3-Phase, 3-Element Metering - ABB A43 User Manual

Measurement Methods
Illustration The diagrams below shows 2-element measurements with only 1 current
transformer. This method will only give correct result in a balanced system.
Note that the current flows backwards through phase 1 and 3 and that the phase
voltages not are connected to the normal inputs when the current transformer is
connected to phase 1 and 3.

7.1.3 3-Phase, 3-Element Metering

3-element metering in a 4-wire system
This method is normally used in three phase systems that have a neutral
conduc-tor.
In a 3-element meter the neutral voltage is used as the voltage reference and the
voltage difference between the neutral voltage and the L1, L2 and L3 voltages are
measured and multiplied by its respective current. The active energy consumed
A43/A44
User Manual
1 2 3
S1 S2
L1
P1 P2
L2
L3
1 2 3
L1
L2
L3
1 2 3
L1
L2
L3
90
4 5 6 7 8 9 11
4 5 6 7 8 9 11
S1 S2
P1 P2
4 5 6 7 8 9 11
S1 S2
P1 P2
2CMC48001M0201
Revision: C