Functions
2.2 Overcurrent Protection 50, 51, 50N, 51N
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
69
Figure 2-8 Logic diagram for the 50N-1 current element
If parameter MANUAL CLOSE is set to 50N-1 instant. and manual close detection applies, the trip is initiated
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.
Figure 2-9 Logic of the dropout delay for 50N-1
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