CHAPTER 7. INTEGRAL OPERATION FUNCTION
30
Harmonics can be displayed in the whole sequence, odd sequence and even sequence. The following is the whole-
sequence harmonic bar chart.
Description of interface information:
Total harmonic parameter: including the total harmonic distortion (THD) factor and total harmonic content. When
different measurement functions are selected, different harmonic parameters will be displayed. When the soft key
corresponding to the “FUNC” parameter is pressed, different measurement functions can be selected. W/A/U can
be selected as the measurement function in sequence when this button is pressed once. Parameter meanings of
different functions are as follows:
Power (W) total harmonic distortion rate of power and total harmonic power
Current (A) total harmonic distortion rate of current and total harmonic current
Voltage (U): total harmonic distortion rate of voltage and total harmonic voltage
Single-order harmonic parameters: displaying the frequency, harmonic content, harmonic distortion factor and
phase of single-order harmonics. The user can rotate the knob to select the single-order harmonics to be
displayed. The selected harmonics are displayed in red in the bar chart form.
Description of harmonic list interface
When the “LIST” button is selected in the harmonic measurement interface, the list of harmonic meas
urement
results will be displayed. This list is used for showing the voltage, current, active power, reactive power, phase and
total harmonic distortion (THD) factor of different harmonics. Harmonic lists can be displayed in the whole
sequence, odd sequence and even sequence. Below is a whole-sequence harmonic list.
Harmonic content: this list is used for showing all harmonic contents of single-order harmonics, including the
voltage, current and power. You can view other harmonic parameters by operating the Left/Right button to turn
pages. In this case, the line scroll bar and current page are shown in bright white circles. Measurement parameters
are described in the following table:
Harmonic order list: this LIST can show the data of one-order to 50-order harmonic signals. These data can be
displayed in the whole sequence, odd sequence and even sequence. The rows which are not displayed, i.e.
single-order harmonic data which are not displayed, can be presented by operating the Up/Down button. In this
case, the row scroll bar and current page in displayed in bright blue bars.
6.2
Setting of Harmonic Measurement Configuration
You can set the distortion factor calculation formula, PLL source, harmonic sequence and harmonic analysis times
of harmonic measurement. Specific steps are as follows: Operation steps
1.
Press
to enter the harmonic measurement interface.
2.
Press the soft key corresponding to the “SETUP” parameter in the harmonic measurement display interface
to enter the harmonic parameter configuration inter
face. Press the “ ” button to select the required
parameter, as shown in Figure
6.1
.
Abbreviations
Instruction
U(V)
Voltage
φ
UI(
◦
)
Phase difference of k-order harmonic voltage and harmonic current
A(mA)
Current
φ
UU(
◦
)
Phase difference of harmonic voltage U(k) and fundamental wave U(1)