Functions
2.11 Undervoltage and Overvoltage Protection (optional)
SIPROTEC, 7SD610, Manual
C53000-G1176-C145-6, Release date 02.2011
163
Figure 2-62 Logic diagram of the undervoltage protection for positive sequence voltage system
During single-pole dead time for automatic reclosure, the stages of positive sequence undervoltage protection
are automatically blocked. In this way, the stages do not respond to the reduced positive sequence voltage
caused by the disconnected phase in case the voltage transformers are located on the outgoing side.
2.11.3 Setting Notes
General
The voltage protection can only operate if, when configuring the device scope (address 137), it has been set
to Enabled. Compounding is only available if (address 137) is set to Enabl. w. comp..
The overvoltage and undervoltage stages can detect phase-to-earth voltages, phase-to-phase voltages or the
positive sequence voltages; for overvoltage also the negative sequence voltage, zero-sequence voltage or a
different single-phase voltage can be used. Any combination is possible. Stages that are not required are
switched OFF.
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