Quency Voltage Test; Installing Solid-Insulated Bars At The Panel Connec- Tion, And Filling The Circuit-Breaker Housings With Sf6-Gas - Siemens 8DA Installation Instructions Manual

fåëí~ää~íáçå
Mounting solid-insulated
bars
38
10 Installation work with SF
age test
If a rated short-duration power-frequency withstand voltage test has to be performed at
site, the work with sulphur hexafluoride gas (SF
performed after the test.
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
10.1 Installing solid-insulated bars at the panel connection, and filling the circuit-breaker
housings with SF -gas
6
When solid-insulated bars are installed, the circuit-breaker housings are ventilated. The
circuit-breaker housings are already equipped with desiccant bags for eliminating the
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 work
operations are performed completely for one bar connection on one panel.
ATTENTION!
Desiccant bags that have been fitted in the circuit-breaker housings at the factory are
not effective anymore if the housings remain open for more than half an hour.
!
Replace desiccant bags in circuit-breaker housings that have been open for more
than half an hour.
!
Remove provisional cover from one of the circuit-breaker housings.
!
Write down the beginning of the ventilation time of the circuit-breaker housing.
!
Prepare the flange of the solid-insulated bar and the connection flange of the circuit-
breaker housing for assembly (see Section "Preparing the flanges of the busbar
housings", Page 24).
!
Bolt the solid-insulated bar tight using bolts
d
washers . Tightening torque: 20 Nm.
!
If the circuit-breaker housing was ventilated for more than half an hour, replace the
desiccant bags (see Page 34, "Assembling panel connections supplied separately
and filling circuit-breaker housings with SF
!
Evacuate the circuit-breaker housings and fill with SF
"Assembling panel connections supplied separately and filling circuit-breaker
housings with SF -gas").
6
!
Repeat the above work operations for all other panel connections in the same panel.
-gas after the power-frequency volt-
6
) described in this section must be
6
-gas, provide for sufficient ventilation.
6
-gas, vent the cable basement and any hollows in the floors
6
-gas.
6
a
, contact washers
-gas").
6
oÉîáëáçå=MP=G=fkpq^iiqflk=fkpqor`qflkp=Ua^=G=USNJVOTPKV=
s
and plain
-gas (see Page 34,
6