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Figure 2.24 – Block diagram of the zero sequence voltage stages U
Table 3.25 – Parameters of the residual overvoltage stages U
Parameter
Value
Status
-
Blocked
Start
Trip
SCntr
TCntr
SetGrp
1 or 2
SGrpDI
-
DIx
VIx
LEDx
VOx
Force
Off
On
Uo
Uo>, Uo>>
t>, t>>
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
Recorded values of the latest eight faults
Detailed information is available on the eight latest faults: Time
stamp, fault voltage, elapsed delay and setting group.
Protection Functions
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.
%
The supervised value relative to Un/√3
%
Pick-up value relative to Un/√3
s
Definite operation time
3-45
> and U
>>
0
0
>, U
>> (59N)
0
0
Note
F
F
C
C
Set
Set
Set
Set
Set
857-UM001A-EN-P – July 2009
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