Allen-Bradley Rockwell Automation 857 User Manual page 83

Table 3.18 – Parameters of the Undirectional Earth Fault Stage I
(cont.)
Parameter Value
Io
Io2
IoCalc
IoPeak
Io2Peak
I'oCalc
Io>
Io>
Curve
DT
IEC
IEEE
IEEE2
RI
PrgN
Type
DT
NI
VI
EI
LTI
Parameters
t>
k>
Input Io1
Io2
IoCalc
Io1Peak
Io2Peak
I'oCalc
Intrmt
Dly20x
Dly4x
Dly2x
Dly1x
A, B, C,
D, E
For details of setting ranges see Chapter 9.
Set = An editable parameter (password needed)
C = Can be cleared to zero
F = Editable when force flag is on
Protection Functions
Unit Description
pu The supervised value according the
parameter "Input" below.
A Pick-up value scaled to primary value
pu Pick-up setting relative to the parameter
"Input" and the corresponding CT value
Delay curve family:
Definite time
Inverse time. See Chapter 2.
Delay type.
Definite time
Inverse time. See Chapter 2.
s Definite operation time (for definite time
only)
Inverse delay multiplier (for inverse time
only)
X1-7&8. See Chapter 8
X1-9&10
IL1 + IL2 + IL3
X1-7&8 peak mode
X1-9&10 peak mode
I'L1 + I'L2 + I'L3
s Intermittent time
s Delay at 20xIset
s Delay at 4xIset
s Delay at 2xIset
s Delay at 1xIset
User's constants for standard equations.
Type=Parameters. See Chapter 2.
3-33
> (50N/51N)
0
Note
Set
Set
Set
Set
Set
Set
Set
Set
857-UM001A-EN-P – July 2009