3-11
IM WT5000-01EN
Power Coefficient (SF Scaling, Scaling Factor)
By setting the power coefficient (SF), you can display the measured active power, apparent power, and reactive
power after they have been multiplied by a coefficient.
Measurement Function
Data before Conversion
Conversion 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×SF
SF: Power coefficient
Apparent power S
S
2
S
2
×V×C×SF
Reactive power Q
Q
2
Q
2
×V×C×SF
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
Selectable range: 0.0001 to 99999.9999
• If the value of the result of multiplying the measured value by the VT ratio, CT ratio, or power coefficient
(scaling factor) exceeds 9999.99 M, “-OF-” will appear in the numeric data display frame.
• To correctly compute the power and efficiency of Σ functions, set the power coefficients of all elements so
that all power units used in the computation are the same. For example, the efficiency cannot be computed
correctly if elements or wiring units used in the computation have different power units, such as W (watt)
and J (joule). To compute the efficiency correctly, make all the power units the same (either all W or all J).
Copying the VT Ratio, CT Ratio, or Power Coefficient (Exec Copy Σ)
Copying the VT Ratio (VT Scaling Copy Exec)
Copy the VT ratio of the selected input element to the other input elements in the same wiring unit.
Copying the CT Ratio (CT Scaling Copy Exec)
Copy the CT ratio of the selected input element to the other input elements in the same wiring unit.
Copying the Power Coefficient (SF Scaling Copy Exec)
Copy the power coefficient of the selected input element to the other input elements in the same wiring unit.
Because the scaling feature sets each input element independently, regardless of the range Σ link on /off
setting, execute copying if necessary.
3 Input Settings (Basic Measurement Conditions)
