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ABB
Transformer protection RET650
Product version: 1.1
Table 14. Environmental conditions
Description
Operating temperature range
Short-time service temperature range
Relative humidity
Atmospheric pressure
Altitude
Transport and storage temperature range
Table 15. Environmental tests
Description
Cold tests
operation
storage
Dry heat tests operation
storage
Damp heat
steady state
tests
cyclic
Value
-25...+55ºC (continuous)
-40...+70ºC (<16h)
Note: Degradation in MTBF and HMI
performance outside the temperature range
of -25...+55ºC
<93%, non-condensing
86...106 kPa
up to 2000 m
-40...+85ºC
Type test value
96 h at -25ºC
16 h at -40ºC
96 h at -40ºC
16 h at +70ºC
96 h at +85ºC
240 h at +40ºC
humidity 93%
6 cycles at +25 to +55ºC
humidity 93...95%
1MRK 504 127-BEN -
Issued: February 2011
Reference
IEC 60068-2-1
IEC 60068-2-2
IEC 60068-2-78
IEC 60068-2-30
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