Therefore, the settings are as follows:
• I
n
= 680 A
• T
max
= 90
̊
C
• T
amb
= 15
̊
C
• T
ref
= 15
̊
C
• τ = 183.8 min
• k
SF
= 0.81.
Figure. 5.3.21 - 169. Thermal image response with nominal currents and fine-tuned k
SF
correction factor.
When trying to load the cable with the nominal current one can see the actual current-carrying
capacity of the cable is much lower than in the presumptive conditions. A normal loading current can
now warm up the cable too much and threaten its withstandability. If the k
SF
had not been set, the
thermal image would show a temperature of appr. 68
̊
C instead of the real temperature of 96
̊
C.
A
AQ
Q-F215
-F215
Instruction manual
Version: 2.04
243