Areva WSB - Insulating Gas, Monitoring; General Data

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4.1 Technical data
Type of insulating gas:
Sulfur hexafluoride SF
6
according
to IEC 60376.
The tanks of the switchgear have
been designed as “Sealed Pressure
System“ as defined by the IEC publi-
cation 62271-200. Thanks to the
design of the “Sealed Pressure
System”, the insulating gas contents
do not require any maintenance.
During the expected service life, no
gas handling will be required under
normal operating conditions acc. to
IEC 60694.
For further details on this aspect,
also refer to the Technical Instruction
“Use and handling of insulating gas”
for WS panels, which is available on
request.
4 Insulating gas, monitoring
>>
Rated pressure and pickup values of pressure gauge / IGIS
Rated voltage [kV] 12/24 12/24 36 36
Rated
(normal) current [A] ≤1,250 >1,250 ≤1,250 >1,250
Rated pressure [MPa] 0.030 0.075 0.05 0.075
Pre-alarm in case of
a drop in pressure [MPa] 0.019 0.062 0.037 0.062
Main alarm in case of
a drop in pressure [MPa] 0.014 0.057 0.032 0.057
Important!
The switchgear-specific gas
compartment diagram must
be complied with.
Measures to be taken at the various warning thresholds
1)
Refer to the instructions for the “Use and handling of insulating gas“ for WS
2)
These values apply for an insulating gas temperature of 20 °C. The insulating properties may be impaired after a certain period due to penetrating
ambient air.
Warning threshold
Pre-alarm in case of a drop
in pressure
(signalling contact 1)
Main alarm in case of drop in
pressure (signalling contact 2)
Insulating gas pressure has
decreased to atmospheric
pressure
Maßnahmen
Replenish insulating gas
1)
Contact the manufacturer.
In case of a main alarm, isolate
the switchgear compartment in
question!
Contact the manufacturer.
Dielectric state of the gas compartment
The insulating level is not restricted up to
the warning threshold “main warning” and
corresponds to the data on the rating plate.
Reduced insulating level
Switchgear Insulating level
2)
rated voltage U
r
12 kV
Rated lightning impulse
withstand voltage 75 kV
17.5 kV
Rated lightning impulse
24 kV
withstand voltage 95 kV
36 kV
Rated lightning impulse
withstand voltage 145 kV