VAMP Ltd
Feeder and motor manager
Technical description
VAMP 257
VM257.EN002
VAMP 24h support phone : +358 (0)20 753 3264
105
3.
Applications
The following examples illustrate the versatile functions of the
feeder and motor manager VAMP 257 in different applications.
3.1.
Substation feeder protection
3
3
v
amp25
7
app1
+
VAMP257
VAMP257
Figure 3.1-1 VAMP feeder and motor managers used in substation feeder
protection
The feeder manager includes three-phase overcurrent
protection, directional earth fault protection and fast arc
protection. At the incoming feeder, the instantaneous stage
I>>> of the VAMP feeder managers is blocked with the start
signal of the overcurrent stage. This prevents the trip signal if
the fault occurs on the outgoing feeder.
For the directional function of earth fault function, the status
information (on/off) of the Petersen coil is routed to one of the
digital inputs of the feeder manager so that either I
0sin
ϕ
or I
0cos
ϕ
function is obtained.
The function I
0sin
ϕ
is used in isolated networks, and the
function I
0cos
ϕ
is used in resistance or resonant earthed
networks.
