YOKOGAWA WT500 User Manual page 30

IM 760201-01E
• Harmonic Measurement Functions That Express the Voltage and Current Phase
Differences (f) between and within Input Elements
There are five kinds of harmonic measurement functions that express phase
differences:
fUi-Uj, fUi-Uk, fUi-Ii, fUi-Ij, fUi-Ik
(i, j, and k are input element numbers)
The following explanation of the five kinds of harmonic measurement functions is for
the case when the number of input elements in wiring unit Σ is three and their common
wiring system is three phase, four wire. Also, i = 1, j = 2, and k = 3.
In this case, the following numeric data for the phase differences between elements 1,
2, and 3 is calculated.
• fU1-U2
The phase difference between the fundamental voltage of element 1, U1(1), and
the fundamental voltage of element 2, U2(1).
• fU1-U3
The phase difference between the fundamental voltage of element 1, U1(1), and
the fundamental voltage of element 3, U3(1).
• fU1-I1
The phase difference between the fundamental voltage of element 1, U1(1), and
the fundamental current of element 1, I1(1).
• fU1-I2
The phase difference between the fundamental voltage of element 1, U1(1), and
the fundamental current of element 2, I2(1).
• fU1-I3
The phase difference between the fundamental voltage of element 1, U1(1), and
the fundamental current of element 3, I3(1).
• Functions for Averaging and Summing Input Elements (Σ functions)
The following six harmonic measurement functions are available. For details about
how the measurement function values are determined, see appendix 1.
Characters or number
Measurement
in parentheses
Function
Total
U ( )
Yes
I ( )
Yes
P ( )
Yes
S ( )
Yes
Q ( )
Yes
( )
Yes
Functions with parentheses will produce different values depending on which of the
following is contained in their parentheses.
• total: The total value is displayed.
• 1: The numeric data of the fundamental signal is displayed.
2.2 Measurement Functions and Periods
1
Yes Yes: Numeric data available
Yes
Yes
Yes
Yes
Yes
1
2
3
4
5
6
7
8
9
10
11
12
13
14
App
Index
2-7