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Table 3.21 – Parameters of the directional intermittent transient earth fault stage I
(67NT)
Parameter
Value
Status
-
Blocked
Start
Trip
SCntr
TCntr
SetGrp
1 or 2
SGrpDI
-
DIx
VIx
LEDx
VOx
Force
Off
On
Io1
Io2
Uo
Uo>
t>
Io input
Io1Peak
Io2Peak
Intrmt
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
There is detailed information available of the eight latest detected
faults: Time stamp, U
0
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 after a five minute
timeout.
pu
The detected I
value according the
0
parameter "Input" below.
%
The measured U
0
U
= 100 %
0N
%
U
pick up level. U
0
s
Operation time. Actually the number
of cycles including faults x 20 ms.
When the time between faults
exceeds 20 ms, the actual operation
time will be longer.
I
Connectors X1-7&8
01
I
Connectors X1-9&10
02
s
Intermittent time. When the next fault
occurs within this time, the delay
counting continues from the previous
value.
voltage, elapsed delay and setting group.
3-39
>
0T
Note
F
F
Clr
Clr
Set
Set
Set
value.
= 100 %
Set
0N
Set
Set
Set
857-UM001A-EN-P – July 2009
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