YOKOGAWA WT500 User Manual

2-7
IM 760201-01E
Features
3
2
1
4
5
6
7
8
9
10
11
12
13
14
App
Index
• 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 e
xpress phase
differences:
f
Ui-Uj,
f
Ui-Uk,
f
Ui-Ii,
f
Ui-Ij,
f
Ui-Ik
(i, j, and k are input element numbers)
The following explanation of the five kinds of harmonic measu
rement 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 dif
ferences between elements 1,
2, and 3 is calculated.
•
f
U1-U2
The phase dif
ference between the fundamental voltage of element 1, U1(1), and
the fundamental voltage of element 2, U2(1).
•
f
U1-U3
The phase dif
ference between the fundamental voltage of element 1, U1(1), and
the fundamental voltage of element 3, U3(1).
•
f
U1-I1
The phase dif
ference between the fundamental voltage of element 1, U1(1), and
the fundamental current of element 1, I1(1).
•
f
U1-I2
The phase dif
ference between the fundamental voltage of element 1, U1(1), and
the fundamental current of element 2, I2(1).
•
f
U1-I3
The phase dif
ference 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.
1
Yes
Yes
Yes
Yes
Yes
Yes
Total
Yes
Yes
Yes
Yes
Yes
Yes
U3( )
I3( )
P3( )
S3( )
Q3( )
L3( )
Characters or number
in parentheses
Measurement
Function
Yes: Numeric data available
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

YOKOGAWA WT500 Specifications

General

Brand	YOKOGAWA
Model	WT500
Category	Measuring Instruments
Language	English