VAMP 259 - Page 94

2.11 Earth fault protection I0>
(50N/51N)
2 Protection functions
Technical description
94
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VM259.EN007
Parameter
Value
Unit
Description
Note
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
IoCalc
IoPeak
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 chapter
2.24.
Set
Type
DT
NI
VI
EI
LTI
Parameters
Delay type.
Definite time
Inverse time. See chapter
2.24.
Set
t>
s
Definite operation time (for
definite time only)
Set
k>
Inverse delay multiplier (for
inverse time only)
Set
Input
I
0
I
0Calc
I
0Peak
X1:7-8. See chapter 8.
I
L1
+ I
L2
+ I
L3
X1:7-8 peak mode (I
0
> only)
Set
Intrmt
s
Intermittent time
Set
Dly20x
s
Delay at 20xIoset
Dly4x
s
Delay at 4xIoset
Dly2x
s
Delay at 2xIoset
Dly1x
s
Delay at 1xIoset
A, B, C, D,
E
User‘s constants for standard
equations. Type=Parameters.
See chapter 2.24.
Set
For details of seting ranges see chapter 9.3.
Set = An editable parameter (password needed)
C = Can be cleared to zero
F = Editable when force flag is on