tion will be defeated until the time interval has lapsed. This binary input only affects the trip command. There
is no effect on fault recording, nor does the thermal replica reset.
[logikdia-thermischen-ueberlastschutz-121102-st, 1, en_GB]
Figure 2-100
Logic diagram of the thermal overload protection (simplified)
Overload protection using a thermal replica with ambient temperature
influence
Prinzip
The calculation basis is based on those of the overload protection, according to Section 2.9.2 Overload Protec-
tion Using a Thermal Replica, the ambient temperature, usually the coolant temperature, is however taken
into consideration.
The ambient or coolant temperature has to be measured with a temperature detector in the protected object.
The user can install up to 12 temperature measuring points in the protected object. Via one or two RTD boxes
and a serial data connection the measuring points inform the overload protection of the 7UT6x about the local
coolant temperature. One of these points is selected and relevant for the temperature calculation in the over-
load protection.
2.9.3
Functions
2.9 Thermal Overload Protection
202 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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