Installation
128/214
Revision 06 • INSTALLATION AND OPERATING INSTRUCTIONS • 8DB10 • 864-5091.9
29
Tests
29.1
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 limit values adjusted on
the indicators are underflown or exceeded, 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
o
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.
DANGER
Operation with an incorrect SF
6
gas pressure can destroy parts of the switchgear.
➭ Do not put the switchgear into operation with too high or too low SF
6
gas pressures.