Connection diagrams – CIRCUTOR CVM-B Series User Manual
Page 14
3.4.- CONNECTION DIAGRAMS
3�4�1�- Three-phase network measurement with a 4-wire connection�
Measurement system:
Secondary winding of the current transformer:
(MC1 type transformer)
Secondary winding of the neutral current transformer:
Power
Supply
V
L1
L1
L2
L3
N
V
L3
L2
V
L1
V
V
L1
V
L2
V
L3
a
b
A
B
a
b
A
B
S1 S2 S1 S2 S1 S2
L1
P1
P2
L2
L3
P1 P2P1 P2
S1 S2
LN
P1
P2
N
V
REF
REF
N
S1
S2
P1
P2
POWER SUPPLY
~
~
+
-
V
L2
V
L3
N
V
REF
N
REF
a
b
A
B
V
REF
N
REF
S1
S2
P1
P2 S1
S2
P1
P2 S1
S2
P1
P2
LOAD
figure 3: Three-phase measuring with a 4-wire connection (transformer secondary: /1A, /5A or MC1 (/0�250))�
NB: The unit can calculate the neutral current without having to measure it, option: Calculated
current
.
The MC1 transformer secondary value is set to 0.250 A
The transformer for measuring the LN neutral current cannot be MC type.
14
CVM-B100 - CVM-B150
Instruction Manual