In many cases, UV2PTUV is a useful function in circuits for local or remote
automation processes in the power system.
10.1.3 Setting guidelines
All the voltage conditions in the system where UV2PTUV performs its functions
should be considered. The same also applies to the associated equipment, its voltage
and time characteristic.
There is a very wide application area where general undervoltage functions are used.
All voltage-related settings are made as a percentage of the global base value UBase,
which normally is set to the primary rated voltage level (phase-to-phase) of the power
system or the high voltage equipment under consideration.
The trip time setting for UV2PTUV is normally not critical, since there must be
enough time available for the main protection to clear short circuits and earth faults.
Some applications and related setting guidelines for the voltage level are described in
the following sections.
10.1.3.1 Equipment protection, such as for motors and generators
The setting must be below the lowest occurring "normal" voltage and above the lowest
acceptable voltage for the equipment.
10.1.3.2 Disconnected equipment detection
The setting must be below the lowest occurring "normal" voltage and above the
highest occurring voltage, caused by inductive or capacitive coupling, when the
equipment is disconnected.
10.1.3.3 Power supply quality
The setting must be below the lowest occurring "normal" voltage and above the lowest
acceptable voltage, due to regulation, good practice or other agreements.
10.1.3.4 Voltage instability mitigation
This setting is very much dependent on the power system characteristics, and
thorough studies have to be made to find the suitable levels.
10.1.3.5 Backup protection for power system faults
The setting must be below the lowest occurring "normal" voltage and above the
highest occurring voltage during the fault conditions under consideration.
Section 10 1MRK 502 071-UEN -
Voltage protection
404 Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Application manual
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