Siemens SIPROTEC 4 7SJ61 Manual page 51

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Figure 2-8
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Figure 2-9
If parameter MANUAL CLOSE is set to 50N-1 instant. and manual close detection applies, the trip is initi-
ated as soon as the pickup conditions arrive, even if the element is blocked via a binary input.
The same applies to 79 AR 50N-1 inst.
The pickup values of each 50-1, 50-2 element for the phase currents and 50N-1, 50N-2 element for the
ground current and the valid delay times for each element can be set individually.
The dropout delay only functions if no inrush was detected. An incoming inrush will reset a running dropout
time delay.
SIPROTEC 4, 7SJ61, Manual
C53000-G1140-C210-6, Edition 05.2016
Logic diagram of the dropout delay for 50-1
Logic diagram for the 50N-1 overcurrent current element
2.2 Overcurrent Protection 50, 51, 50N, 51N
Functions
51