TB MRI3-ITE(R) 12.00 E
5
3
Design
3.1
Connections
Figure 3.1: Connection diagram
P1
P2
S1
S2
P1
P2
S1
S2
P1
P2
S1
S2
I1
I2
I3
IE
L1.1
B3
B4
L1.2
L2.1
B5
L2.2
B6
L3.1
B7
L3.2
B8
B1
B2
L1
L2
L3
Figure 3.2: Phase current measuring and earth-current detection
by means of Holmgreen-circuit.
This connection can be used with three existing phase
current transformers when combined phase and earth-
current measuring is required.
Figure 3.3: Earth-fault measuring by means of ring-core C.T. (I
E
)
When phase-- and earth-fault current measuring are
combined, the connection has to be realized as per
Figure 3.2 and Figure 3.3.
