ABB REC650 ANSI - Two Step Undervoltage Protection UV2 PTUV (27)

Section 7 Voltage protection
7.1 Two step undervoltage protection UV2PTUV (27)
7.1.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Two step undervoltage protection UV2PTUV
3U<
SYMBOL-R-2U-GREATER-THAN
V2 EN
27
7.1.2 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.
UV2PTUV (27) has a high reset ratio to allow settings close to system service voltage.
7.1.3 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 68: UV2PTUV (27) function block
1MRK 511 287-UUS A Section 7
Voltage protection
167
Technical manual