YOKOGAWA WT3002E - Page 146

7-43
IM WT3001E-51EN
Harmonic Measurement in Normal Measurement Mode (Option)
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Index
Voltage harmonic distortion factor
Uhdf( ) [%]
Total harmonic distortion of voltage
Uthd [%]
Characters/Numbers inside the parentheses of measurement
functions are dc (when k = 0) and k (when k = 1 to max).
Measurement Functions
during Harmonic Measurement
Method of Determination, Equation
(Table 2/3)
U(k)
U(Total)
*2
U(k)
U(1)
• 100 • 100
P(k)
P(Total)
*2
P(k)
P(1)
• 100 • 100
I(k)
I(Total)
*2
I(k)
I(1)
• 100 • 100
Active power harmonic distortion factor
Phdf( ) [%]
Current harmonic distortion factor
Ihdf( ) [%]
k = 2
max
U(k)
2
U(Total)
*2
•
100
k = 2
max
U(k)
2
U(1)
• 100
Total harmonic distortion of
active power
Pthd [%]
k = 2
max
P(k)
P(Total)*
2
•
100
k = 2
max
P(k)
P(1)
• 100
Total harmonic distortion of current
Ithd [%]
k = 2
max
I(k)
2
I(Total)
*2
•
100
k = 2
max
I(k)
2
I(1)
• 100
Voltage telephone harmonic factor
Uthf [%]
Current telephone harmonic factor
Ithf [%]
{λ(k) • U(k)}
2
1
k = 1
max
•
100
{λ(k) • I(k)}
2
k = 1
max
•
100
λ(k):Constant defined in the applicable standard (IEC34-1(1996))
Voltage telephone influence factor
Utif
Current telephone influence factor
Itif
T(k):Constant defined in the applicable standard (IEEE Std 100(1992))
Uthf =
{T(k) • U(k)}
2
k = 1
max
{T(k) • I(k)}
2
k = 1
max
Harmonic voltage factor
hvf [%]*
1
Harmonic current factor
hcf [%]*
1
U(k)
2
k
k = 2
max
•
100
I(k)
2
k
k = 2
max
•
100
When the numerator of the distortion
factor equation is all (Total)
When the numerator of the distortion
factor equation is fundamental
U(Total)
*2
1
Ithf =
I(Total)
*2
1
Utif =
U(Total)
*2
1
Itif =
I(Total)
*2
1
hvf =
U(Total)
*2
1
hcf =
I(Total)
*2
(Continues on the next page)
*1 The equation varies depending on the definitions in the relevant standard. For details see the standard (IEC34-
1:1996).
*2
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.
U(k)
2
k = min
max
U(Total) =
I(k)
2
k = min
max
I(Total) =,
k = min
max
P(Total) =,
P
(k)
7.11 Harmonic Measurement Specifications