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2.6 Undervoltage protection U1<
(27P)
2 Protection functions
Technical description
58
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VM55.EN005
Setting groups
There are two settings groups available for both stages.
Switching between setting groups can be controlled by digital
inputs, virtual inputs (mimic display, communication, logic)
and manually.
Parameters of the under voltage stages U
1
<, U
1
<< (27P)
Parameter
Value
Unit
Description
Note
Status
-
Blocked
Start
Trip
Current status of the stage
F
F
SCntr
Cumulative start counter
C
TCntr
Cumulative trip counter
C
SetGrp
1 or 2
Active setting group
Set
SGrpDI
-
DIx
VIx
LEDx
VOx
Digital signal to select the
active setting group
None
Digital input
Virtual input
LED indicator signal
Virtual output
Set
Force
Off
On
Force flag for status forcing for
test purposes. This is a
common flag for all stages and
output relays, too.
Automatically reset by a 5-
minute timeout.
Set
U1
V
The supervised positive
sequence voltage in primary
volts
U1
%
The supervised positive
sequence voltage of Un/
3
U1<, U1<<
V
Pick-up value scaled to
primary value
U1<, U1<<
%
Pick-up setting of Un/
3
Set
t<, t<<
s
Definite operation time
Set
LVBlk
%Un
Low limit for self blocking.
This is a common setting for
both stages.
Set
For details of setting ranges see chapter 9.3.
Set = An editable parameter (password needed)
C = Can be cleared to zero
F = Editable when force flag is on
Recorded values of the latest eight faults
There are detailed information available of the eight latest
faults: Time stamp, fault voltage, elapsed delay and setting
group.
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