First, the main function 1. The use of large LCD display, can be measured at the same time, the same screen display U1, I1, φ 1, U2 , I2, φ 2, U3, I3, φ 3, φ U1U2, φ U2U3, φ U3U1, φ I1I2, φ I2I3, φ I3I1 and U1F total of 16 parameters. A, LYXW9000 three-phase clamp phase voltammetry characteristic function table 1. Three-way voltage and three-way current vector are displayed on the same screen. For complex differential protection devices, multiple clamps can be used to make multiple measurements and a complete hexagon can be drawn. 2. The use of clamp-type current transformer wiring, without disconnecting the current loop, is safe and convenient. 3. Vector analysis of complex protection devices can be performed to determine if the wiring is correct and give the correct wiring diagram for comparison. 4, can conduct regular electrical parameters test, while displaying the three-phase voltage, three-phase current, three-phase active power, three-phase apparent power, three-phase phase angle; and direct reading converted to the voltage amplitude of the primary side of the transformer, Current amplitude, power value. 5, can be three-phase three-wire high-voltage measurement device error wiring check, 48 kinds of three-phase three-wire wiring can be analyzed and judged directly to give analysis results; investigate and maliciously change metering means of electricity theft, effectively avoid the loss of electricity costs. 6, can carry on the harmonic analysis of the signal measured on the spot, can analyze the content of 2 - 50 times of each harmonic, automatically calculate the total harmonic distortion. 7, large-screen, high-brightness color LCD display, full-character graphical menus and operating tips to achieve a friendly man-machine dialogue, silicone touch keys to make the operation more comfortable, feel better, wide temperature LCD, with brightness adjustment, to adapt to the winter and summer Seasonal environment application. 8, large-capacity lithium battery power supply, continuous work up to 8 hours. 9. The user can save the test data in the form of records at any time for centralized management, filing, and review, and can store more than 200 sets of data. 10. The saved records can be uploaded to the back office management computer for comprehensive analysis and review. 11, with the calendar, clock function, real-time display of the test work carried out on the date and time. 12, small size, light weight, easy to use on the scene. 13, reserved USB interface, available instruments can replace USB and other removable storage devices. Second, LYXW9000 three-phase clamp phase volt-ampere meter technical indicators Input characteristics Voltage channel number: 3 channels Voltage measurement range: 0~450V Voltage display digits: 6 digits Current channel number: 3 channels Current measurement range: 0~10A Current display digits: 6 digits Phase measurement range: - 180 ° ~ + 180 ° Number of harmonic analysis: 2 to 50 times Accuracy Voltage: ± 0.2% Current, power: ± 0.5% Phase angle: ± 2 ° Harmonic voltage content measurement error: ≤ 0.3 % Harmonic current content rate measurement error: ≤ 0.5 % Working temperature: - 15 °C ~ + 40 °C Charging power supply: AC 160V~260V Insulation: â‘´, voltage, current input terminal housing insulation resistance ≥ 100M?. (2) The input end of the working power source withstands the power frequency 2KV (effective value) between the housings and lasts for 1 minute. Volume: 250mm × 160mm × 60mm Weight: 1.8Kg Third, LYXW9000 three phase clamp type phase volt-ampere meter structure appearance (a), external dimensions and panel layout The instrument looks squarely as shown in Figure 1: Figure I. Instrument front view Above the front of the instrument is a liquid crystal display, the bottom is the button area, the top is the wiring part, including: four voltage input terminals UA , UB , UC , UN ; three current input interfaces ( A phase current clamp interface Ia , B phase current clamp Interface Ib , C phase current clamp interface Ic ). The external interface of the instrument is on the right side (see Figure 2). When the rear bracket is opened, the interface part can be exposed, including the following three parts: 232 serial port (used to upload saved data to the computer); can also be used to update the program; Note: This interface and the computer must be connected with a special equipped with a dedicated communication cable, ordinary serial line is not suitable for the use of this interface. The charger interface is used to connect the charger. When the power of the instrument is insufficient, the charger is connected to this interface to charge the instrument. The USB interface can be connected to the computer through a dedicated data cable, and the memory card in the instrument can be used as a large-capacity memory. The side view is shown in Figure 2 on the right. Figure 2. Right view of the instrument The outer dimensions of the outer box of the instrument are shown in Figure 3: Figure 3, outside the box (B), keyboard operation The keyboard has a total of 30 keys, namely: switch, store, query, set, switch, ↑, ↓, â†, →, à , exit, self-test, help, number 1 , number 2 ( ABC ), number 3 ( DEF ) , number 4 ( GHI ), number 5 ( JKL ), number 6 ( MNO ), number 7 ( PQRS ), number 8 ( TUV ), number 9 ( WXYZ ), number 0 , decimal point, #, auxiliary functions built F1 , F2 , F3 , F4 , F5 . The key functions are as follows: Switch key: It is used to control the power on and off of the instrument. Use: Hold down this key for more than 2 seconds, then release it. ↑, ↓, â†, → keys: Cursor movement keys; used in the main menu to move the cursor to point to a function menu, press the confirmation key to enter the corresponding function; in the parameter setting function screen state, the up and down keys Used to switch the current options, left and right keys to change the value. In addition, ↓ can also be used to display subdirectory menus. Ø key: confirm key; in the main menu, press this key to display the menu subdirectory. In the subdirectory, press this key to enter the selected function. In addition, when you enter certain parameters, this key determines the start of input and End the input. Exit key: Back key, press this key to return to the main menu directly. Storage key: Applied under the interface of differential analysis function to store the test result in the form of record. Query key: Used to browse the stored records. Set key: keep function, not used temporarily. Switch key: keep function, temporarily not use. Self-test key: used to burn fonts during instrument debugging. This feature is not required for users. Help key: Used to display help information. Numeric (character) key: Input for parameter setting (numeric or character can be input). Decimal point key: Used to enter a decimal point when setting parameters. # key: reserved function, temporarily not used. F1 , F2 , F3 , F4 , F5 keys: auxiliary function keys (shortcut keys). Used to quickly enter the auxiliary function interface or implement the corresponding function of prompt information prompt. Fourth, the liquid crystal interface The liquid crystal display interface mainly has twenty screens, including a main menu, four pull-down menus and seventeen function interfaces: 1 . main menu: When the power is turned on, the interface in Figure 4 is displayed. The top line of the screen is displayed as various function menus, including four options: test analysis, power quality, data management, and system calibration. Select â†, → keys to change the current options; select ↓ key or confirm key to display the corresponding pull-down menu, press the OK key to enter the corresponding function test and settings; the lower right corner of the screen shows the built-in rechargeable battery voltage amplitude and remaining power Percentage, the user can use this value to determine whether the instrument needs to be charged; the right side shows the current real-time date and time. 2 . Test Analysis drop-down menu: The test analysis drop-down menu is shown in Figure 5, among which there are seven functional options, namely: parameter settings, secondary parameters, high-pressure parameters, low-pressure parameters, six-clamp differential, double-clamp differential, and three-wire measurement; You can change the currently selected item. Press the OK key to enter the corresponding function test and settings, press the Exit key to return to the main menu. 3 . Power quality drop-down menu: The test analysis drop-down menu is shown in Fig. 6. There are four function options: waveform display, spectrum analysis, voltage harmonics, and current harmonics; press ↑↓ key to change the currently selected item. Press the OK key to enter the corresponding function test and settings, press the Exit key to return to the main menu. 4 . Data Management drop-down menu: Figure 7, data management drop-down menu The data management pull-down menu is shown in Figure 7. There are three function options: record query, online communication, and help file; press ↑↓ key to change the currently selected item. Press the OK key to enter the corresponding function test and settings, press the Exit key to return to the main menu. 5 . System calibration drop-down menu: Figure 8, system calibration drop-down menu The system calibration drop-down menu is shown in Figure 8. There are three function options: time calibration, gain calibration, and number query; press ↑↓ to change the currently selected item. Press the OK key to enter the corresponding function test and settings, press the Exit key to return to the main menu. 6 . Test Analysis - Parameter Settings Interface Figure IX, parameter settings The parameter setting interface is shown in Figure 9. This screen is used to adjust the data that needs to be determined before the test. Including: high-voltage PT transformation ratio, low-pressure PT transformation ratio, high-pressure CT ratio, low-pressure CT ratio, transformer group, high-voltage CT connection, low-voltage CT connection, substation name, transformer number, storage file name. High-voltage PT transformation ratio: refers to the transformer ratio of the transformer's high-voltage side voltage transformer ratio. The input method is: Press the confirmation key to make the number red, then press the corresponding number key to input data, and then press the confirmation key to finish. Low-voltage PT transformation ratio: refers to the ratio of the voltage transformer of the low-voltage side of the transformer under test. The input method is: Press the confirmation key to make the number red, then press the corresponding number key to input data, and then press the confirmation key to finish. High-voltage CT transformation ratio: refers to the ratio of the transformer's low-voltage side current transformer ratio. The input method is: Press the confirmation key to make the number red, then press the corresponding number key to input data, and then press the confirmation key to finish. Low-voltage CT transformation ratio: refers to the transformer ratio of the transformer's low-voltage side current transformer. The input method is: Press the confirmation key to make the number red, then press the corresponding number key to input data, and then press the confirmation key to finish. Transformer group: refers to the connected group of transformers under test. Including methods: Y/Y , Y/D1 , Y/D5 , Y/D11 and so on. Use the ↠and → keys to switch between several modes and select the desired mode. This parameter must be set correctly when performing differential wiring analysis; otherwise, the standard vector diagram will be incorrect. High-voltage CT connection method: refers to the method of connecting the current transformer of the transformer high-voltage side. There are Y and â–³ two ways. Use the ↠and → keys to switch between several modes and select the desired mode. Low-voltage CT connection method: refers to the connection method of the current transformer on the low-voltage side of the transformer under test. There are Y and â–³ two ways. Use the ↠and → keys to switch between several modes and select the desired mode. Substation name: The name of the substation at the test site used to distinguish the saved results. Consists of numbers and letters and can be combined in any combination. Enter directly via the corresponding number / letter key. Transformer number: It refers to the number of the tested transformer. Used with the Substation Name Item to distinguish the saved results. Consists of numbers and letters and can be combined in any combination. Enter directly via the corresponding number / letter key. Store File Name: Record the stored file name. Does not work temporarily. 7 . Test Analysis - Quadratic Parameter Interface Figure 10, quadratic parameters The quadratic parameter interface is shown in Fig. 10. The left side of the interface shows the real-time vector diagram of the three-phase voltage signal and the three-phase current. The right side shows the voltage and current amplitudes and the phase angle relative to the reference reference signal. The reference reference is automatically selected. When Ua has a signal ( Ua>10V ), Ua is the reference, and the phase angles of other parameters are the angles with Ua . When Ua has no signal ( Ua<10V ), Ia is preferred as the reference. With reference to the reference, the phase angles of other parameters are the angles with Ia ; when Ua and Ia have no signal ( Ua<10V , Ia<5mA ), only the amplitude will be displayed, and all the phase angles are not displayed. In this screen, press the F1 key to lock the screen (do not refresh), and then press the F2 key to unlock the data and start refreshing. The next line at the bottom of the screen prompts for possible actions. 8 . Test Analysis - High Pressure Parameter Interface Figure XI. High-pressure parameters The high-voltage parameter interface is shown in Figure 11. The first line of this interface shows the precautions for wiring (the voltage line is connected to the PT outlet of the high-voltage side of the sample, and the current line is connected to the CT outlet of the high-voltage side of the sample ); The measured data of the transformer high-voltage side to be measured include: three-phase voltage, three-phase current, three-phase power, three-phase phase angle, and total power; at the same time, it shows that the transformer ratio and current transformer change according to the input high-voltage side voltage transformer. Transformer's primary data converted from the ratio: including primary three-phase voltage (secondary voltage amplitude multiplied by high-side PT transformation ratio) and primary three-phase current (secondary current amplitude multiplied by high-side CT ratio) First, three-phase power (multiple of secondary power multiplied by the product of PT and CT ratio of high-pressure side ), a three-phase phase angle, and total primary power; Through this interface, you can directly observe the primary and secondary voltages of the high-voltage side of the test object. Current, power, and power data are used to monitor and analyze the load. In this screen, press the F1 key to lock the screen (do not refresh), and then press the F2 key to unlock the data and start refreshing. The next line at the bottom of the screen prompts for possible actions. 9 . Test Analysis - Low Pressure Parameter Interface Figure 12. Low pressure parameters The low-pressure parameter interface is shown in Figure 12. The first line of this interface shows the precautions for wiring (the voltage line is connected to the PT outlet of the low-voltage side of the tested product , and the current line is connected to the CT outlet of the low-voltage side of the sample ); The measured data of the measured low-voltage side of the transformer include: three-phase voltage, three-phase current, three-phase power, three-phase phase angle, and total power; at the same time, the input voltage ratio of the low-voltage side transformer and the current transformer change are also displayed. The value-converted transformer primary data: including a three-phase voltage (secondary voltage amplitude multiplied by the low-voltage side PT transformation ratio) and a primary three-phase current (secondary current amplitude multiplied by the low-voltage CT ratio) First, three-phase power (second power multiplied by the product of PT , CT ratio of low-voltage side ), a three-phase phase angle, a total power; Through this interface, you can visually observe the primary and secondary voltage of the low-voltage side of the test product. Current, power, and power data are used to monitor and analyze the load. In this screen, press the F1 key to lock the screen (do not refresh), and then press the F2 key to unlock the data and start refreshing. The next line at the bottom of the screen prompts for possible actions. 10 . Test Analysis - Standard Vector Interface The standard vector interface is shown in Figure 13: Figure 13. Standard Vector The figure shows: the left side is the standard vector diagram; the right side of the screen is the phase angles of the phase currents of the high- and low-voltage side phases in the standard wiring (all the phase angles are the test results with Iah as the reference). The next line at the bottom of the screen prompts for possible actions. 11 . Test Analysis - Dual Forceps Differential Interface Figure 14: Double clamp differential Double clamp differential interface is shown in Figure 14. This interface is the use of double clamp method for differential protection device wiring analysis, using two clamp current meter to measure the phase of the measured protection device current in turn, and then draw a single parameter vector map, when all the tests are completed, The test is over. The left side of the figure is a test prompt: Use the auxiliary function keys F1 - F5 to lock Ibh , Ich , IaL , IbL , IcL several kinds of parameters, draw the corresponding vector, the right side is the actual drawn vector. The lower side of the vector diagram corresponds to each parameter. Press <memory> key saves the results after the test. 12 . Test Analysis - Three-Wire Metering Interface Figure XV, three-line measurement The three-wire analysis interface is shown in Figure 15. This interface is used to analyze the wiring of the three-phase three-line high voltage metering device. The figure shows: the left side is the display of three-phase three-wire vector, and the four parameters of three-phase and three-wire are displayed in the form of vector diagram ( Uab , Ucb , The phase relationship between Ia and Ic can also be used to decompose the phase voltage Ua , Ub , Uc according to the relationship of two voltage parameters (the three quantities are virtual and do not actually exist); all parameters are referenced to Uab . For benchmarking, we set the initial phase angle of Uab to 330 °, and the phase angles of other parameters are based on this to calculate the corresponding phase angle. The right side shows the phase angle between each parameter and the reference reference; the lower side is the wiring determination result, including 48 kinds of wiring modes (in the analysis results: the first line of voltage determination results, the positive sequence represents the voltage phase sequence is positive, otherwise The negative sequence will be displayed; Uab Ucb indicates that the two voltages are Uab and Ucb respectively ; the second line of the analysis result is the current determination result, the positive sequence represents the current phase, and the + Ia + Ic represents the polarity of the AC two-phase current. Don't be correct.) , can analyze and give the judgment result. The next line of display screen prompting line is visible in the figure. The prompt line prompts the operator to press ↑↓ button to change the range of power angle ( normally, the power angle range is -5 ° ~ 55 °, which indicates the power The normal power angle range of the system is inductive load. After the inductive load exceeds the permissible range, capacitance compensation is used to make it smaller, so as to reduce the generation of reactive power. When over-compensation causes capacitive load, it should be selected at this time. The power angle range is - 65 ° to - 5 ° ) to accurately determine the type of wiring error. In this screen, press the F1 key to lock the screen (do not refresh), and then press the F2 key to unlock the data and start refreshing. The next line at the bottom of the screen prompts for possible actions. 13 . Power Quality - Waveform Display Interface Figure 16 Waveform Display In this screen, the current actual waveforms of each measured analog quantity can be displayed. The waveform can be refreshed in real time, and the distortion of the signal under test can be visually displayed (whether or not it is distorted and whether it is truncated). The waveforms currently displayed are Ua and Ia . ↑ ↓ keys with different phases respectively to switch; can be switched to the B-phase voltage, current waveforms, C phase voltage, current, a, B, C all three phases of voltage and current waveforms. Can be used as a simple oscilloscope. The next line at the bottom of the screen prompts for possible actions. 14 . Power Quality - Spectrum Analysis Interface Figure 17. Spectrum Analysis The spectrum analysis interface is shown in Figure 17. This screen shows the A- phase voltage, B- phase voltage, C- phase voltage, A- phase current (tested with Ia ), B- phase current (tested with Ib ), and C- phase current (tested with Ic ) in the form of a histogram. Harmonic content distribution histogram. The UA-UB-UC-IA-IB-IC prompts the current measurement channel (the ↠and → keys can be used to change the selected channel). The ordinate scale of 0%-10% indicates the percentage content of each harmonic component. The fundamental wave content Always correspond to 100 % scale (When all the harmonic content is less than 10% , zoom display, ie, 10% as full scale; when there is more than 10% harmonic content , display with normal scale, That is, 100% is used as the full scale. 0-30 on the abscissa indicates the number of harmonics, and the right-hand value indicates the THD , rms, and 32th harmonics. The distortion-free signal should show the first harmonic (fundamental wave). With Ua, Ub, Uc three voltage channels and Ia, Ib, Ic three test current path is measured. The next line at the bottom of the screen prompts for possible actions. 15 . Power Quality - Voltage Harmonic Interface Figure 18, voltage harmonics This screen shows the harmonic content of each phase voltage signal (from left to right, A , B , and C phase voltages), where THD is the voltage waveform distortion rate of each phase (that is, total harmonic distortion), RMS For each phase voltage rms value, 01th is the fundamental voltage (expressed by the actual amplitude), followed by the values ​​of the other harmonics, expressed in terms of the effective value and the percentage of the fundamental wave, in the form of The form displays 1-64 voltage harmonics. The 低 key can be used to switch the low 16 times ( 01 - 16 ) and low 16 times ( 17 - 32 ), 16 times ( 33-48 ) high, and 16 times ( 49-64 ) high harmonic content. 16 . Power Quality-Current Harmonic Interface Figure 19. Current harmonics This screen shows the harmonic content of each phase current signal (from left to right, A , B , C phase currents), where THD is the current waveform distortion rate of each phase (that is, total harmonic distortion), RMS For each phase of the current rms value, 01th is the fundamental current (expressed by the actual amplitude), followed by the values ​​of the other harmonics, expressed in terms of the effective value and the percentage of the fundamental wave, in the form of The form displays 1-64 current harmonics. You can use the ↑↓ key to switch between Low 16 ( 01-16 ) and Medium Low 16 ( 17-32 ), Medium High 16 ( 33-48 ), and High 16 ( 49-64 ) harmonic levels. 17 . Data Management - Record Query Interface Figure 20, record query The record query screen is shown in Figure 20. This screen can consult the saved differential analysis test record. The next line at the bottom of the screen prompts for possible actions. 18 . Data Management - Online Communication Interface Figure 21, online communication The connection communication interface is shown in Figure 21. This function screen can upload test records saved in the instrument memory to the back-end management computer. 19 . Data Management - Help File Interface Figure 22. Help file The help file interface is shown in Figure 22. This function screen is used to help the instrument. This information can be updated at any time. 20 . System Calibration - Time Calibration Interface Figure 23, time calibration The time alignment interface is shown in Figure 23. This function screen is used to adjust the date and time of the current internal clock of the instrument. The next line at the bottom of the screen prompts for possible actions. 21 . System Calibration - Gain Calibration Interface This interface is used to adjust the accuracy of the instrument before going out. No instructions are provided here. 22 . System Calibration - Numbering Query Interface Figure 24, numbering The numbering interface is shown in Figure 24. This interface is used to query the serial number of the instrument. You must know the serial number of the instrument when you upgrade the program. Otherwise, the upgrade cannot be performed. V. How to use The tester is equipped with a 4- core voltage test line and three current test clamps. The voltage test line is used to access the measured voltage signal, in which the A phase with the yellow wire connected to the voltage, the B phase with the green wire connected to the voltage, and the C phase with the red wire connected to the voltage ; each pincer corresponds to a clamp meter interface, and cannot mutually Change, otherwise it will affect the test accuracy, each clamp table has a circle label in the middle, showing the phase and polarity of the clamp meter ( the end of the standard N is the outflow end of the current, in the use of wiring to pay attention to the polarity, reverse Will affect the test results). Problems to pay attention to during the test: 1 , to insert the current test clamp before testing, it is strictly forbidden to insert the current clamp after inserting the test wire. This is equivalent to the secondary open circuit of the current test clamp, which will easily produce open circuit high voltage and damage the instrument. After the test is completed, remove all current test clamps and unplug the plug connected to the host. 2. For the accuracy of each channel, the test pliers should correspond one by one, and each current clamp must be correctly inserted into the corresponding socket. Exchange of different inputs will reduce the test accuracy, but the general test accuracy is within ± 2% . 3 , when the voltage signal is connected to the test line must first receive the instrument's voltage terminal, and then receive the voltage terminal of the device under test; after the test is completed, you must first remove the voltage connector of the device under test, and then remove the instrument side The voltage line. (This is particularly important, but it may cause major accidents.)
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2. True rms voltage and current measurement, five-digit voltage display, and current four-digit display. The resolution of the voltage measurement is 10 mV and the highest resolution of the current measurement is 0.1 mA . The voltage and current over-range " OVER " symbol indicates.
3. The measured voltage in the frequency range of 45.00 ~ 65.00 Hz, resolution of 0.01 Hz.
4. measuring the phase between UU, U- I, I- I in the range of 0.0 ~ 360.0 °, resolution 0.1 °. Phase measurement requires input voltage range of 0.2 to 500V and input current range of 10 mA to 10A . Invalid phase measurements are indicated by the symbol "...", which allows the operator to avoid that the phase value " 0.0 °" when no signal is input is normally regarded as a valid measurement value.
5. Simulate the phase sequence table to indicate the phase sequence. The Chinese character indicates the positive and negative of the currently tested system and phase sequence.
6. The system vector diagram can be displayed directly or statically.
7. Optional ML250 clamp type current transformer, the current transformer may detect a change of polarity, is displayed directly I1, the ratio R (R = I1 / I2) between the reflected and I2 I1, I2 polarity relationship Phase φ I1I2 .
8. Built-in memory, can save 50 groups (screen) measurement data. The saved history data sets and vector diagrams can be accessed via the operation buttons on the panel.
9. Externally equipped with RS-232 interface, the instrument measurement data can be uploaded in groups to the PC , and the corresponding PC management software can be converted into a database to save it, or form a print report archive.
10. In the table, the rechargeable battery is installed. After a full charge, the continuous working time can be more than 15 hours when the LCD backlight is turned off , and more than 11 hours when the LCD backlight is turned on . The intelligent charging monitoring circuit does not require manual intervention and automatically monitors and changes the charging status without overcharging the battery.
11. The use of software calibration technology, simple operation, reliable data, good long-term stability. 
  
