Operate Curve
Operate curve
Where t Operate time
τ
th
Time constant
I Current load current
I
preload
Preload current
k Setting factor according to VDE 0435 part 3011 or
IEC 60255-149 (K factor)
I
rated, obj
Rated current of the protected object
Technical Data
11.31 Thermal Overload Protection, 3-Phase – Advanced
1192 SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-A, Edition 05.2018
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