COMMISSIONING
50 / 146 OI 250 (EN) REV7 /REV6
7.2 Gas Piping
As an option, the circuit breaker may be equipped with a separate
density monitor for each pole. The respective operations must then
be carried out for each pole.
The rated pressure (ND) is shown on the nameplate and the den-
sity monitor (black dot on the density monitor indicator).
If there is any doubt about the gas quality, always check it (see
“Checking the Gas Quality” on Page 79).
Contamination of breaker gas by foreign gases is not permitted.
Make sure that the filling hose is filled with SF
6
before the filling
operation. In case of doubt, purge the filling hose before the filling
operation.
The density monitor indication can be checked using a test
manometer and a thermometer. The indicated value of the test
manometer must be corrected as a function of the ambient tem-
perature in accordance with the SF
6
pressure curve.
The pressurized components of the pole columns can be dama-
ged by improper handling. If the components are damaged, they
may burst when the gas pressure is increased. This can result in
serious personal injury or property damage.
Therefore:
- Inspect the pole columns visually for damage before be-
ginning the filling operation.
- Carry out the filling operation from a protected position.
If the rated pressure is exceeded, it may cause the pressure reli-
ef device to respond.
Therefore:
- Never set the pressure reducing valve of the gas-filling de-
vice higher than the rated breaker pressure.
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