YOKOGAWA wt3000, User Manual, Page: 151 / 384

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IM 760301-01E
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App
Index
Power Measurement
• Setting the Operand Parameters
There are two types of operands with parameters.
• Setting Operands with Two Parameters
Set a symbol representing the element in the left parameter and the order in the
right parameter.For example, set the parameters as in (E1,OR2).
• Symbols representing elements
E1 to E4: Elements 1 to 4
E5 and E6: Σ A and Σ B
• Symbols representing orders
ORT: Normal measured value or total value*
1
OR0: DC*
2
OR1: Fundamental wave*
2
OR2 to OR100: Harmonics*
2
*1 A normal value or total value (requires the /G6 option) is substituted depending on the
measurement mode.
*2 Requires the /G5 or /G6 option.
• Setting Operands with a Parameter
Set a symbol representing the element.You do not have to set the order.For
example, set the parameter as in (E1).
For the symbols that can be set in the parameters of each operand, see appendix 13.
• Values Substituted in Operands
• Urms, Umn, Udc, or Urmn is substituted into U( , ) according to the specified
voltage mode.
• Irms, Imn, Idc, or Irmn is substituted into I( , ) according to the specified current
mode.
• Values are substituted into URMS ( ) and UMN ( ) according to the voltage/
current mode as follows:
Voltage mode
RMS MEAN DC RMEAN
Yes
Yes
Yes
Yes
No
Yes
No
Yes
URMS( )
UMN( )
• If the voltage and current modes are set to RMS and UMN( ) is assigned for the
user-defined function, Urms, Umn, Irms, and P can be measured simultaneously.
• If the voltage and current modes are set to MEAN and URMS( ) is assigned for the
user-defined function, Urms, Umn, Imn, and P can be measured simultaneously.
• Urms, Umn, Irms, and Imn cannot be measured simultaneously.
• The substituted value of TI() is the same regardless of which element symbol
(E1 to E4) is set in TI(). The unit of TI ( ) is seconds (S).
• Functions η 1 to η 4 (efficiency 2) are displayed as percentages as indicated by
the equations given in appendix 1, “Symbols and Determination of Measurement
Functions.” However, ETA1 to ETA4 described in this section are displayed as
ratios.
Example η 1: 80 %, ETA1 = 0.8
• The U1 of PHIU1U2 represents the voltage signal of the element whose element
number is the smallest in the wiring unit (
Σ
A or
Σ
B). For example, if input
elements 2, 3, and 4 are assigned to wiring unit Σ A, PHIU1U2 is the phase
difference between the voltage signal of input element 2 and that of input
element 3.
5.4 Setting the User-Defined Function