ABB Relion 650 Series Technical Manual page 239

1MRK 506 326-UUS B
Section 7
7.1 Two step undervoltage protection UV2PTUV (27)
7.1.1 Identification
Function description
Two step undervoltage protection
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.
7.1.3 Function block
V3P*
BLOCK
BLK1
BLK2
ANSI09000285 V1 EN-US
Figure 121: UV2PTUV (27) function block
Line distance protection REL650
Technical manual
Voltage protection
UV2PTUV (27)
TRIP
TRST1
TRST2
PICKUP
PU_ST1
PU_ST1_A
PU_ST1_B
PU_ST1_C
PU_ST2
ANSI09000285-1-en.vsd
© Copyright 2011 ABB Power Grids. All rights reserved
IEC 61850 IEC 60617
identification identification
UV2PTUV
2U<
V1 EN-US SYMBOL-R-2U-GREATER-THAN
Voltage protection
GUID-2337BCF0-1F7E-461A-9EB8-954E2DD25D74 v1
ANSI/IEEE C37.2
device number
27
Section 7
M16876-1 v4
M13789-3 v7
M13794-3 v5
233