5. OPERATION 85
5.7. Gas monitoring with density sensors
The high voltage compartments must have a
sufficient insulating gas pressure during
operation (please see the table entitled
“Technical data” for the pressures). The density of
the SF
6
insulating gas is monitored during
operation by a density sensor (temperature-
compensated).
If the gas pressure falls below the level for a
warning signal, a signal indicating that the
insulating gas should be topped up is issued via
an LED on a bay control unit or via a warning lamp.
When a switchgear is isolated for a relatively long
period, the auxiliary power supply is to be
maintained in order to monitor the insulating gas
density.
5.8. Operation of the isolating device for voltage
transformers
The voltage transformers in the metering panel,
the optional voltage transformers in the 23.6 in
wide panel with outer cones and the voltage
transformers for the integrated metering system
with isolating device can be isolated manually
from the corresponding switchgear section.
Cross-sections of these panels showing the
positions of the controls can be found in fig. 5.8.1.
Hazard warning
The isolating devices in the metering
panel and in the panel with outer cones
may only be operated when the
switchgear section concerned is in the
off-circuit condition.
—
Fig. 5.8.1:
A
Position of the
controls for the
voltage transformer
isolating device
Metering panel Panel with outer cones
A AA
Integrated busbar metering system with
A A
—
Fig. 5.8.1.
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