4 Recommended Recording Practice and Instrument Connection
65
The actual connection scheme has to be defined in MEASURING SETUP menu (see
Figure below).
Figure 4.1: Measuring configuration menu
When connecting the instrument it is essential that both current and voltage connections
are correct. In particular the following rules have to be observed:
Current clamp-on current transformers
•
The arrow marked on the clamp-on current transformer has to 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 4.2: Choosing 3-phase 4-wire system on instrument
Instrument should be connected to the network according to figure bellow:
