Technical description
7 Application
7.1 Substation feeder protection
VM50.EN004
VAMP 24h support phone +358 (0)20 753 3264
185
3
3
v
amp50app2
+
VAMP 5
0
Overcurrent and Earth/fault Relay
Power
Error
Alarm
Trip
VAMP 5
0
Overcurrent and Earth/fault Relay
Power
Error
Alarm
Trip
Figure 7.1-2 VAMP 52 used in substation feeder protection in compensated
network
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 device so that either I
0sin
or I
0cos
function is obtained.
The function I
0sin
is used in isolated networks, and the
function I
0cos
is used in resistance or resonant earthed
networks.