Functions
2.2 Overcurrent Protection 50, 51, 50N, 51N
SIPROTEC, 7SJ62/64, Manual
C53000-G1140-C207-2, Release date 01.2008
68
Figure 2-6 Logic diagram for the 50-1 current element for phases
The dropout delay only operates if no inrush was detected. An incoming inrush will reset a running dropout
delay time.
If parameter MANUAL CLOSE is set to 50 -1 instant. and manual close detection is used, a pickup causes
instantaneous tripping, even if blocking of the element via binary input is present. The same applies to 79AR
50-1 inst.
Figure 2-7 Logic diagram of the dropout delay for 50-1
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