MI 2883 Energy Master
Recording Practice and Instrument Connection
102
When connecting the instrument it is essential that both current and voltage connections
are correct. In particular the following rules have to be observed:
Clamp-on current clamp-on transformers
The arrow marked on the clamp-on current transformer should point in the
direction of current flow, from supply to load.
If the clamp-on current transformer is connected in reverse the measured power
in that phase would normally appear negative.
Phase relationships
The clamp-on current transformer connected to current input connector I
1
has to
measure the current in the phase line to which the voltage probe from L
1
is
connected.
3-phase 4-wire system
In order to select this connection scheme, choose following connection on the
instrument:
Figure 4.3: Choosing 3-phase 4-wire system on instrument
Instrument should be connected to the network according to figure below:
N
Figure 4.4: 3-phase 4-wire system
