Rockwell Automation 865 Differential Protection Relay - Manual (Page 65)

Protection Functions 3-21
865-UM001A-EN-P – July 2009
Table 3.12 – Parameters of the Undirectional Earth Fault Stage I 0 >>, I 0 >>>,
I 0 >>>> (50N/51N)
Parameter Value Unit Description Note
Status -
Blocked
Start
Trip
Current status of the stage
F
F
TripTime s Estimated time to trip
SCntr Cumulative start counter Clr
TCntr Cumulative trip counter Clr
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
Io
Io2
IoCalc pu The supervised value according the
parameter "Input" below.
Io>>
Io>>>
Io>>>> A Pick-up value scaled to primary value
Io>>
Io>>>
Io>>>> pu Pick-up setting relative to the parameter
"Input" and the corresponding CT value Set
t> s Definite operation time (for definite time
only) Set
Input Io1
Io2
IoCalc
I’oCalc
X1-7&8. See Chapter 4.
X1-9&10
IL1 + IL2 + IL3
I’L1 + I’L2 + I’L3
Set
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