2.11 Undervoltage and Overvoltage Protection (optional)
157
7SD610 Manual
C53000-G1176-C145-4
Figure 2-57 Logic diagram of the overvoltage protection for zero sequence voltage
Freely selectable
single-phase
voltage
As the zero sequence voltage stages operate separately and independent from the
other protective 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 accord-
ingly (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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