Siemens SIPROTEC 7XR81 Manual page 58

7XR87 Voltage Divider for Excitation Voltage
4.7 Environmental Conditions
4.7 Environmental Conditions
Temperatures
4.7.1
Type test, in operation
(in compliance with IEC 60068-2-1 and
IEC 60068-2-2, test Ad for 16 h and test Bd
Recommended for uninterrupted duty
(in compliance with IEC 60255-1)
Temperatures for continuous storage
Type test, transport and storage for 96 h
4.7.2 Humidity
Permissible humidity stress
(according to IEC 60068-2-30)
Constant humid heat, 56 days
Humid heat, cyclical
Other Environmental Information
4.7.3
Maximum altitude above sea level
Minimum admissible atmospheric pressure
58
-25 °C to +85 °C
-10 °C to +55 °C
-25 °C to +55 °C
-40 °C to +70 °C
≤ 75 % relative humidity on the annual average
Up to 93 % relative humidity
Devices subjected to condensation are not to be oper-
ated!
Arrange the devices so that they are not exposed to
direct sunlight or extreme temperature changes. This
will prevent condensation in the device.
40 °C, 93 % relative humidity
12 h + 12 h cycles
25 °C / 55 °C / 95 % relative humidity
2000 m (6561.68 ft)
783.8 hPa
SIPROTEC, Coupling Units for Generator Protection, Manual
C53000-H5040-C072-1, Edition 09.2018