Circutor CVM-A1000, Instruction Manual

Page: 15 / 378

3.5.- CONNECTION DIAGRAMS
3�5�1�- THREE-PHASE NETWORK MEASUREMENT WITH A 4-WIRE CONNECTION (CVM-
A1x00-ITF)�
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))�
Note: The device 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.
15
Instruction Manual
CVM-A1000 - CVM-A1500