VAMP 259 - Page 104

2.14 Overvoltage protection U> (59)
2 Protection functions
Technical description
104
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Figure 2.14-1 shows the functional block diagram of the
overvoltage function stages U>, U>> and U>>>.
Figure 2.14-1 Block diagram of the three-phase overvoltage stages U>, U>>
and U>>>.
Parameters of the overvoltage stages U>, U>>, U>>> (59)
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
Umax
V
The supervised value. Max. of
U
L12
, U
L23
and U
L31
U>, U>>,
U>>>
V
Pick-up value scaled to
primary value
U>, U>>,
U>>>
%Un
Pick-up setting relative to U
N
Set
t>, t>>,
t>>>
s
Definite operation time
Set
RlsDly
s
Release delay (U> stage only)
Set
Hyster
3
(default)
%
Dead band size i.e. hysteresis
Set