Functions
2.19 Undervoltage and Overvoltage Protection (optional)
SIPROTEC, 7SD5, Manual
C53000-G1176-C169-5, Release date 02.2011
367
Figure 2-176 Logic diagram of the overvoltage protection for zero sequence voltage
Freely selectable single-phase voltage
As the zero-sequence voltage stages operate separately and independently of the other protection overvoltage
functions, they can be used for any other single-phase voltage. Therefore the fourth voltage input U
4
of the
device must be assigned accordingly (also see Section 2.1.2, „Voltage Transformer Connection“).
The stages can be blocked via a binary input „>3U0>(>) BLK“. Internal blocking is not accomplished in this
application case.
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