Two Step Undervoltage Protection Uv2Ptuv (27) - ABB Relion Technical Manual

1MRK 502 048-UUS A
Section 9
9.1
9.1.1
9.1.2
9.1.3
Technical manual
Voltage protection

Two step undervoltage protection UV2PTUV (27)

Identification
Function description
Two step undervoltage protection
Functionality
Undervoltages can occur in the power system during faults or abnormal conditions. Two
step undervoltage protection (UV2PTUV, 27) function can be used to open circuit
breakers to prepare for system restoration at power outages or as long-time delayed back-
up to primary protection.
UV2PTUV (27) has two voltage steps, where step 1 is settable as inverse or definite time
delayed. Step 2 is always definite time delayed.
UV2PTUV (27) has a high reset ratio to allow settings close to system service voltage.
Function block
UV2PTUV (27)
V3P* TRIP
BLOCK TRST1
BLK1 TRST2
BLK2 PICKUP
PU_ST1
PU_ST1_A
PU_ST1_B
PU_ST1_C
PU_ST2
ANSI09000285-1-en.vsd
ANSI09000285 V1 EN
Figure 130: UV2PTUV (27) function block
IEC 61850 IEC 60617
identification identification
UV2PTUV
3U<
SYMBOL-R-2U-GREATER-THAN
V2 EN
Section 9
Voltage protection
ANSI/IEEE C37.2
device number
27
281