ABB Relion 650 Series Technical Manual page 199

1MRK 506 326-UUS B
Function
Reset time, directional
residual over current
Critical impulse time non-
directional residual over
current
Impulse margin time non-
directional residual over
current
6.8 Time delayed 2-step undercurrent protection UC2PTUC
(37)
6.8.1 Identification
Function description
Time delayed 2-step undercurrent
protection
6.8.2 Functionality
Time delayed 2-step undercurrent protection (UC2PTUC, 37) function is used to supervise the line
for low current, for example, to detect a loss-of-load condition, which results in a current lower
than the normal load current.
6.8.3 Function block
I3P*
BLOCK
BLK1
BLK2
ANSI09000124 V1 EN-US
Figure 102: UC2PTUC (37) function block
Line distance protection REL650
Technical manual
Range or value
170 ms typically at 2 to 0.5 x I
100 ms typically at 0 to 2 x I
20 ms typically at 0 to 10 x I
25 ms typically
UC2PTUC (37)
TRIP
TRST1
TRST2
RI
PU_ST1
PU_ST2
ANSI09000124-1-en.vsd
© Copyright 2011 ABB Power Grids. All rights reserved
set
set
set
IEC 61850 IEC 60617
identification identification
UC2PTUC
3I<
2
IEC09000131 V2 EN-US
Current protection
Accuracy
-
-
-
-
GUID-30746FF2-94F5-42E1-96E1-3D3D1A1179EB v1
GUID-25D6FE6B-FB19-4883-ACD8-00F20C043465 v2
ANSI/IEEE C37.2
device number
37
GUID-4613FD06-ECD0-44ED-8D28-CA22F80495C2 v2
GUID-AD41BEC7-BDEE-4544-BAFB-681B9FB63F88 v2
Section 6
193