861-9601.9 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DA10 • Revision 11
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Installation
28
Tests
28.1
Checking the SF
6
gas filling
Checking the gas pressure
Before commissioning or a rated short-duration power-frequency withstand voltage test,
the gas pressures of
all
gas compartments must be checked.
➭ On all gas compartments filled at site: After having filled the gas compartments,
observe a temperature compensation time of
24 hours
. Do not check the gas pressure
before that time.
➭ Check the gas pressure in all gas compartments filled at site. If the gas pressure is lower or
higher than the limit values adjusted on the indicators, correct the gas pressure.
Leakage test
➭
24 hours
after having filled the gas compartments, check all flange connections mounted at
site and all SF
6
pipes for leaks.
➭ For leak detection, use an SF
6
leak detector.
➭ In case of gas leaks, these points must be disassembled and sealed again.
Checking the gas quality
➭ Check the gas quality
24 hours
after filling the gas compartments.
➭ Determine the maximum dew point with a gas hygrometer.
Dew-point temperature:
-15 °C.
➭ Check the air content in the SF
6
gas with a gas-percentage meter.
Maximum air content: 5%
.
➭ If the gas quality is not achieved, the gas filling must be cleaned with the maintenance unit.
Monitoring the gas
pressure
➭ After commissioning, check the gas pressures daily for a period of two weeks. If the gas
pressures drop within this period of time, please inform the Siemens representative.
➭ After this period of time, check the gas pressures according to the maintenance instructions.
28.2
Monitoring the gas pressure
The perfect functioning of the switchgear is only guaranteed if the gas pressure indication of
the manometer is between the minimum and the maximum functional level (see page 35,
"Insulating gas").
CAUTION
Insufficient gas filling can cause injury or property damage.
Operating the switchgear without service readiness due to insufficient gas filling can
cause injury and the destruction of parts of the switchgear.
➭ Before performing any switching operation, check the gas pressure in the compartments
pre-filled at the factory on the associated gas pressure indicators. The values must not drop
below the temperature-dependent limit values.
➭ Do not install, commission or operate a switchgear with incorrect or too low SF
6
gas
pressures. If required, isolate the switchgear and put it out of service.
➭ Inform the competent regional Siemens representative.
CAUTION
Insufficient gas filling can cause injury or property damage.
Operating the switchgear without service readiness due to insufficient gas filling can
cause injury and the destruction of parts of the switchgear.
➭ Before performing any switching operation, check the gas pressure in the compartments
pre-filled at the factory on the associated gas pressure indicators. The values must not drop
below the temperature-dependent limit values.
➭ Do not install, commission or operate a switchgear with incorrect or too low SF
6
gas
pressures. If required, isolate the switchgear and put it out of service.
➭ Inform the competent regional Siemens representative.
