Functions
2.2 Overcurrent Protection 50, 51, 50N, 51N
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
65
Figure 2-10 Logic diagram of the 50N-1 element
If parameter 1313 MANUAL CLOSE is set to 50N-1 instant. and manual close detection is used, a pickup
causes instantaneous tripping even if the Element is blocked via a binary input.
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 2-11 Logic of the dropout delay for 50N-1
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