Functions
2.4 Backup Overcurrent
SIPROTEC, 7SD80, Manual
E50417-G1140-C474-A1, Release date 09.2011
79
The binary input „>5X-B InstTRIP“ and the evaluation of the indication „switch“ (onto fault) are common to
all elements. They may, however, separately affect the phase and/or ground current elements.
Parameter 50-B1 DELAY (address 2618) determines whether a non-delayed trip of this element via binary
input „>5X-B InstTRIP“ is possible (YES) or impossible (NO). This parameter is also used for fast tripping
before reclosing
If parameter 50-B2 Inrush (address2625) is set to YES, the element is blocked.
Figure 2-26 Logic diagram of the 50-1 element
Definite Time Overcurrent Element 50-2
The logic of the overcurrent elements 50-2 is the same as the logic of the 50-1 elements described above. In all
names, -1 has to be replaced by -2. The parameter names of the 50-2 elements are listed in section 2.4.4.
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