Rockwell Automation 865 Differential Protection Relay - Manual (Page 64)

3-20 Protection Functions
865-UM001A-EN-P – July 2009
Table 3.11 – Parameters of the Undirectional Earth Fault Stage I 0 > (50N/51N)
(cont.)
Parameter Value Unit Description Note
Io
Io2
IoCalc
IoPeak
Io2Peak
I’oCalc pu The supervised value according the
parameter "Input" below.
Io> A Pick-up value scaled to primary value
Io> pu Pick-up setting relative to the parameter
"Input" and the corresponding CT value Set
Curve
DT
IEC
IEEE
IEEE2
RI
PrgN
Delay curve family:
Definite time
Inverse time. See “Inverse Time
Operation”.
Set
Type
DT
NI
VI
EI
LTI
Parameters
Delay type.
Definite time
Inverse time. See “Inverse Time
Operation”, Table 3.23.
Set
t> s Definite operation time (for definite time
only) Set
k> Inverse delay multiplier (for inverse time
only) Set
Input Io1
Io2
IoCalc
Io1Peak
Io2Peak
I’oCalc
X1-7&8. See Chapter 9.
X1-9&10
IL1 + IL2 + IL3
X1-7&8 peak mode
X1-9&10 peak mode
I’L1 + I’L2 + I’L3
Set
Intrmt s Intermittent time Set
Dly20x s Delay at 20xIset
Dly4x s Delay at 4xIset
Dly2x s Delay at 2xIset
Dly1x s Delay at 1xIset
A, B, C, D,
E User's constants for standard equations.
Type=Parameters. See “Inverse Time
Operation”. 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