ABB REB650 - Two Step Undervoltage Protection UV2 PTUV (27)

Section 8 Voltage protection
8.1 Two step undervoltage protection UV2PTUV (27)
8.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Two step undervoltage protection UV2PTUV
2U<
SYMBOL-R-2U-GREATER-THAN
V1 EN
27
8.1.2 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.
8.1.3 Function block
ANSI09000285-1-en.vsd
UV2PTUV (27)
V3P*
BLOCK
BLK1
BLK2
TRIP
TRST1
TRST2
PICKUP
PU_ST1
PU_ST1_A
PU_ST1_B
PU_ST1_C
PU_ST2
ANSI09000285 V1 EN
Figure 50: UV2PTUV (27) function block
1MRK 505 277-UUS C Section 8
Voltage protection
123
Technical Manual