UNIPOWER
UP-2210R/P Hardware installation and configuration manual
25
4.4.8
1-phase measurement with one PT and one CT
Figure 17
The above wiring diagram is used for single-phase measurement in public distribution networks with
one CT and one PT. The voltage channel of the unit is connected to PT for measuring line-to-neutral
voltage. The current channel is connected to existing instrument transformer, allowing the
measurement of high currents, e.g. directly from the secondary side of a power transformer.
Always
protect the voltage inputs with a suitable fuse in each conductor. The connection for this type of
measurement is as follows:
Channel:
Measured object:
Channel:
Measured object:
U1
=
L1 PT+
I1+
=
L1 CT+
Ref
=
L1 PT-(Grounded)
I1-
=
L1 CT-