[logikdia-schieflastschutzes-bsp-iec-kennlinie, 1, en_GB]
Figure 2-96
Logic diagram of the unbalanced load protection - illustrated for IEC characteristic
Thermal Stage
With the aid of the thermal stages the unbalanced load protection can be well adapted to the thermal loading
of the electrical motor rotor during asymmetric load.
Pickup, Warning
The permissible continuous load imbalance is determined with the setting I2>. If this value is exceeded, it
applies as “Pickup” for the negative sequence protection. At the same time this sets the alarm stage: After a set
time T WARN has expired, a warning message
I2 th. Warn
is given.
Thermal Characteristic
The thermal characteristic allows an approximate calculation of the thermal loading of the electrical motor
rotor by load imbalance in the stator. This follows the simplified equation:
[thermische-kennlinie, 1, en_GB]
Functions
2.8 Unbalanced Load Protection
190 SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
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