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3-18
Protection Functions
Note: The longest delay
is limited to 1000 seconds
(=16min 40s).
857-UM001A-EN-P – July 2009
2000
1000
K = 2 %
500
2
200
100
50
K = 2 %
2
20
10
5
2
1
0
20
Negative sequence current I (%)
Figure 3.11 – Inverse operation delay of current unbalance stage I
Table 3.10 – Parameters of the current unbalance stage I
Parameter
Value
Status
-
Blocked
Start
Trip
SCntr
TCntr
SetGrp
1 or 2
SGrpDI
-
DIx
VIx
LEDx
VOx
Force
Off
On
I2/Imot
I2>
t>
Type
DT
INV
K1
For details of setting ranges see "Protection Stages" in Chapter 10.
Set = An editable parameter (password needed)
C = Can be cleared to zero
F = Editable when force flag is on
CurrentUnbalanceChar
K = 40 %
K = 70 %
2
K = 40 %
K = 70 %
2
2
40
60
2
Unit
Description
Current status of the stage
Cumulative start counter
Cumulative trip counter
Active setting group
Digital signal to select the active setting
group
None
Digital input
Virtual input
LED indicator signal
Virtual output
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.
%Imot
The supervised value.
%Imot
Pick-up setting
s
Definite operation time (Type=DT)
Definite time
Inverse time (Equation 3.1)
s
Delay multiplier (Type =INV)
2
K = 50 s
1
K = 1 s
1
80
100
>
2
> (46)
2
Note
F
F
C
C
Set
Set
Set
Set
Set
Set
Set
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