VAMP 257 - Page 87

VAMP Ltd Feeder and motor manager
Technical description
VAMP 257
VM257.EN002 VAMP 24h support phone : +358 (0)20 753 3264
45
Setting parameters of earth fault protection:
I
0
>, I
0
>>, I
02
>, I
02
>> (50N/51N)
Input selection
Default:
I
0
Io - measured input (I
0
)
Io2 - measured input (I
02
)
Param.
Input
Range
IoCalc - calculated from phase currents
Pickup setting Unit:
I
0n
Io>
0.005 … 8.00 When Io
or Io2
0.005 … 20.0 When IoCalc
0.050
Io>> 0.10
Io2> 0.10
Param.
Io2>>
Range
0.01 … 8.00 When Io or Io2
0.01 … 20.0 When IoCalc
Default
0.20
Operation delay selection (only for I
0
>)
Curve
Curve
Type
A…E
- curve family selection
- delay type selection
- formula parameters
DT
IEC
IEEE
IEEE2
RI
Prg1 Prg2 Prg3
DT
Definite time
X
NI
Normal inverse
X X
VI
Very inverse
X X X
EI
Extremely inverse
X X X
LTI
Long time inverse
X X
LTEI
Long time extremely inverse
X
LTVI
Long time very inverse
X
MI
Moderately inverse
X X
STI
Short time inverse
X
STEI
Short time extremely inverse
X
RI
X
RXIDG
X
Type
Parameters
Function parameters
X X X
Programmable curve 1
X
Programmable curve 2
X
Programmable curve 3
16 programmable
[current, time] points
for each curve
X
A
X X X
B
X X X
C
X X
D
X
Parameters
Active only, when
Type = Parameters
Usage of these parameters are defined
by the delay formulas
E
X
Definite operating time Unit:
Seconds
1.00 (Io>)
1.00 (Io>>)
0.50 (Io2>)
Param.
t>
Range
0.08 ... 300.0
Default
1.00 (Io2>>)