Installation Work With Sf6 Gas Before Commissioning; Completing Busbar Assembly And Filling With Sf6 Gas - Siemens 8DA10 Series Installation And Operating Instructions Manual

861-9601.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • Revision 11
22 Installation work with SF
If a rated short-duration power-frequency withstand voltage test has to be carried out on site,
the work with insulating sulfur hexafluoride gas (SF
performed in advance.
Danger of suffocation
Inhaling high concentrations of SF
SF gas is heavier than air. SF
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➭ Observe the safety data sheet for SF
➭ Do not enter confined spaces where SF
➭ Check and document reusability (dew-point, gas quality) before working with SF
➭ While working with SF
➭ After working with SF
special care.
22.1 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 on site. Each busbar run forms one gas compartment.
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Busbar runs within one transport unit that are already filled and closed hermetically at the
factory are not filled 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.
For equipping of busbar housing covers with desiccant bags, see page 47, "Overview of
busbar housing covers with desiccant bags".
In the ambient air, the desiccant bags lose their effectiveness rapidly
The formation of condensation can lead to corrosion of switchgear parts. High air
humidity can lead to creepage distances.
➭ If a gas compartment has been open for more than 30 minutes, replace all desiccant bags.
➭ Do not open the packing of the desiccant bags until right before putting them into the
panel.
➭ Use only desiccant bags whose packing is not damaged and whose humidity indicators in
the packing are blue.
➭ If the humidity indicators are pink, do not use the desiccant bags.
➭ If the desiccant bags have been exposed to the air for more than 30 minutes, do not use
the desiccant bags anymore.
➭ After opening the packings, mount the desiccant bags in the gas compartment within
30 minutes.
➭ Close the gas compartment hermetically with sealing rings (O-rings).
➭ Evacuate the gas compartment immediately.
➭ Remove all covers with the "Filter" inscription from the busbar housings of one busbar run.
➭ Clean busbar housings that are dirty inside with a hand vacuum cleaner.
The hand vacuum cleaner must feature a plastic tip.
➭ Clean the bushing plates with a cloth.
gas before commissioning
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WARNING
can cause death or serious injury.
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gas concentrates first near to the floor and in floor openings.
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gas.
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gas may accumulate.
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gas, provide for good ventilation.
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gas, vent the cable basement and any hollows in the floors with
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gas on site.
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WARNING
) described in this section must be
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gas
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Installation
gas.
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