2-14
IM WT310E-01EN
Turning Scaling On and Off
Select the scaling feature.
(Display B)
1.
2.
3.
4.
(Display C)
5.
Confirm the
setting.
Close menu.
6.
Explanation
Scaling
You can set coefficients for when you apply a voltage or current signal from an external voltage
transformer
1
or current transformer.
2
The coefficients that you can set using scaling are the VT ratio, CT ratio, and power coefficient (SF).
1 VT (voltage transformer)
2 CT (current transformer)
VT Ratio and CT Ratio
You can set the VT or CT ratio to convert measured data to numeric data or waveform display data of
voltage or current at the point before the voltage or current transformation.
Power Coefficient
By setting the power coefficient (F), you can display the measured active power, apparent power, and
reactive power after they have been multiplied by a coefficient.
Measurement Function
Data before Transformation
Transformation Result
Voltage U
U
2
(secondary output of the VT)
U
2
×V
V: VT ratio
Current I
I
2
(secondary output of the CT)
I
2
×C
C: CT ratio
Active power P
P
2
P
2
×V×C×F
F: Power coefficient
Apparent power S
S
2
S
2
×V×C×F
Reactive power Q
Q
2
Q
2
×V×C×F
Max./min. voltage Upk
Upk
2
(secondary output of the VT)
Upk
2
×V
Max./min. current Ipk
Ipk
2
(secondary output of the CT)
Ipk
2
×C
Scaling Coefficient
Setting All the Coefficients or Individual Coefficients
On the WT332E/WT333E, you can select the elements whose coefficients you want to set. The default
setting is ALL. The setting method selection menu will not appear on the WT310E or WT310EH.
• ALL: Select this option to set all the coefficients of each element to the same value.
• EL: Select this option to set the coefficient of element 1.
• EL2: Select this option to set the coefficient of element 2. On the WT332E, this option does not
appear.
• EL3: Select this option to set the coefficient of element 3.
• End: Select this option after you have finished configuring the settings or if you have chosen not to
change the settings.
2.5 Setting the Scaling Feature When Using a VT or CT
