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In fact, the cold curve is simply a special case of the hot curve where prior load current I
the situation where a cold system is switched on to an immediate overload.
Figure P-3 shows a typical thermal profile for a system which initially carries normal load current, and is
then subjected to an overload condition until a trip results, before finally cooling to ambient temperature.
θ
(%)
100%
Overload Current
Condition
Normal Load
Current Condition
t (s)
Figure P-3
438
6 F 2 S 0 8 5 0
= 0, catering for
P
Trip at 100%
Cooling Curve
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