1-8
IM 253710-01E
• Harmonic measurement function that indicates the phase difference (
φ
) of the
voltage and current between the power measurement modules
•
φ
U1-U2
The phase difference of the fundamental signal of the voltage of element 2,
U2(1), with respect to the fundamental signal of the voltage of element 1, U1(1).
•
φ
U1-U3
The phase difference of the fundamental signal of the voltage of element 3,
U3(1), with respect to the fundamental signal of the voltage of element 1, U1(1).
•
φ
U1-I1
The phase difference of the fundamental signal of the current of element 1,
I1(1), with respect to the fundamental signal of the voltage of element 1, U1(1).
•
φ
U1-I2
The phase difference of the fundamental signal of the current of element 2,
I2(1), with respect to the fundamental signal of the voltage of element 1, U1(1).
•
φ
U1-I3
The phase difference of the fundamental signal of the current of element 3,
I3(1), with respect to the fundamental signal of the voltage of element 1, U1(1).
• Harmonic measurement function of the average or of the sum of the power
measurement modules (
Σ
function)
The following six types of numerical data can be determined. For details related to
the determination of the measurement function, see Appendix 2.
dc
Yes
Yes
Yes
Yes
Always 0
Yes
1
Yes
Yes
Yes
Yes
Yes
Yes
k
Yes
Yes
Yes
Yes
Yes
Yes
All (No ( ))
Yes
Yes
Yes
Yes
Yes
Yes
U
Σ
( )
I
Σ
( )
P
Σ
( )
S
Σ
( )
Q
Σ
( )
λΣ
( )
Chars and numbers inside ( )
Measurement
Function
Yes
: Numerical data exist
• Measurement functions having parentheses have the following meanings
depending on the characters or numbers that are inside the parentheses
• dc : Indicates numerical data related to the DC component.
• 1 : Indicates numerical data related the fundamental signal.
• k : Indicates numerical data related to the 2nd to Nth order harmonics. N is
the upper limit of the harmonic order under analysis. The upper limit is
determined automatically (maximum is 500) by the frequency of the PLL
source.
• All : No parenthesis is appended after the measurement function. This indicates
numerical data related to all waveforms including the fundamental and the
harmonics.
1.2 Measurement Modes and Measurement/Computation Periods