ABB RET615 - Page 30

Table 20. Environmental conditions
Description Value
Operating temperature range -25...+55ºC (continuous)
Short-time service temperature range
-40...+85ºC (<16h)
1)2)
Relative humidity <93%, non-condensing
Atmospheric pressure 86...106 kPa
Altitude Up to 2000 m
Transport and storage temperature range -40...+85ºC
1) Degradation in MTBF and HMI performance outside the temperature range of -25...+55 ºC
2) For IEDs with an LC communication interface the maximum operating temperature is +70 ºC
Table 21. Environmental tests
Description Type test value Reference
Dry heat test • 96 h at +55ºC
•
16 h at +85ºC
1)
IEC 60068-2-2
Dry cold test • 96 h at -25ºC
• 16 h at -40ºC
IEC 60068-2-1
Damp heat test • 6 cycles (12 h + 12 h) at +25°C…
+55°C, humidity >93%
IEC 60068-2-30
Change of temperature test • 5 cycles (3 h + 3 h)
at -25°C...+55°C
IEC60068-2-14
Storage test • 96 h at -40ºC
• 96 h at +85ºC
IEC 60068-2-1
IEC 60068-2-2
1)
For IEDs with an LC communication interface the maximum operating temperature is +70
o
C
Transformer Protection and Control 1MRS756891 F
RET615
Product version: 4.0
30 ABB