Allen-Bradley Rockwell Automation 857 User Manual page 64

3-14
Protection Functions
857-UM001A-EN-P – July 2009
Table 3.5 – Parameters of the Directional Overcurrent Stages I
(cont.)
Parameter Value
ϕ
U1
A, B, C, D, E
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
Table 3.6 – Parameters of the directional overcurrent stages I
Parameter Value
Status -
Blocked
Start
Trip
SCntr
TCntr
SetGrp 1 or 2
SgrpDI
-
Dix
Vix
LEDx
Vox
Force Off
On
ILmax
Iϕ>>>>
Iϕ>>>>>
Iϕ>>>>
Iϕ>>>>>
t>>>
t>>>>
Mode Dir
Undir
Offset
ϕ
U1
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
Unit Description
° Measured power angle
%Un Measured positive sequence voltage
User's constants for standard equations.
Type=Parameters. See "Inverse Time
Operation".
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.
A The supervised value. Max. of IL1, IL2
and IL3
A Pick-up value scaled to primary value
xImode Pick-up setting
s Definite operation time (for definite time
only)
Directional (67)
Undirectional (50/51)
Angle offset in degrees
°
° Measured power angle
%Un Measured positive sequence voltage
>, I >> (67)
dir dir
Note
Set
>>>, I >>>> (67)
dir dir
Note
F
F
C
C
Set
Set
Set
Set
Set
Set
Set