Three Phase Power Quality Analyzer

• Customization: Available
• After-sales Service: Yes
• Warranty: One Year
• Model NO.: SK
• Display: Digital
• Installation: Direct Connected
• Usage: Multi-Functional Energy Meter, Meter for Industry and Home Use
• Electric Equipment: Three-phase Three-wire
• Theory: Electronic Meter
• Type: Energy Meter
• Customized: Non-Customized
• Transport Package: Wooden Box with Foam Inside
• Specification: 320mmx240mmx130mm
• Origin: China
• HS Code: 9030899090
• Production Capacity: 100 PCS/Month
• Package Size: 320.00cm * 240.00cm * 130.00cm
• Package Gross Weight: 20.000kg

Product Description

Preface

Power quality refers to the quality of the AC power supply via the utility grid to the user, which normally means the good or bad situation of the electric energy in transmission line. Power quality problems are mainly caused by the load side of the terminal. For example, impact reactive load will lead to serious fluctuates to power network voltage, and decrease the quality of power supply.

With the development of power electronics technology, on one hand, it brought positive side to the modern industrial energy efficiency and energy conversion. On the other hand, while the power electronic devices are widely used in all walks of life, it also has brought new and more serious damage to the power quality, and has become the main source of harmonic in grid.

The increasing use of rectifiers, frequency control devices, electric arc furnaces, electric railway and a variety of power electronic devices in each distribution system, impact the electricity network or called power pollution. It causes voltage instability, over-voltage, generates harmonics and so on. Harmonic makes efficiency of electricity production, transmission and utilization reduce, so that the electrical equipment will be overheat, vibration and making noise, and insulation aging, shortened life expectancy, and even failure or burned. Harmonics can also cause localized power system an occurrence or series resonant parallel resonance, so that the harmonic content is amplified, resulting in capacitors and other equipment destroyed.

Electrical properties of non-linear, impact resistance and unbalanced of these kind of load, causes serious pollution to the quality of power supply. Thus, eliminating the higher harmonic problem in supply and distribution system has a very positive meaning in improving the power quality issues and ensuring power system security, stability and economic operation.
On the other hand, electrical equipments in modern industrial, commercial and residential users are more sensitive to power quality, and have a higher requirement of quality of power supply. Currently, harmonics, electromagnetic interference, power factor reduction have been tied to the three hazard of the power system.

When it is interfered or contaminated, grid power quality can't reach the national standards, so it has to be targeted on the grid power quality improvement. To understand the actual situation of power quality, you must have the appropriate equipment to test and analysis the actual situation. Counter the domestic condition, our company developed the professional power quality analysis instrument, which is suitable for the country. The following will illustrate the specific performances, parameters, methods of use on the power quality analyzer in detail.

Executive standard,IEC61000-4-30.
 

I. Functions and features

1. Multi-channel testing: Simultaneous measurement of 4 voltage channels and 4 current channels.
2. Electrical parameter measurement: It can measure a variety of electrical parameters at the same time, such as voltage, current, active power, reactive power, phase angle, power factor, frequency, etc.
3. It can measure the voltage harmonic and 2-64th current harmonic content
4. It can measure the 0.5-31.5  Inter-harmonic content of voltage and current
5. It can measure the total harmonic distortion rate of voltage and current
6. Can measure and short-term flicker (Pst), long-term flicker (Plt), voltage fluctuation
7. It can measure positive sequence voltage, negative sequence voltage, zero sequence voltage, voltage unbalance
8. It can measure positive sequence current, negative sequence current, zero sequence current, current unbalance
9. It has the function of measuring transient parameters and the function of recording voltage swells and drops. At the same time, the recording function is automatically started to record the occurrence time of the event and the actual waveforms of the five cycles before and after the occurrence.
10. It has an oscilloscope function, which can display the size and distortion of voltage and current in real-time waveforms, and can zoom in and out of the voltage and current waveforms on the instrument
11. It has a hexagonal diagram display function, which can perform vector analysis of the metering circuit and the protection device circuit, and check the wrong wiring of the metering device; in the three-phase three-wire connection mode, it can automatically judge 48 wiring methods; the automatic calculation function of the supplementary power is convenient to use. The personnel calculate the supplementary power for users with wiring problems.
12. Optional large clamp can be used to measure the transformation ratio and angle difference of low-voltage current transformers
13. Harmonic content can be displayed in the form of a histogram, with good visual effects
14. It has built-in large-capacity data memory, (storage interval 1 second-1000 minutes optional) can store data continuously for more than 18 months at a time interval of 1 minute
15. 10-inch large-screen color LCD monitor 1280×800
16. Capacitive screen touch operation is similar to that of tablet PC and smart phone, easy to learn
17. Support mouse operation, adapt to operators with different habits
18. During harmonic measurement, it can automatically judge whether the harmonic content of each order exceeds the standard according to the national standard and give a prompt, which is clear at a glance
19. It has a national standard query function for harmonic content rate, which can query the allowable value of the national standard

20. It has a frequency measurement range of 42.5Hz-69Hz, capable of measuring 50, 60 power systems
21. Data can be stored in U disk for historical query.
22. It can be equipped with dedicated data analysis and management software to analyze and process the test results, and can grasp the power quality and load periodic changes of the measured point. This is irreplaceable for the power workers to understand the user's power quality and take corresponding processing measures effect
23. The analysis software can generate professional power quality analysis reports in accordance with the requirements of the national standard
24. The instrument has a screen capture function, and the displayed data on any screen can be manually saved in the form of pictures
25. The instrument is small in size, light in weight and easy to carry
26. It has a built-in high-performance lithium-ion battery and automatically enters the power-saving mode, allowing the instrument to work continuously for more than 10 hours without an external power supply, which is convenient for on-site testing
 

II. Technical specifications

 

Project		Data
Number of measurement channels		Four voltage channels, four current channels
Measuring range	Voltage	0-660V
	Current	Small clamp:diameter 8mm,5A/25A(standard) Medium clamp:diameter 50mm,100A/500A(Optional) Large clamp:diameter 125×50mm,400A/2000A(Optional) Rogowski Coil : Ring diameter 250mm, 1000A/5000A(Optional)
	Phase angle	0.000-359.999°
	Frequency	42.5-69Hz
Measuring step	Voltage	0.001V
	Current	0.0001A
	Phase angle	0.001°
	Power	active power 0.01W,reactive power 0.01Var
	Frequency	0.0001Hz
Voltage measurement accuracy		≤0.1%
Current measurement accuracy		≤0.3%
Phase angle measurement accuracy		≤0.1°
Power measurement accuracy		≤0.5%
Frequency measurement accuracy		≤0.01Hz
Harmonic analysis times		2-64 times
Harmonic voltage measurement error		Harmonic content>1% Nominal value:≤1% RD Harmonic content<1% Nominal value:≤0.05%FS
Harmonic current measurement error		Harmonic content>3% Nominal value:≤1% RD Harmonic content<3% Nominal value:≤0.05%FS
Three phase voltage unbalance error		≤0.2%
Three phase current unbalance error		≤0.5%
Voltage fluctuation accuracy		5%
PST measurement time		10min
PLT measurement time		2h
PST/PLT measurement error		≤5%
Screen		1280×800,True color LCD
Charging Power		AC220V±15% Frequency 45Hz-65Hz
Standby timing		≥10h
Host Power		<4VA
Insulation		1) The insulation resistance between the voltage, current input terminal and the housing ≤100MΩ. 2) Withstand 1.5KV (valid value) with power frequency on operating power input and the shell, which lasts one minute.
Working temperature		-20ºC~50ºC
Relative humidity		0-95% No condensation
Size		280mm×210mm×58mm(L×W×H)
Weight		2kg

III. Structure and appearance

(I) Device's appearance

Figure 1. Front view of the instrument
There is a retractable handle on the top of the instrument, and a touch LCD display on the front; all operations are carried out through the touch screen or an external mouse.
 

(II) Interface of the test wiring terminals

Figure 2. Terminal interface
The terminal area is located on the left side of the instrument, as shown in Figure 2, including: voltage input terminals UA, UB, UC, U0, UN; clamp-type current transformer interface (A-phase clamp, B-phase clamp, C-phase clamp, neutral wire Clamp); photoelectric and pulse signal interface

(III) Interface of the instrument auxiliary terminal

Figure 3. Auxiliary terminal interface
The auxiliary terminal area is located on the right side of the instrument, including: instrument working switch, RS232/RS485 interface (used to upload data to the computer), USB interface (used to connect to a USB flash drive, online program upgrades; can also connect to a mouse), charging Interface (when the instrument loses power, it must be charged in time to avoid deep discharge of the battery that affects the battery life. It is best to charge once within two weeks if it is not used for a long time, and it is best to charge more than 6 hours each time).
 

(IV) Aluminum alloy outer packing box

Figure 4. Dimensions of the outer packing box of the instrument

 

IV.  LCD Screen

There are 13 interfaces in total of the LCD screen including 12 functional interfaces and the main menu.
1. Main menu:

Figure 5. Main menu
The main menu interface is shown as Figure 5 when the device is turned on, The date and time are displayed on the upper part of the screen,  The remaining battery power is displayed in the lower right corner of the screen (The user can judge whether the instrument needs to be charged based on this value). In the middle of the screen are 12 function options including Settings, Metrics, Harmonics, BarGraph, Waveform, Phasor, CT_Ratio, History, Events, Screenshots, Disk, Power off. Click the icon to enter the corresponding function interface.

2. "Settings" interface:

Figure 6. Settings interface
The Settings interface is shown in Figure 6,  This interface is used to adjust the data that needs to be determined before the test. It includes: Wiring Mode, Current Input, Logger (Second/Recoder, Start/Stop), PT Ratio, CT Ratio, Rated Voltage, Short Circuit Capacity, Feeding Capacity, Protocol Capacity, Setting Date, Setting Time, Station Name, Line Name , File Name.

1. 1. Wiring Mode: Refers to the wiring connection mode of the device under test, including: three-phase three-wire and three-phase four-wire. Click the corresponding option to select.
   2. Current Input: Refers to the current measurement method, including: 5A clamp measurement, 25A clamp measurement, 100A medium clamp measurement (optional), 500A medium clamp measurement (optional), 400A large clamp measurement (optional) ), 2000A large clamp measurement (optional), a total of 6 options. Click the corresponding option to select.
   3. Second/Recorder: Refers to the time interval for saving test data. The minimum interval is 1 second and the maximum interval is 5000 seconds. When setting, first click the position of the value box to enter the modification state (the keyboard box will automatically pop up at this time), then click the corresponding number to input the required number, and finally click other positions outside the value box to complete the setting.
   4. Start/Stop: Refers to the storage control switch. When "Start" is selected, the storage function is turned on and data storage starts automatically. When "Stop" is selected, the storage function is closed and data storage is stopped. Click the corresponding option to select.
   5. Setting Date: Set the current date (year, month, day). When setting, first click the position of the value box to enter the modification state (the keyboard box will automatically pop up at this time), then click the corresponding number to input the required number, and finally click other positions outside the value box to complete the setting.
   6. Setting Time: Set the current time (hours, minutes, and seconds). When setting, first click the position of the value box to enter the modification state (the keyboard box will automatically pop up at this time), then click the corresponding number to input the required number, and finally click other positions outside the value box to complete the setting.
   7. PT Ratio: Refers to the transformation ratio value of the voltage transformer used by the device under test. When setting, first click the position of the value box to enter the modification state (the keyboard box will automatically pop up at this time), then click the corresponding number to input the required number, and finally click other positions outside the value box to complete the setting.
   8. CT Ratio: Refers to the transformation ratio value of the current transformer used by the device under test. When setting, first click the position of the value box to enter the modification state (the keyboard box will automatically pop up at this time), then click the corresponding number to input the required number, and finally click other positions outside the value box to complete the setting.
   9. Rated Voltage: Refers to the nominal primary voltage value of the device under test. When setting, first click the position of the value box to enter the modification state (the keyboard box will automatically pop up at this time), then click the corresponding number to input the required number, and finally click other positions outside the value box to complete the setting.
   10. Short Circuit Capacity: Short-circuit capacity refers to the apparent power of a three-phase short circuit at a point of interest under the specified operating mode of the power system. It is a characteristic parameter that characterizes the power supply capability of a power system. Its magnitude is equal to the product of the short-circuit current and the rated voltage at the short-circuit. When setting, first click the position of the value box to enter the modification state (the keyboard box will automatically pop up at this time), then click the corresponding number to input the required number, and finally click other positions outside the value box to complete the setting.
   11. Feeding Capacity: The load of the power supply system generally refers to the capacity of the user's step-down transformer. When setting, first click the position of the value box to enter the modification state (the keyboard box will automatically pop up at this time), then click the corresponding number to input the required number, and finally click other positions outside the value box to complete the setting.
   12. Protocol Capacity: It is the maximum power or apparent power applied by the power user and approved by the power supplier to use of the power. When setting, first click the position of the value box to enter the modification state (the keyboard box will automatically pop up at this time), then click the corresponding number to input the required number, and finally click other positions outside the value box to complete the setting.
   13. Station Name: Refers to the name of the substation where the test site is located, used to distinguish the saved results. Direct input through the corresponding number/letter keys. When setting, first click the position of the value box to enter the modification state (the keyboard box will automatically pop up at this time), then click the corresponding number to input the required number, and finally click other positions outside the value box to complete the setting.
   14. Line Name: Refers to the number of the line under test. Used together with "Station Name" to distinguish the saved results. It is composed of numbers and letters, which can be combined arbitrarily..Refers to the number of the line under test. Used together with "Station Name" to distinguish the saved results. It is composed of numbers and letters, which can be combined arbitrarily. When setting, first click the position of the value box to enter the modification state (the keyboard box will automatically pop up at this time), then click the corresponding number to input the required number, and finally click other positions outside the value box to complete the setting..
   15. File Name: Refers to the name of the file where the record is stored. It is composed of numbers and letters, which can be combined arbitrarily. When setting, first click the position of the value box to enter the modification state (the keyboard box will automatically pop up at this time), then click the corresponding number to input the required number, and finally click other positions outside the value box to complete the setting..

3. "Metrics" interface:


Figure 7. Metrics interface
The "Metrics" interface is shown in Figure 7. The data consists of four parts: secondary value, primary value, flicker, and unbalance. The secondary parameter refers to the parameter value directly measured by the instrument measurement channel, including: A, B, C three-phase voltage, current, phase angle, active power, reactive power, apparent power, total power, and N-phase voltage and current. The primary parameter refers to the value of the secondary parameter converted to the primary side of the transformer according to the set voltage transformation ratio and current transformation ratio, It also includes: A, B, C three-phase voltage, current, phase angle, active power, reactive power, apparent power, total power, and N-phase voltage and current. Flicker data includes voltage fluctuations, Pst, and Plt of phases A, B, and C. Comprehensive parameters include: zero sequence voltage and current; positive sequence voltage and current; negative sequence voltage and current; unbalance of voltage and current; measured frequency and total power factor. Click the pause button to lock the current screen for easy reading. Click the Continue button to refresh. Click the back button to return to the main menu..
4. "Harmonics" interface:


Figure 8. Harmonics interface
The "Harmonics" interface is shown in Figure 8. This interface displays the harmonic content of each phase voltage and current signal (from left to right, it shows the voltage and current of each phase of A, B, and C), Among them, the first two rows of data are the voltage or current waveform distortion rate (total harmonic distortion) of each phase and the true effective value of each phase voltage and current; The following table shows the measured value of each content. Among them, the first order is the fundamental wave voltage and current (expressed in actual amplitude), and the following are the values of each harmonics of it expressed in the form of effective value and the percentage of fundamental wave. The data of the 1-63 harmonics are displayed in the form of a table. Users can click the up and down buttons to display different harmonic orders. Click the pause button to lock the current screen for easy reading; Click the Continue button to refresh the data; click the Back button to return to the main menu.
Click the InterHarmonics button at the bottom of the screen to switch to the InterHarmonics test interface, as shown in Figure 9:

Figure 9. InterHarmonics interface
This interface displays the inter-harmonic content of each phase voltage and current signal (from left to right, the voltage inter-harmonic data of each phase A, B, C, and the current inter-harmonic data of each phase A, B, C), 0.5-31.5 inter-harmonic data is displayed in the form of a table. The user can click the up and down buttons to display different harmonic orders. Click the Harmonics button at the bottom of the screen to switch to the Harmonics test interface.
5. "BarGraph" interface
The "BarGraph" interface is shown in Figure 10. This interface displays the harmonic content distribution of phase A voltage, phase B voltage, phase C voltage, phase A current, phase B current and phase C current in the form of a bar graph, The harmonic content columns of adjacent orders are distinguished by different colors, and every 10 colors are a group, and they are displayed in cycles; Because harmonics above the 32th order are generally not used, only the 32nd order is displayed in the histogram.

Figure 10. BarGraph interface
The UA-UB-UC-IA-IB-IC at the top prompts the current measurement channel (the user can change the selected channel by clicking the corresponding radio button), The ordinate scale 0%-30% represents the percentage content of each harmonic component, and the fundamental content always corresponds to the 100% scale (when the harmonic content of all orders is less than 30%, it will be enlarged and displayed, that is, 30% is taken as full Scale. When there is more than one harmonic content greater than 30%, it is displayed on the normal scale, that is, 100% is used as the full scale), The abscissa indicates the number of harmonics, and the value on the right shows the total harmonic distortion rate THD, effective value and the value of each harmonic from 1 to 64 (you can change the display by clicking the range button and selecting the corresponding range value scope).
Click the pause button to lock the current screen for easy reading; click the continue button to refresh the data; click the return button to return to the main menu.
6. "Waveform" interface
The "Waveform" interface is shown in Figure 11. In this interface, the actual waveform of each currently measured analog signal can be displayed. The waveform is refreshed in real time, which can intuitively display the distortion of the measured signal (whether it is distorted, whether it is truncated), The current display shows all the voltage and current waveforms of phases A, B, C, and zero.

Figure 11. Waveform interface
The 8 multiple option buttons on the right are the display channel selection buttons. The user can make the screen display different parameters by clicking the corresponding check button. Any combination of 8 channel display modes; It can be used as a simple oscilloscope. At the bottom of the screen, the actual measured effective values of the voltage and current of each phase A, B, C, and N are displayed. The user can click the pause button to lock the current screen for easy reading. Click the Continue button to refresh the data; click the Back button to return to the main menu.
7. "Phasor" interface


Figure 12. Phasor interface
The "Phasor" interface is shown in Figure 12, The measured vector hexagon diagram of the device under test is displayed on the left side of this interface, The right side of this interface displays the amplitudes of the three-phase voltage (two-phase for two components), the amplitude of three-phase current (two-phase for two components), and the relative phase angles of other quantities with reference to Ua(Because the measurement department and the protection department have different definitions of the angle rotation direction, we give two different definition angles. The measurement department defines clockwise as a positive angle, and the protection department defines clockwise as a negative angle).
The wiring judgment result of the three-phase three-wire metering device is located at the bottom of the screen, According to the load characteristics (weak inductance, strong inductance, weak capacitance) of the site, it can visually show whether the wiring of the three-phase metering device is correct, and give the electricity metering correction value of the wrong wiring. For three-phase four-wire metering devices, since the judgment is relatively simple and the correct wiring is not unique, wiring analysis is not provided here..
Click the pause button to lock the current screen for easy reading. Click the Continue button to refresh the data. Click the back button to return to the main menu.
8. "CT Ratio" interface

Figure 13. CT Ratio interface
Use this function to perform on-site testing of low-voltage current transformer transformation ratio and angle difference. It can be seen in Figure 13: The screen prompts that the clamp meters that should be used for secondary current and primary current tests are: a 5A small clamp meter of phase A for secondary current, and a medium or large clamp meter of phase C for primary current. The clamp meter cannot be used wrongly. Note that the primary current must be measured with a medium-sized clamp meter or a large-sized clamp meter, otherwise the current range of the instrument may be exceeded. The parameter setting should be set according to the range of the clamp meter used by the primary current. The bottom shows the primary current, secondary current, measured transformation ratio, 5A equivalent transformation ratio, 1A equivalent transformation ratio, and the angle between the primary current and the secondary current.

9. "History" interface

Figure 14. History-Open File
To enter the "History" interface, you must first select the record file to be consulted, Click the Open File button in the upper right corner, and the interface shown in Figure 14 will appear, List of all stored files is displayed, After clicking to select the file name to be viewed, click the Open button, and the interface shown in Figure 15 will appear..
The History-record access interface is shown in Figure 15. Five optional form columns are displayed at the bottom: electrical parameters, harmonics[1-16], harmonics[17-32], harmonics[33-48], harmonics[49-64].

Figure 15. History-Record View
Press the corresponding button to view different form data, This figure shows the electrical parameter column, the left side shows the electrical parameters at a certain historical moment, including: A, B, C three-phase voltage, current, phase angle, active power, reactive power, apparent power, voltage fluctuation, PST, PLT, zero sequence voltage, zero sequence current, positive sequence voltage, positive sequence current, negative sequence voltage, negative sequence current, voltage unbalance, current unbalance; The middle part shows the vector diagram and the angle of each vecto; On the right is the record entry adjustment button, including fast adjustment (jump 100 items forward and backward), middle adjustment (jump 10 items forward and backward), and slow adjustment (jump 1 item forward and backward)..
10. "Events" interface
The instrument can capture transient voltage changes and start recording, It can record the waveforms of five cycles before and after the event. After entering the swell and descent interface, first click the open record button in the upper right corner. At this time, the screen will display the record of the last event, the top shows the time of the event, and the bottom shows the record playback. On the right is the record entry adjustment button, which has fast adjustment (10 items forward and backward) and slow adjustment (1 item forward and backward). Click the delete all button to delete all recorded events. In order to avoid accidental deletion, the instrument gives a delete confirmation prompt. The interface shown in Figure 17 appears, if you confirm the deletion, click the Yes button, otherwise click the No button to cancel the operation..

Figure 16. Events-Record View

Figure 17. Events-Record delete
11. "Screenshots" interface
The Screenshots interface is used to view screenshots.
The Screenshots picture browsing interface is shown in Figure 18:
In this function, you can view the pictures saved in the screenshot. Click the Export button to export the picture via U disk.
When you select the Delete All button, a delete confirmation prompt appears. As shown in Figure 19, select Yes to confirm the deletion of all screenshot files, and select No to abort the deletion operation.


Figure 18. Screenshots-Picture browsing interface

Figure 19. Screenshots-delete prompt

12. "Disk" interface
This interface is used to transfer the data of the built-in large-capacity data storage card to the U disk, The interface displays the details of the files stored in the internal large-capacity memory card of the instrument, insert a U disk under this interface, When the U disk symbol is displayed at the top, click the Export button to transfer all the recorded files to the U disk. When the internal memory card stores too many files and the capacity is insufficient, click the Delete All button to empty the memory card, Warning: After confirming that the files are normally copied and exported, you can choose to delete the files to avoid the loss of useful data files.


Figure 20. Disk interface

13. "Power off" button
The Power off button is used to close the instrument software system. Click this button and a prompt box as shown in the figure appears:

Click the "Yes" button to close the software system, and click the "No" button to return to the running interface.


 

V. Usage

The instrument is equipped with a five-core voltage testing line and four current test clamps (can be equipped to six as required). Voltage test lead is used to access to the measured voltage signal. When testing with current clamp in the field, each current clamp corresponds to a clamp connector, non interchangeable, otherwise it will affect test accuracy. There's a roundel sticker in the middle of each clamp, exhibiting phase and polarity of the clamp (The superscript N end is current outflow end. Pay attention to the polarity on use of wiring, because reversal would affect the test results).
Should be noted during the testing:
1. Intercalate the current test clamp before testing. Clip testing signal before intercalating the current test clamp is strictly prohibited. It's equivalent to open circuit on the secondary side of current test clamp, which is prone to a high-pressure of open circuit and damage the instrument. Take off all current test clamp and then unplug connected to the host after the test is completed.
2. To ensure the accuracy of each channel, the test clamp should be one-to-one correspondence, which means properly inserting each current clamp to the corresponding outlet. Exchanging different input socket will reduce accuracy of the test, but it generally does not exceed the measurement accuracy of ± 2% after crossing.
3. The test line must access to the voltage terminal of the instrument when accessing to the voltage signal, and then access to the voltage terminal of the device under test; You must take off the voltage connector of the device under test after the test is completed, and then remove the voltage lines on instrument side. (This provision is particularly important, or it may cause a major accident)
Here's illustration about different test items.


 

(I) Measurement of parameters of three-phase four-wire connection mode devices

1. Purpose for testing
Detect Three-phase voltage and three-phase current signals of the device under test. Get to know real-time voltage magnitude, current amplitude, active power, reactive power, phase, frequency of the device under test, and real situation of vector relationship between the various parameters through the test data; Vector graphics of six parameters can be displayed on one screen, in order to determine the operation condition of the power supply system, and to facilitate analysis of failure causes and reasons for line losses.
2. Test method

Figure 21. three-phase four-wire connection mode devices' test wiring diagram
In the three-phase four-wire connection mode, use the red wire to connect the A-phase voltage of the device under test and the A-phase voltage terminal of the instrument, and the yellow wire to connect the B-phase voltage of the device under test and the B-phase voltage terminal of the instrument, and the blue wire to connect The C-phase voltage of the device under test and the C-phase voltage terminal of the instrument, and the black wire connect the N-phase voltage terminal of the device under test and the N-phase voltage terminal of the instrument. 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 wires, enter the "Electrical Parameters" screen to view the measurement results.

(II) Measurement of parameters of three-phase three-wire connection mode devices

1. Purpose for testing
Detect two-phase voltage and two-phase current signals of the device under test. Get to know real-time voltage magnitude, current amplitude, active power, reactive power, phase, frequency of the device under test, and real situation of vector relationship between the various parameters through the test data; Vector graphics of four parameters can be displayed on one screen, in order to determine the operation condition of the power supply system, and to facilitate analysis of failure causes and reasons for line losses.
2 Testing method

Figure 22. three-phase three-wire connection mode devices' test wiring diagram
In the three-phase three-wire connection mode, use the red wire to connect the A-phase voltage of the device under test and the A-phase voltage terminal of the instrument, and the yellow wire connect the B-phase voltage of the device under test and the B-phase voltage terminal of the instrument, and the blue wire to connect The C-phase voltage of the device under test and the C-phase voltage terminal of the instrument. A and C-phase clamp-type current transformers are used to measure the A and C two phases of the current of the device under test. After connecting the wires, enter the "Electrical Parameters" screen to view the measurement results.

 

(III) Measurement of waveform display section

1. Purpose for testing:
You can view waveform of each parameter, understand the phase relationship between each parameter (lead or lag), observe distortion situation of waveform, analyze the causes for distortion generated, and whether the PT and CT are overload through this project.
2. Testing method:
The user should perform different wiring according to the different wiring methods of the device under test;
 The equipment with three-phase four-wire connection shall be connected according to Figure 21;
The equipment of the three-phase three-wire connection mode is connected according to Figure 22.
Go to the "Waveform Display" interface for testing after wiring.

(IV) Measurement of spectrum analysis section

1. Purpose for testing
This function is used to display histogram of 1-50 times harmonic content of the parameters of each phase voltage, each phase current as well as the percentage of content of (1-64 times) harmonic in each parameter, and total harmonic distortion and other indicators. So that you can determine whether power quality of this phase voltage or current is good or bad.
2. Testing method
The user should perform different wiring according to the different wiring methods of the device under test;
The equipment with three-phase four-wire connection shall be connected according to Figure 21;
The equipment of the three-phase three-wire connection mode is connected according to Figure 22.
Go to the "Spectrum Analysis Interface" for testing after wiring.
 

(V) voltage and current harmonic analysis part

1. Purpose for testing
This function is used to display the numerical value and percentage content of each harmonic content of the three-channel voltage and current parameters 2 to 64, so as to judge the power quality of the measured voltage and current signals.
2. Test method
Perform different wiring according to the wiring method of the device under test:
The equipment with three-phase four-wire connection shall be connected according to Figure 21;
The equipment of the three-phase three-wire connection mode is connected according to Figure 22.
Go to the " Harmonic test" for testing after wiring.

 

(VI) Wiring part of CT ratio test

1. Test purpose
This function is used to test the ratio and polarity of the low-voltage current transformer, and to judge the quality of the current transformer and whether the wiring polarity is correct.
2. Test method
The specific wiring is shown in Figure 23


Figure 23. Wiring diagram of CT ratio test
Use a small clamp for phase A to measure the secondary side current of the CT under test, and use a medium or large clamp for phase C to measure the primary side current of the CT under test.
Attention: In the parameter setting, set the current input option to the corresponding channel of the clamp used to test the primary side current; after connecting the wire, enter the "CT ratio" screen to view the measurement result.
 

VI. Battery Maintenance and Charging

The instrument uses a high-performance lithium-ion rechargeable battery as an internal power supply. Operator can not easily replace other types of batteries, in case causing damage to the instrument for electrical level is not compatible.
The instrument should be promptly charged, in case that deep discharge battery affects the battery life.
Charge it everyday if it's possible under normal use (Better to charge it once a month if not used in the long-term), so as not to affect the use and battery life. Charging time should be at least six hours every time. The instrument can be continuous charging due to the internal charging protection function.
Each time when you remove the battery from the instrument, battery protection board inside the instrument will automatically enter protection status. Re-insert the battery, and the instrument can not work directly, you need to give power to the charger to rescind the protection state before working properly.

 

VII. Attention

1. Do not touch the metal parts of the test line during measurement process to avoid electrical injury.
2. Measurement wiring must operate in strict accordance with the instructions to ensure personal safety.
3. Better use of power outlet with ground.
4. Do not work in the case of excess voltage and current limits.
5. Each clamp must be accordance with the corresponding socket on the panel, otherwise it will affect the test results.
6. You must follow the principles of accessing the instrument before the device under test when connecting to the instrument, and the principles of removing the device under test before the instrument when splitting the instrument for voltage line and clamp.
7. Pay attention that you must turn off the power supply switch whenever testing is finished, because sometimes the LCD