VAMP Ltd
Feeder and motor manager
Technical description
VAMP 257
VM257.EN002
VAMP 24h support phone : +358 (0)20 753 3264
41
Figure 2.3.11-3. Operation characteristic of the directional I
0
in sector mode
Setting parameters of directional earth-fault protection:
I
0
ϕ
>, I
0
ϕ
>> (67N)
Input selection
Default:
I
0
Io
- measured input (I
0
)
Io2
- measured input (I
02
)
Pa
ra
m
.
Input
Ra
nge
IoCalc - calculated from phase currents
Pickup setting
Unit:
I
0n
Io
ϕ
>
0.01 … 8.00 When Io or Io2
Pa
ra
m
.
Io
ϕ
>>
Ra
nge
0.01 … 20.0 When IoCalc
Default
0.20
Operation mode
Pa
ra
m
.
Mode
Ra
nge
ResCap, Sector,
Undir
Default
ResCap
ResCap mode characteristics
Default:
Res
Res
- resistive
Cap
- capasitive
- controlled by a digital input:
DI
Characteristics
On
Resistive
Pa
ra
m
.
ChCtrl
Ra
nge
DI1..n
Off Capasitive
Residual voltage setting
Unit:
%
Uo>
Pa
ra
m
.
Uo>>
Ra
nge
1 … 20
Default
10