Section 8 Voltage Protection; Two Step Undervoltage Protection Uv2Ptuv (27); Identification; Setting Guidelines - ABB REB670 Applications Manual

1MRK 505 337-UUS -
Section 8
8.1
8.1.1
8.1.2
8.1.2.1
Application manual
Voltage protection

Two step undervoltage protection UV2PTUV (27)

Identification

Function description
Two step undervoltage protection

Setting guidelines

All the voltage conditions in the system where UV2PTUV (27) 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 settings base voltage
VBase, 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 setting for UV2PTUV (27) is normally not critical, since there must be enough time
available for the main protection to clear short circuits andground faults.
Some applications and related setting guidelines for the voltage level are described in the
following sections.

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.
IEC 61850 IEC 60617
identification identification
UV2PTUV
3U<
SYMBOL-R-2U-GREATER-THAN
V2 EN
Section 8
Voltage protection
ANSI/IEEE C37.2
device number
27
231