Three-Phase Overcurrent Protection With Two Current Transformers; Di Controlled Overcurrent Scaling - VAMP 140 Operation And Configuration Instructions

VAMP 140
3.9.
3.10.
36
Overcurrent and earth-fault relay
Technical description
Three-phase overcurrent protection
with two current transformers
Figure 3.9-1 When current transformers are available on only two phases,
the three-phase overcurent protection can be carried out by connecting the
current transformers as shown in the above figure.

DI controlled overcurrent scaling

The setting of the three overcurrent stages can also be
controlled by the digital input. In this case only two scaling
coefficients are possible: 100% (DI is inactive) and any
configured value between 20% - 100% (DI is active).
If you want to use this feature, it must be first enabled using
VAMPSET, or from the local panel using the following
procedure:
Go to main menu "ENABLE" using the UP/DOWN
•
keys.
Press RIGHT key to enter submenu "Enable I".
•
Press RIGHT key again to enter this menu.
•
Go to line "Isca: Off" by pressing the UP/DOWN keys.
•
Press ENTER. The device will ask for an operator
•
password:
Vamp 24h support phone +358 (0)40 573 6316
VAMP Ltd
VM140.EN011