The power quality analysis tester is equipped with a four-core voltage test line and three current test tongs (up to six as needed). The voltage test line is used to access the measured voltage signal, and is tested in the field with a current clamp. Each current clamp corresponds to a clamp interface, which cannot be interchanged. Otherwise, the test accuracy will be affected. There is a circle in the middle of each clamp. Sticker, showing the phase and polarity of the clamp meter (the end of the standard N is the current outflow end, the polarity should be paid attention to when using the wiring, and the reverse will affect the test result).
Issues to be aware of during the test:
1. Insert the current test clamp before the test. It is forbidden to insert the current clamp socket after clamping the measured signal first. This is equivalent to the secondary open circuit of the current test clamp, which is easy to generate open circuit high voltage and damage the instrument. After the test is completed, remove all current test tongs and then unplug the main unit.
2, test tongs to ensure the accuracy of each channel, should be one-to-one correspondence, the current clamp should be correctly inserted into the only corresponding socket. Exchanging different inputs will reduce the accuracy of the test, but the general test accuracy will not exceed ±2% after the crossover.
3. When connecting the voltage signal, the test line must first be connected to the voltage terminal of the instrument, and then to the voltage terminal of the device under test. After the test is completed, the voltage connector of the device under test must be removed first, and then the instrument side is removed. Voltage line. (This article is especially important, and vice versa may cause a major accident)
The following describes the different test items.
(1) Measurement of electrical parameters of equipment in three-phase four-wire system
1. Test purpose
Detect the three-way voltage and three-way current signals of the device under test, and use the test data to understand the real-time voltage amplitude, current amplitude, active power, reactive power, phase, frequency, and vector between each parameter of the device under test. The real situation of the relationship; the vector diagram of the six parameters can be displayed on the same screen to determine the operation of the power supply system, and it is convenient to analyze the cause of the fault and the cause of the line loss.
2, test method
Specific wiring: three-phase four-wire equipment test wiring diagram
When using the portable power quality analyzer, connect the phase A voltage of the device under test and the phase A voltage terminal of the instrument, the green wire to the phase B voltage of the device under test, and the phase B of the instrument in the three-phase four-wire system. The voltage terminal and the red wire are connected to the C-phase voltage of the device under test and the C-phase voltage terminal of the instrument; the three clamp-type current transformers are used to measure the A, B, and C phases of the current of the device under test, and then enter the test after connecting the line. The "Parameters" screen looks at the measurement results.
(II) Measurement of electrical parameters of equipment in three-phase three-wire system
1. Test purpose
Detect the signal of the two voltages and two currents of the device under test, and use the test data to understand the real-time voltage amplitude, current amplitude, active power, reactive power, phase, frequency and vector between each parameter of the device under test. The real situation of the relationship; the vector diagram of the four parameters can be displayed on the same screen to determine the operation of the power supply system, and it is convenient to analyze the cause of the fault and the cause of the line loss.
2, test method
Specific wiring: three-phase three-wire equipment test wiring diagram
In the three-phase three-wire system, only three voltage lines are used. The yellow wire is connected to the phase A of the device under test and the phase A voltage terminal of the instrument, and the green wire is connected to the phase B voltage of the device under test and the N phase voltage terminal of the instrument. It is not phase B), the red wire is connected to the C-phase voltage of the device under test and the C-phase voltage terminal of the instrument; A and C two clamp-type current transformers are used to measure the A and C phases of the current of the device under test, after connecting the line Go to the Test Parameters screen to view the measurement results.
(3), waveform display measurement part
1. Test purpose
Through this project, the waveform of each parameter can be displayed, the phase relationship between each parameter (lead or lag) can be understood, the distortion of the waveform can be observed, the cause of the distortion can be analyzed, and the PT and CT can be overloaded.
2, test method
Different wiring according to the wiring method of the device under test:
The equipment of the three-phase four-wire connection method is wired according to Figure 23.
The equipment of the three-phase three-wire connection method is wired according to Figure 24.
After connecting the line, enter the “Waveform Display Interface†to test.
(4) Spectrum analysis and measurement part
1. Test purpose
This function is used to display the voltage parameters of each phase, the histogram of the 1-50th harmonic content of each phase current parameter, the percentage of each parameter (1-64 times) harmonic, the total harmonic distortion and other indicators. Determine the quality of the phase voltage or current power.
2, test method
Different wiring according to the wiring method of the device under test:
The equipment of the three-phase four-wire connection method is wired according to Figure 23.
The equipment of the three-phase three-wire connection method is wired according to Figure 24.
After connecting the line, enter the “Spectrum Analysis Interface†for testing.
(5), voltage harmonic analysis part
1. Test purpose
This function is used to display the value and percentage content of the harmonic content of the three-way voltage parameter 2-64 to judge the quality of the measured voltage signal.
2, test method
Specific wiring: voltage harmonic test wiring diagram
In this project
When using a portable power quality analyzer, the three-phase voltage signal is simultaneously connected. The four colors of yellow, green, red and black of the voltage test line respectively correspond to the four phase lines A, B, C and N of the signal to be tested (when the PT uses the three-wire connection method twice, the voltage of the B phase of the device to be tested) Connect to the Un terminal of the instrument, only use three voltage lines). After connecting the line, enter the “Voltage Harmonics†screen to view the measurement results.
(6) Current harmonic analysis part
1. Test purpose
This function is used to display the value and percentage content of each harmonic content of the three-way current parameter 2-64, in order to judge the quality of the measured current signal power.
2, test method
Specific wiring: current harmonic test wiring diagram
In this project, three current signals are simultaneously connected. Use A, B, C three clamp current transformers to measure the A, B, and C three phases of the current loop of the device under test. (When the device under test is a three-phase three-wire connection, only A and C phases are used. After the line is connected, enter the “Current Harmonics†screen to view the measurement results.
(7) Unbalance measurement part
1. Test purpose
This function is used to display the amplitude of each phase separation voltage and 3 times zero sequence voltage 3U0, zero sequence voltage U0, positive sequence voltage U1, negative sequence voltage U2, voltage unbalance value #u; each phase separation current amplitude and 3 Zero sequence current 3I0, zero sequence current I0, positive sequence current I1, negative sequence current I2, current imbalance value #i. In this way, the influence of voltage and current imbalance on the quality of power supply is evaluated.
2, test method
The specific wiring method is wired according to the connection: unbalance test wiring diagram
Connect the phase A voltage of the device under test with the A phase voltage terminal of the instrument, the green wire to the phase B voltage of the device under test, the phase B voltage terminal of the instrument, the red wire to the phase C voltage of the device under test, and the instrument. C-phase voltage terminal; three clamp-type current transformers are used to measure the A, B, and C three phases of the current of the device under test. After connecting the line, enter the “unbalance†screen to view the measurement results.
Issues to be aware of during the test:
1. Insert the current test clamp before the test. It is forbidden to insert the current clamp socket after clamping the measured signal first. This is equivalent to the secondary open circuit of the current test clamp, which is easy to generate open circuit high voltage and damage the instrument. After the test is completed, remove all current test tongs and then unplug the main unit.
2, test tongs to ensure the accuracy of each channel, should be one-to-one correspondence, the current clamp should be correctly inserted into the only corresponding socket. Exchanging different inputs will reduce the accuracy of the test, but the general test accuracy will not exceed ±2% after the crossover.
3. When connecting the voltage signal, the test line must first be connected to the voltage terminal of the instrument, and then to the voltage terminal of the device under test. After the test is completed, the voltage connector of the device under test must be removed first, and then the instrument side is removed. Voltage line. (This article is especially important, and vice versa may cause a major accident)
The following describes the different test items.
(1) Measurement of electrical parameters of equipment in three-phase four-wire system
1. Test purpose
Detect the three-way voltage and three-way current signals of the device under test, and use the test data to understand the real-time voltage amplitude, current amplitude, active power, reactive power, phase, frequency, and vector between each parameter of the device under test. The real situation of the relationship; the vector diagram of the six parameters can be displayed on the same screen to determine the operation of the power supply system, and it is convenient to analyze the cause of the fault and the cause of the line loss.
2, test method
Specific wiring: three-phase four-wire equipment test wiring diagram
When using the portable power quality analyzer, connect the phase A voltage of the device under test and the phase A voltage terminal of the instrument, the green wire to the phase B voltage of the device under test, and the phase B of the instrument in the three-phase four-wire system. The voltage terminal and the red wire are connected to the C-phase voltage of the device under test and the C-phase voltage terminal of the instrument; the three clamp-type current transformers are used to measure the A, B, and C phases of the current of the device under test, and then enter the test after connecting the line. The "Parameters" screen looks at the measurement results.
(II) Measurement of electrical parameters of equipment in three-phase three-wire system
1. Test purpose
Detect the signal of the two voltages and two currents of the device under test, and use the test data to understand the real-time voltage amplitude, current amplitude, active power, reactive power, phase, frequency and vector between each parameter of the device under test. The real situation of the relationship; the vector diagram of the four parameters can be displayed on the same screen to determine the operation of the power supply system, and it is convenient to analyze the cause of the fault and the cause of the line loss.
2, test method
Specific wiring: three-phase three-wire equipment test wiring diagram
In the three-phase three-wire system, only three voltage lines are used. The yellow wire is connected to the phase A of the device under test and the phase A voltage terminal of the instrument, and the green wire is connected to the phase B voltage of the device under test and the N phase voltage terminal of the instrument. It is not phase B), the red wire is connected to the C-phase voltage of the device under test and the C-phase voltage terminal of the instrument; A and C two clamp-type current transformers are used to measure the A and C phases of the current of the device under test, after connecting the line Go to the Test Parameters screen to view the measurement results.
(3), waveform display measurement part
1. Test purpose
Through this project, the waveform of each parameter can be displayed, the phase relationship between each parameter (lead or lag) can be understood, the distortion of the waveform can be observed, the cause of the distortion can be analyzed, and the PT and CT can be overloaded.
2, test method
Different wiring according to the wiring method of the device under test:
The equipment of the three-phase four-wire connection method is wired according to Figure 23.
The equipment of the three-phase three-wire connection method is wired according to Figure 24.
After connecting the line, enter the “Waveform Display Interface†to test.
(4) Spectrum analysis and measurement part
1. Test purpose
This function is used to display the voltage parameters of each phase, the histogram of the 1-50th harmonic content of each phase current parameter, the percentage of each parameter (1-64 times) harmonic, the total harmonic distortion and other indicators. Determine the quality of the phase voltage or current power.
2, test method
Different wiring according to the wiring method of the device under test:
The equipment of the three-phase four-wire connection method is wired according to Figure 23.
The equipment of the three-phase three-wire connection method is wired according to Figure 24.
After connecting the line, enter the “Spectrum Analysis Interface†for testing.
(5), voltage harmonic analysis part
1. Test purpose
This function is used to display the value and percentage content of the harmonic content of the three-way voltage parameter 2-64 to judge the quality of the measured voltage signal.
2, test method
Specific wiring: voltage harmonic test wiring diagram
In this project
When using a portable power quality analyzer, the three-phase voltage signal is simultaneously connected. The four colors of yellow, green, red and black of the voltage test line respectively correspond to the four phase lines A, B, C and N of the signal to be tested (when the PT uses the three-wire connection method twice, the voltage of the B phase of the device to be tested) Connect to the Un terminal of the instrument, only use three voltage lines). After connecting the line, enter the “Voltage Harmonics†screen to view the measurement results.
(6) Current harmonic analysis part
1. Test purpose
This function is used to display the value and percentage content of each harmonic content of the three-way current parameter 2-64, in order to judge the quality of the measured current signal power.
2, test method
Specific wiring: current harmonic test wiring diagram
In this project, three current signals are simultaneously connected. Use A, B, C three clamp current transformers to measure the A, B, and C three phases of the current loop of the device under test. (When the device under test is a three-phase three-wire connection, only A and C phases are used. After the line is connected, enter the “Current Harmonics†screen to view the measurement results.
(7) Unbalance measurement part
1. Test purpose
This function is used to display the amplitude of each phase separation voltage and 3 times zero sequence voltage 3U0, zero sequence voltage U0, positive sequence voltage U1, negative sequence voltage U2, voltage unbalance value #u; each phase separation current amplitude and 3 Zero sequence current 3I0, zero sequence current I0, positive sequence current I1, negative sequence current I2, current imbalance value #i. In this way, the influence of voltage and current imbalance on the quality of power supply is evaluated.
2, test method
The specific wiring method is wired according to the connection: unbalance test wiring diagram
Connect the phase A voltage of the device under test with the A phase voltage terminal of the instrument, the green wire to the phase B voltage of the device under test, the phase B voltage terminal of the instrument, the red wire to the phase C voltage of the device under test, and the instrument. C-phase voltage terminal; three clamp-type current transformers are used to measure the A, B, and C three phases of the current of the device under test. After connecting the line, enter the “unbalance†screen to view the measurement results.
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