YOKOGAWA WT1800 User Manual page 111
Precision power analyzer
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Measurement Function
Harmonic voltage distortion
factor
Uhdf( ) [%]
Harmonic current distortion
factor
Ihdf( ) [%]
Harmonic active power
distortion factor
Phdf( ) [%]
Total harmonic voltage
distortion
Uthd [%]
Total harmonic current
distortion
Ithd [%]
Total harmonic active power
distortion
Pthd [%]
Voltage telephone harmonic factor Uthf [%]
Current telephone harmonic factor Ithf [%]
Voltage telephone influence factor Utif
Current telephone influence factor Itif
Harmonic voltage factor hvf [%]
Harmonic current factor hcf [%]
K-factor
*1
The expression varies depending on the definitions in the standard. For more details, see the standard
(IEC34-1: 1996).
max
*2
U
U(Total) =
(k)
k = min
Note
•
k denotes a harmonic order, r denotes the real part, and j denotes the imaginary part.
•
The minimum harmonic order is denoted by min.
•
The upper limit of harmonic analysis is denoted by max. max is either an automatically determined value
or the specified maximum measured harmonic order, whichever is smaller.
IM WT1801-03EN
Appendix 1 Symbols and Determination of Measurement Functions
Methods of Computation and Determination
The numbers and characters in the parentheses are
dc (when k = 0) or k (when k = 1 to max).
When the Denominator of the
Distortion Factor Equation Is the
Total Value (Total)
U(k)
U(Total)
I(k)
I(Total)
*2
P(k)
P(Total)
max
2
U(k)
k = 2
U(Total)
*1
max
2
I(k)
k = 2
I(Total)
*2
max
P(k)
k = 2
P(Total)
*2
max
1
Uthf =
U(Total)
*2
k = 1
λ(k): coefficient defined in the applicable standard (IEC34-1 (1996))
max
1
Utif =
U(Total)
*2
k = 1
T(k): coefficient defined in the applicable standard (IEEE Std 100 (1992))
max
*1
1
hvf =
*1
U(Total)
*2
k = 2
K-factor =
max
2
I
2
,
I(Total) =
(k)
,
P(Total) =
k = min
When the Denominator of the
Distortion Factor Equation Is the
Fundamental Wave (Fundamental)
100
•
*2
100
•
100
•
*2
100
•
100
•
100
•
{
}
2
λ(k)
U(k)
100
Ithf =
•
•
I(Total)
{
}
2
T(k)
U(k)
Itif =
•
I(Total)
2
U(k)
hcf =
100
•
I(Total)
k
max
{I
2
2
}
(k)
k
•
k = 1
max
I
2
(k)
k = 1
max
P
(k)
k = min
(Table 2/4)
U(k)
100
•
U(1)
I(k)
100
•
I(1)
P(k)
100
•
P(1)
max
2
U(k)
k = 2
100
•
U(1)
max
2
I(k)
k = 2
100
•
I(1)
max
P(k)
k = 2
100
•
P(1)
max
1
{
}
2
λ(k)
I(k)
100
•
•
*2
k = 1
max
1
{
}
2
T(k)
I(k)
•
*2
k = 1
max
2
I(k)
1
100
•
*2
k
k = 2
App-5
1
2
3
4
5
6
App
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