Installation Work With Sf6 Gas After The Power-Frequency Voltage Test; Installing Solid-Insulated Bars At The Panel Connection, And Filling The Circuit-Breaker Housings With Sf6 Gas - Siemens 8DB10 Installation And Operating Instructions Manual

Mounting
solid-insulated bars
864-5091.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • Revision 06
25 Installation work with SF
frequency voltage test
If a rated short-duration power-frequency withstand voltage test has to be carried out at site,
the work with sulphur hexafluoride gas (SF
after the test.
DANGER
Danger of suffocation! SF
floor openings.
➭ Do not let SF gas get into the environment.
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➭ While working with SF
➭ After working with SF
special care.
➭ Observe the safety data sheet for SF
25.1 Installing solid-insulated bars at the panel connection,
and filling the circuit-breaker housings with SF
When solid-insulated bars are installed, the circuit-breaker housings are ventilated. The circuit-
breaker housings are already equipped with desiccant bags at the factory in order to eliminate
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.
➭ Mount solid-insulated bar. Tightening torque at the flange: 20 Nm.
➭ If the circuit-breaker housing was ventilated for more than half an hour, replace the
desiccant bags (see page 87, "Installing the panel connections supplied in the accessories,
and filling the circuit-breaker housing with SF
➭ Evacuate the circuit-breaker housings and fill with SF
(see page 87, "Installing the panel connections supplied in the accessories, and filling the
circuit-breaker housing with SF
➭ Repeat the above work operations for all other panel connections in the same panel.
gas after the power-
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) described in this section must be performed
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gas is heavier than air and concentrates first near to the floor and in
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gas, provide for sufficient ventilation.
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gas, vent the cable basement and any hollows in the floors with
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gas.
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gas").
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gas").
6
gas
6
gas
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Installation
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