[loidfast-151012-01.tif, 2, en_US]
Figure 7-60
Logic of the I-DIFF Fast Differential Protection Function
I-DIFF Unrestrained Differential Protection Function
In addition to the I-DIFF and I-DIFF fast differential protection function, the function I-DIFF unrestrained is
available. The main task of this function consists in switching off high-current internal short circuits in the
shortest amount of time. The method controls current-transformer saturation.
High-current faults in the protection range can always be switched off immediately without consideration of
the restraint currents if, due to the current magnitude, it is determined that an external fault is not involved. In
the case of protected objects with a large intrinsic longitudinal impedance (transformer, generator, reactor), a
current can be found that is never exceeded by a flowing short-circuit current.
Capacitor Bank Protection
7.8 Differential Protection for Capacitor Banks
SIPROTEC 5, Overcurrent Protection, Manual 1057
C53000-G5040-C017-8, Edition 07.2017
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