VAMP 257 - Page 83

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
)
Param.
Input
Range
IoCalc - calculated from phase currents
Pickup setting Unit:
I
0n
Ioϕ>
0.01 … 8.00 When Io or Io2
Param.
Ioϕ>>
Range
0.01 … 20.0 When IoCalc
Default
0.20
Operation mode
Param.
Mode
Range
ResCap, Sector,
Undir
Default
ResCap
ResCap mode characteristics
Default:
Res
Res - resistive
Cap - capasitive
- controlled by a digital input:
DI Characteristics
On Resistive
Param.
ChCtrl
Range
DI1..n
Off Capasitive
Residual voltage setting Unit:
%
Uo>
Param.
Uo>>
Range
1 … 20
Default
10