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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
(address
2625
) 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.