Frequency Influence referring to k · Ι
N
Frequency in range 0.9 ≤ f/f
N
≤ 1.1 1 % at f
N
= 50/60 Hz
3 % at f
N
= 16.7 Hz (only 7UT613/63x)
Characteristic
[ausloesekennlinie-ueberlast-170502-wlk, 1, en_GB]
Figure 4-18
Trip time characteristic of thermal overload protection
t Tripping time
τ Thermal time constant
I Load current
Ipre Previous load current
k Setting factor according to IEC 60255-8
IN Rated current of protected object
Technical Data
4.9 Thermal Overload Protection
SIPROTEC 4, 7UT6x, Manual 441
C53000-G1176-C230-5, Edition 09.2016
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