Operation; Operating Conditions - ABB SafeRing 36 Installation And Operating Instructions Manual

5. OPERATION

5.1 OPERATING CONDITIONS

Normal ambient conditions
SafeRing / SafePlus is generally equipped for operation/
service in normal indoor conditions in accordance with
IEC 62271-1.
The following limitations apply:
Ambient temperature
Max. temperature
Max. temperature (24-hour average)
Min. temperature
Humidity
Max. average relative humidity
measured over 24 hours
Max. average relative humidity
measured over 1 month
Altitude
Max height above sea level for installation without reducing
gas pressure is 1500 metres. In the interval from 1500 to
2500 meters, gas pressure has to be reduced according to
figure on previous page. For installation above 2500 meters,
please contact ABB for instructions.
Special conditions
In accordance with IEC 62271-1, the manufacturer and end-
user must agree about special operating conditions which
deviate from operation under normal conditions.
The manufacturer/supplier must be consulted in advance if
especially difficult operating conditions are involved. When
SafeRing/SafePlus is installed more than 1500 metres above
sea level, the atmospheric pressure will be lower and the
overpressure inside the tank will have to be reduced.
Airfreight
Units / modules transported by airfreight are delivered with
reduced overpressure. For topping up, please see procedure
for topping up of SF gas.
6
Application of the X-ray regulations
One of the physical properties of vacuum insulation is the
possibility of X-ray emissions when the contact gap is open.
The specified type test performed by the Physikalisch-
Technische Bundesanstalt (PTB) in Brunswick demonstrates
that the local dosage output of 1 µSv/h at a distance of 10 cm
from the touchable surface is not exceeded.
The results are as follows:
− The use of the vacuum interrupters at rated operation
+40°C voltage is completely safe.
− The above requirement is also fulfilled on application of the
+35°C
- 25°C rated power frequency withstand voltage specified for the
switching device by DIN VDE 0670 and IEC 60056 or a DC
voltage of 48 or 70 kV during cable tests.
− Higher voltages than the rated power frequency withstand
95% voltage specified in DIN VDE or IEC standards or the DC
test voltage should not be applied!
− Fulfillment of the above requirement with the vacuum inter-
90%
rupter in the open position is dependent on maintenance
of the specified distance between the contacts (which is
automatically ensured with correct mechanism function and
force transmission).
Installation and operating instruction | SafeRing/SafePlus 36kV 15