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5 Operation
5 Operation
5.1 Instructions for Operation
5.1.1 Closing and Opening
WARNING
Danger of serious mechanical damage!
An SF
6
-minimum gas pressure (SF
6
-blocking pressure) must be available for test operations (without
current and voltage).
WARNING
Danger! - High voltage!
A circuit-breaker connected to high voltage may only be operated conforming with the safety
regulations of the facility. In this case, the general lockouts of the circuit-breaker may not be
bypassed.
Switching operations triggered directly at the tripping coil will bypass both the switchgear interlock and
general lockouts of the circuit-breaker.
5.1.2 SF
6
Pressure
The pressure of the SF
6
gas in the pole columns is monitored by a density monitor and shown on the respective
pressure gauge. The response values of the density monitor are shown, see 3.1.6 Arc Quenching Medium SF
6
.
If the SF
6
pressure drops unduly low, a signal Loss of SF
6
is initiated. The circuit-breaker must then be topped up
as soon as possible with SF
6
from a gas cylinder or using the filling device connected to the flange W1 on the gas
monitoring unit until nominal pressure is restored. The circuit-breaker must be isolated for this. When filling has
been completed, the circuit-breaker can be put back into operations.
WARNING
The circuit-breaker must be switched off and earthed for SF
6
filling work.
The circuit-breaker can be switched back on when filling is complete and the earthing has been
disconnected.
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