62
CET Electric Technology
According to
Figure 3-30
above, I
A,
I
B
and I
c
are connected to 1-Ø SM#1, 1-Ø SM#2 and 1-Ø SM#3, respectively.
Figure 3-31
below illustrates the
CT Phase
(Voltage Phase) configuration for correctly calculating the total power for a Delta-
connected Branch Circuit. Based on the 2-wattmeter method above, the
CT Phase
setup for SM#1, SM#2 and SM#3
should be configured as
Phase AB
,
-------
(None) and
Phase BC
, respectively. In addition, the
CT Polarity
for SM#3
should
be configured as
Reverse
to satisfy the total power calculation using the 2-wattmeter method.
Figure 3-31 CT Phase and CT Polarity configuration for a 3-Phase Delta Branch Circuit
The table below lists the valid
CT Phase
options for the different Mains-I/II Wiring Modes & Branch Circuits:
Mains-I/II
Wiring Mode
Branch Circuits
WYE (3P4W)
Delta (3P3W)
2-Phase
WYE
Phase A
Phase B
Phase C
Phase AB
Phase BC
Phase CA
Phase A
Phase B
Phase C
Phase AB
Phase BC
Phase CA
Depends on taking ULN or ULL
Delta
-
Phase AB
Phase BC
Phase CA
Phase AB
Phase BC
Phase CA
Table 3-14 Valid CT Phase Options
3.2.4.5.4 Virtual Meter Setup
Click
Virtual Meter Setup
on the left-hand pane and the following page appears on the right-hand pane.
1.
Select a Virtual Meter by clicking on the VM’s radio button, for example VM1. The VM’s name can
be programmed since Firmware V1.00.10.
2.
Choose the Sub Meters or Mains-I/II (Mains-I/II can be selected in Firmware V1.00.10 or later) that
are to be aggregated for the selected VM by clicking on the check boxes of the Sub Meters in the
Virtual Meter
x
Settings
area.
After each selection, the
Number of Branches
count to the right of
the selected
VMx
will be updated immediately.
3.
Specifies
Subtraction
or
Addition
for each selection by clicking on the “
+”
or “
-
” symbol. This
feature is available in Firmware V1.00.10 or later.
4.
Click
Submit
to save your changes or
Cancel
to cancel your changes. The user is required to log in
to the web interface before any changes can be made.