9-26
IM 253710-01E
When displaying numerical data (the size of the signal and the phase difference between signals)
When not displaying numerical data, and when the vector size is displayed zoomed
(applicable to products with firmware version 2.01 or later)
See “Vector display of harmonics” in section 2.3, “Screens.”
For a 3P4W (three-phase four-wire)
wiring system
U1(1), U2(1), and U3(1) are common mode
voltages.
I1(1), I2(1), and I3(1) are line currents.
For a 3V3A (three-voltage, three-current)
wiring system
U1(1), U2(1), and U3(1) are line voltages.
I1(1), I2(1), and I3(1) are line currents.
For a 3P3W (three-phase three-wire)
wiring system
U1(1), U2(1), and U3(1) are line voltages.
I1(1), I2(1), and I3(1) are line currents.
However, U3(1) and I3(1) are not actually
measured for the three-phase three-wire
method. The vectors are displayed
through computation.
φ
2(1)
φ
1(1),
φ
U1-I1
φ
3(1)
φ
U1-U3
φ
U1-I2
U1(1)
I1(1)
I3(1)
U3(1)
I2(1)
U2(1)
φ
U1-U2
φ
U1-I3
I1(1)
I3(1)
I2(1)
O
U1(1)
U3(1)
U2(1)
φ
U1-U2
φ
U2-U3
φ
U3-U1
• By moving the vectors, U1(1), U2(1), and U3(1),
so that the starting points of vectors are all at
the origin, the phase relationship can be
observed in the same fashion as the three-
phase four-wire method. For the relationship
between the positions of the vectors after
moving them, see “Vector Display of
Harmonics” in section 1.6, “Waveform Display.”
(The PZ4000 does not provide a function for
moving the vectors.)
• The phase difference between the line voltages
can be determined from the phase difference
measurement functions
φ
U1-U2 and
φ
U1-U3.
φ
U1-U2 = This is the measurement function
φ
U1-U2.
φ
U2-U3 = (
φ
U1-U3) – (
φ
U1-U2) – 180
°
φ
U3-U1 = –(
φ
U1-U3)
Size of the peripheral circle (range)
9.9 Displaying the Vectors of the Harmonics