The IEC offers several definitions of thermal equilibrium in
its Glossary.
thermal equilibrium conditions
stable temperature conditions indicated by temperature
changes of no more than 3 K (5 °F) or 1 % of the absolute
operating temperature, whichever is higher between two
readings 15 min apart
IEC 62282-2, ed. 1.0 (2004-07)
thermal equilibrium
variation of less than 1 K between any two out of three
consecutive measurements made at an interval of 5 min
IEC 61810-7, ed. 2.0 (2006-03)
thermal equilibrium
state reached when the observed temperature rise of any part
of the welding equipment does not exceed 2 K/h
IEC 62135-1, ed. 1.0 (2008-07)
thermal equilibrium
the state reached when the temperature rises of the several
parts of the machine do not vary by more than a gradient of
2 K per hour
NOTE Thermal equilibrium may be determined from the
time-temperature rise plot when the straight lines between
points at the beginning and end of two successive reasonable
intervals each have a gradient of less than 2 K per hour.
IEC 60034-1, ed. 12.0 (2010-02)
Nice to see a harmonised approach from the various IEC TCs
Regards
Mick
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