Technical description
2 Protection functions
2.7 Current unbalance stage I2> (46)
VM50.EN004
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57
0
1
10
100
1000
2
20
200
2000
5
50
500
20
Negative sequence current I (%)
2
CurrentUnbalanceChar
Operation
time
(s)
40
60
80
100
K = 1 s
1
K = 50 s
1
K = 2 %
2
K = 2 %
2
K = 40 %
2
K = 40 %
2
K = 70 %
2
K = 70 %
2
Figure 2.7-1. Inverse operation delay of current unbalance stage I
2
>. The
longest delay is limited to 1000 seconds (=16min 40s).
Parameters of the current unbalance stage I
2
> (46)
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
I2/Imot
%Imot The supervised value.
I2> %Imot
Pick-up
setting
Set
t> s
Definite operation time
(Type=DT)
Set
Type DT
INV
Definite
time
Inverse time (Equation 2.7-1)
Set
K1
s
Delay multiplier (Type =INV)
Set
