Siemens SIPROTEC 4 7UT6 Series Manual page 410

Technical Data
4.2 Differential Protection
[tdstabilisierung-zweiteharmo-7ut612-021026-rei, 1, en_GB]
Figure 4-2
Idiff Differential current = |Ι
INObj Rated current of protected object
IfN Current at rated frequency
I2f Current at double frequency
[tdstabilisierung-nteharmo-7ut612-021026-rei, 1, en_GB]
Figure 4-3
Idiff Ddifferential current = |Ι
INObj Nominal current of protected object
410
Restraining influence of 2nd harmonic in transformer differential protection
+ Ι |
1 2
Restraining influence of n-th harmonic in transformer differential protection
+ Ι |
1 2
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016