Technical Data
4.1 General Device Data
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
343
4.1.7 Climatic Stress Tests
Temperatures
Humidity
4.1.8 Service conditions
Standards: IEC 60255-6
Type test (in acc. with IEC 60068-2-1 and -2, Test
Bd for 16 h)
–25 °C to +85 °C or –13 °F to +185 °F
Permissible temporary operating temperature
(tested for 96 h)
–20 °C to +70 °C or –4 °F to +158 °F (clearness of the
display may be impaired from +55 °C or +131 °F)
Recommended for permanent operation (in acc.
with IEC 60255-6)
–5 °C to +55 °C or +23 °F to +131 °F
Limit temperatures for storage –25 °C to +55 °C or –13 °F to +131 °F
Limit temperatures for transport –25 °C to +70 °C or –13 °F to +158 °F
Storage and transport with factory packaging
Permissible humidity Mean value per year ≤ 75 % relative humidity;
on 56 days of the year up to 93 % relative humidity; con-
densation must be avoided!
Siemens recommends that all devices be installed such that they are not exposed to direct sunlight, nor
subject to large fluctuations in temperature that may cause condensation to occur.
The protection device is designed for installation in normal relay rooms and plants so that electromagnetic
compatibility (EMC) is ensured if installation is done properly.
We also recommend:
• All contacts and relays that operate in the same cubicle, cabinet, or relay panel as the numerical protective
device should always be equipped with proper surge suppression components.
• For substations with operating voltages of 100 kV and higher, all external cables should be shielded with a
conductive shield grounded at both ends. No special measures are normally required in a medium-voltage
substation.
• Do not withdraw or insert individual modules or boards while the protective device is energized. When han-
dling modules outside the case, the standards for components sensitive to electrostatic discharge (Electro-
statically Sensitive Devices) must be observed. They are not endangered inside the case.
• Only temperature sensors with 3-wire connection and shielded connection cables may be connected.
Connect the cable shield as short as possible at the terminal D-14 designed for this purpose.
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