4 Recommended Recording Practice and Instrument Connection
67
Figure 4.6: Choosing 1-phase 3-wire system on instrument
Instrument should be connected to the network according to figure bellow.
LN L3 C
B
A
L1
L1
L3C
N
A
L2
L2
B
Figure 4.7: 1-phase 3-wire system
Note:
In case of events capturing, it is recommended to connect unused voltage inputs
to N voltage input.
4.2.2 Connection to the MV or HV Power System
In systems where voltage is measured at the secondary side of a voltage transformer
(say 11 kV / 110 V), the instrument voltage range should be set to 50÷110V and scaling
factor of that voltage transformer ratio has to be entered in order to ensure correct
measurement. In the next figure settings for this particular example is shown.
