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Measurement Functions
during Harmonic Measurement
Voltage harmonic distortion factor
Uhdf( ) [%]
Current harmonic distortion factor
Ihdf( ) [%]
Active power harmonic distortion factor
Phdf( ) [%]
Total harmonic distortion of voltage
Uthd [%]
Total harmonic distortion of current
Ithd [%]
Total harmonic distortion of
active power
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 [%]*
1
Harmonic current factor
1
hcf [%]*
*1
The equation varies depending on the definitions in the relevant standard. For details see the standard (IEC34-
1:1996).
max
*2
U
2
(k)
U(Total) =
,
k = min
IM WT3001E-51EN
Characters/Numbers inside the parentheses of measurement
functions are dc (when k = 0) and k (when k = 1 to max).
When the numerator of the distortion
factor equation is all (Total)
U(k)
•
*2
U(Total)
I(k)
•
I(Total)
*2
P(k)
•
*2
P(Total)
max
U(k)
k = 2
*2
U(Total)
max
2
I(k)
k = 2
*2
I(Total)
max
P(k)
k = 2
P(Total)*
max
1
Uthf =
U(Total)
*2
k = 1
λ(k):Constant defined in the applicable standard (IEC34-1(1996))
max
1
Utif =
*2
U(Total)
k = 1
T(k):Constant defined in the applicable standard (IEEE Std 100(1992))
max
1
hvf =
*2
U(Total)
k = 2
max
I
2
(k)
I(Total) =
,
P(Total) =
k = min
Note
•
Variables k, r, and j denote the harmonic order, real part, and imaginary part, respectively.
•
Variable min is the minimum measured order.
•
Variable max is the upper limit of measured order. The upper limit is determined
automatically (maximum is 100) by the frequency of the PLL source.
7.11 Harmonic Measurement Specifications
Method of Determination, Equation
When the numerator of the distortion
factor equation is fundamental
100
100
100
2
100
•
100
•
100
•
2
{
}
2
λ(k)
U(k)
100
Ithf =
•
•
I(Total)
{
}
2
T(k)
U(k)
Itif =
•
I(Total)
2
U(k)
100
hcf =
•
k
I(Total)
max
P
(k)
k = min
(Table 2/3)
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
{
λ(k)
I(k)
}
2
100
•
•
*2
k = 1
max
1
{
}
2
T(k)
I(k)
•
*2
k = 1
max
2
I(k)
1
100
•
*2
k
k = 2
(Continues on the next page)
7-43
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Index
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