YOKOGAWA WT210 User Manual page 80

4.5 Setting the Scaling Value When External PT/CT is Used
Explanation
4-12
Turning ON/OFF Scaling
Set the scaling functin
1.
( Display C )
SETUP
2.
Scaling Function
This function is useful for measuring voltage, current, power and such when you are
using an external potential transformer (PT), current transformer (CT) or such, and
have connected their secondary side outputs to the input elements. You set the
scaling value to the PT ratio, CT ratio or power coefficient. When the scaling function
is turned ON, measured values which have been converted to the corresponding
values for the transformer primary sides, can been displayed or otherwise output.
Measured/computed value
Voltage V
Current A
Active power W
Reactive power var
Apparent power VA
Selecting the Input Element
This setting is to select to which element scaling will be applied. The initial value is
"ALL". At the WT210, this selection menu will not appear.
• ALL: Select this when the same scaling constant should be applied to all elements
together.
• EL1: Select this when the scaling constant should only be applied to element 1.
• EL2: Select this when the scaling constant should only be applied to element 2.
This selection will not appear on model 760502.
• EL3: Select this when the scaling constant should only be applied to element 3.
• End: Select this when you finished the setting, or when you want to abort the setting.
Setting the Scaling Constant
The scaling constant are set in the following order. The setting ranges from 0.001 to
9999. The initial value is 1.000.
• P: Sets the PT ratio on display A
• C: Sets the CT ratio on display B
• F: Sets the power value on display C
In case of the WT210, pressing the ENTER key after setting P, C and F respectively
will end this scaling setting. In case of the WT230, selecting End at the input element
menu will end this scaling setting.
3.
( Display C )
ENTER
4.
Scaled result
P × V
P: Voltage scaling constant
C × A
C: Current scaling constant
F × P × C × W
F: Power scaling constant
F × P × C × var
F × P × C × VA
5.
ENTER
End of setting
IM 760401-01E