Siemens SIPROTEC 4 7UT6 Series Manual page 441

Frequency Influence referring to k · Ι
Frequency in range 0.9 ≤ f/f
Characteristic
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Figure 4-18
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
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
N
≤ 1.1
N
Trip time characteristic of thermal overload protection
1 % at f = 50/60 Hz
N
3 % at f = 16.7 Hz (only 7UT613/63x)
N
Technical Data
4.9 Thermal Overload Protection
441