panels and every fifth
panel at least.
8 Installation work with SF
If a rated short-duration power-frequency withstand voltage test has to be carried out at
site, the work with insulating sulphur hexafluoride gas (SF
must be performed in advance.
DANGER!
SF -gas is heavier than air and concentrates first near to the floor and in floor openings.
6
Danger of suffocation!
!
Do not let SF -gas get into the environment.
6
!
While working with SF
!
After working with SF
with special care.
!
Observe the safety data sheet for SF
8.1 Completing busbar assembly and filling with SF
The individual phases and sections of the busbar (called busbar runs hereafter) must be
filled with SF -gas at site. Each busbar run forms one gas compartment.
6
Busbar runs within one transport unit that are already filled and closed hermetically at
the factory are not refilled with SF
All parts of the switchgear that have to be filled with gas are equipped with desiccant
bags in order to eliminate residual humidity in the gas filling. In ambient air, the desiccant
agent loses its effectiveness rapidly.
To expose the desiccant bags as briefly as possible to the ambient air, the following
installation and gas work is performed completely on one busbar run, and is then
continued on the next busbar run, etc.
s
and fold the earthing busbar section
a
together with the earthing busbar of the next
s
and tighten the two bolts at the joint.
-gas before commissioning
6
-gas, provide for sufficient ventilation.
6
-gas, vent the cable basement and any hollows in the floors
6

-gas.

6
6
-gas at site.
6
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) described in this section
6
-gas
a
to the left