Initial Inspections
3-12
7SA6 Manual
C53000-G1176-C156-2
3.4 Storage
If the device is to be stored, note:
SIPROTEC
®
4 devices and associated assemblies should be stored in dry and clean
rooms, with a maximum temperature range of –25° C to +55° C (–12° F to 131° F).
See Sub-section 10.1.7 under Technical Data. To avoid premature aging of the elec-
trolyte capacitors in the power supply, a temperature range of +10° C to +35° C (50° F
to 95° F), is recommended for storage.
The relative humidity must not lead to condensation or ice buildup.
After extended storage, the power supply of the device should be energized, approx-
imately every two years, for one or two days to regenerate the electrolytic capacitors
in the power supply. This procedure should also be done prior to the device being put
in service. Under extreme climatic conditions (tropics), pre-warming is achieved at the
same time, and condensation is prevented.
After long storage, power should not be applied until the device has been in the oper-
ating area for a minimum of two hours. This time period allows the device to attain tem-
perature equilibrium, and prevents dampness and condensation from occurring.
To save the energy of the buffer battery inside the device, the battery is switched off
automatically without auxiliary supply voltage after a time period of 1 to 2 days.
n
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