Siemens SIPROTEC 4 7UT6 Series Manual page 99

[anregung-des-differentialschutzes-020827-ho, 1, en_GB]
Figure 2-24
If restraint by higher-order harmonics is activated, the system first performs a harmonic analysis (approx. 1
cycle) to check the restraint conditions as the case may be. Otherwise, tripping occurs as soon as the tripping
conditions are fulfilled.
For special cases, the trip command can be delayed. The following logic diagram illustrates the tripping logic.
dar.
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
Pickup of the Differential Protection
Functions
2.2 Differential Protection
99