[lo_Stage Control, 1, en_US]
Figure 7-189
Logic Diagram of the Stage Control
RMS-Value Selection
The protection function supports 2 kinds of RMS measurement:
•
Normal RMS value
•
Gained RMS value from the function block Filter
The gained RMS value is automatically used if the function block Filter is configured and the filter has been
enabled.
i
i
NOTE
When the function block Filter is applied, only one current measuring point I-3ph is allowed to be
connected to the 3-phase current interface of the function group.
Thermal Replica
The protection function calculates the overtemperature from the phase currents based on a thermal single-
body model according to the thermal differential equation with
[fo_diffgl-170914, 2, en_US]
With the following standardization:
[fo_normie-170914, 3, en_US]
Θ
Current overtemperature, in relation to the final temperature at a maximum permis-
sible phase current k I
rated, obj
Θ
Amb
Standardized ambient temperature, where
ϑ
Amb
describes the coupled ambient temper-
ature. The coupled ambient temperature
ϑ
Amb
can be the measured ambient tempera-
ture or the ambient temperature preset using the
Default temperature
param-
eter.
Δ
ϑ
rated obj
Overtemperature of the protected object set at rated current
τ
th
Thermal time constant (temperature rise/cooling) of the protected object
Protection and Automation Functions
7.26 Thermal Overload Protection, 3-Phase - Advanced
882
SIPROTEC 5, High-Voltage Bay Controller, Manual
C53000-G5040-C015-9, Edition 11.2017
Summary of Contents for 6MD85
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