System Introduction
The Sweep Frequency Response Analyzer is used for power transformer with voltage grade of 66kV and above and other transformers with special purpose. The power transformer is inevitably vulnerable to impulse of various fault short-circuit current or physical collision in the process of operation and transportation and the transformer windings may lose stability under the powerful electro-dynamic force exerted by such short-circuit current, which could result in permanent deformations such as local distortion, swell or dislocation and will severely affect safe operation of the transformer. Deformation of transformer windings is measured with frequency response analysis method according to national standard DL/T911-2016/IEC60076-18 for electric power industry, i.e. detect amplitude-frequency response characteristic of each transformer winding and make vertical or horizontal comparison of the detection result to judge possible deformation of the transformer winding based on change of amplitude-frequency response characteristics.
1、Main Technical Characteristics（LYBRZ-II Transformer winding deformation tester）
Characteristics of transformer windings are measured with frequency sweep method. Deformations of windings such as distortion, swell or displacement of 66kV and above transformer are measured by detecting amplitude-frequency response characteristics of each winding, not requiring lifting of transformer enclosure or disintegration.
Quick measuring, measuring of a single winding is within 2 minutes.
High frequency accuracy, higher than 0.001%.
Digital frequency synthesis, with higher frequency stability.
5000V voltage isolation fully protects safety of the testing computer.
Able to load 9 curves at the same time and automatically calculate parameters of each curve and diagnose winding deformations to provide the reference diagnosis conclusion.
Analysis software has powerful functions and software and hardware indicators satisfy national standard DL/T911-2016/IEC60076-18.
Software management is humanized with high degree of intelligence. You only need to click one key to complete all measurements after setting of parameters.
The software interface is concise and vivid, with clear menus of analysis, save, report export, print, etc.
2、Main Technical Indicators（LYBRZ-II Transformer winding deformation tester）
Measuring speed: 1 min- 2 min for single-phase winding
Output voltage: Vpp-25V, adjusting automatically in test
Output impedance: 50Ω
Input impedance: 1MΩ (the response channel is built with 50Ω matching resistance)
Frequency sweep scope: 10Hz-2MHz
Frequency accuracy: 0.001%
Frequency sweep manner: linear or logarithmic, frequency sweep interval and number of sweep points are freely settable
Curve display: amplitude-frequency curve
Width of measuring dynamic range: -100dB~20dB
Supply voltage: AC100-240V 50/60Hz (use DC12V Adapater recommend)
DIM: 238mm*184mm*40mm
Net weight: 2.45kg
3、Main Features of Test Analysis Software（LYBRZ-II Transformer winding deformation tester）
Use windows platform compatible with Windows 2000/Windows XP/Windows 7/windows 8/Windows10/Windows11.
Use database to save test data and render concise and easy data management.
Able to load 9 curves at the same time and automatically calculate parameters of each curve and diagnose winding deformations to provide the reference diagnosis conclusion.
Software management function is powerful that takes into full account of site use demand. Measuring data is automatically saved and exported to form Word version test report (require installation of relevant Office software) or JPG photo report to facilitate the user to export test report.
The software has distinctive humanized feature. Measuring conditions are mostly options, which exempt the need of many inputs and bring about easier operation.
The software has high degree of intelligence. You only need to click one key to complete all measurements after connection of input and output signals.
The software interface is concise, vivid and practical.
Part I Operation Flow of System（LYBRZ-II Transformer winding deformation tester）
Ground collector
Connect collector and transformer winding
Connect collector and computer
Start up computer
Power on collector
Log in software
Input information
Select end-frequency and adjust testing parameter
Select winding
Start testing
Replace test winding
Select winding
Start test
Repeat above process until all winding tests are done
Analyze data
Export report
Turn off software
Power off collector
Disconnect collector and computer
Remove transformer winding
Test completed.
Part II Preparation
Note: basic operations of computer and Windows operating system are not contained in the operation instructions. Please refer to relevant computer books.
Note: basic operations of Windows operating system involved in the operation instructions are based on Windows 7 operating system. The differences in operation between other Windows system and Windows 7 system are not contained in the operation instructions, for which please refer to relevant computer books.
Part III Test Wiring
3.1 Panel Introduction
Panel of the transformer winding deformation tester is as shown in Figure 1.
External wiring illustration during Sweep Frequency Response Analyzer is as shown in Figure 2. Frequency sweep voltage signal is input from excitation end of the tester to initial end of the tested transformer winding through input resistance (internal resistance), voltage signal at the initial end to input end of the tester and voltage signal at the tail end of the tested transformer winding to response end of the tester. “Ground” of the Sweep Frequency Response Analyzer as well as enclosure and core of the “tested transformer” are grounded together.
3.2 Winding Wiring Mode
It is recommended to input frequency sweep signal of winding deformation frequency response test from tail end of winding and output from initial end, suspended for non-tested winding. Wiring mode of winding deformation test varies with different wiring group of the transformer.
YN Wiring
Input impedance of frequency sweep signal is connected to neutral point O and output impedance to A, B and C respectively. For the measuring method, interference signal received by non-measured phase is absorbed by low impedance of the signal generator, as shown in Figure 3.
Y Wiring
It is required to wire in the following manner as neutral point has no outgoing wire, as shown in Figure 4.
In this test, input impedance is connected to A and output impedance to B.
In this test, input impedance is connected to B and output impedance to C.
In this test, input impedance is connected to C and output impedance to A.
Interior Connection △ Wiring
Wiring mode of interior connection △ wired winding is as shown in Figure 5.
In this test, input impedance is connected to c and output impedance to a，on behalf of a phase.
In this test, input impedance is connected to a and output impedance to b，on behalf of b phase.
In this test, input impedance is connected to b and output impedance to c，on behalf of c phase.
Theoretically, the two non-measured windings that are connected in series first and then connected with the circuit in parallel in interior connection Δ wiring mode have some effect over the testing process. However, it is believed that their effect over the non-measured coil is negligible when attenuation is more than 10dB.
Exterior connection Δ wiring
Wiring mode when windings are disengaged in measurement is as shown in Figure 6. It is regarded interior connection Δ wiring if connections are not disengaged, when the wiring mode is as shown in Figure 7.
In this test, input impedance is connected to x and output impedance to a，on behalf of a phase.
In this test, input impedance is connected to y and output impedance to b，on behalf of b phase.
In this test, input impedance is connected to z and output impedance to c，on behalf of c phase.
Transformer with Balance Winding
The transformer with balance winding must be ungrounded in test, as shown in Figure 7.
Part IV System Test
4.1 Start of “SFRA test” Program
1）Double click the icon
of “SFRA test” to start the program of “transformer winding deformation test system”.
2）Enter the main program interface titled “Sweep Frequency Response Analyzer” after the start process (double click the small icon
at the top left corner of the screen to switch to the desktop. Please do not click the icon in the process of test.)
The software main interface consists of 7 parts:
（A）Test Curve Display Area
The area displays test curve with frequency as X-coordinate and dB value with Y-coordinate (amplitude-frequency test) or angle value (phase-frequency test). The label below consists of:
Curve type label: to mark the current display is “amplitude-frequency curve” or “phase-frequency curve”. Click the label to switch between the two types (require hardware support).
Sweep mode label: to display the current sweeping mode is linear sweeping or logarithmic sweeping. Click the label to switch between the two modes.
Start frequency label: to display start frequency of current sweeping. Click the label to switch among different start frequencies.
Stop frequency label: to display stop frequency of current sweeping.
Sweeping point number label: to display total point number of current sweeping. Click the label to switch among different point numbers.
（B）Status Display Area
The status display area displays working status of the current equipment.
（C）Operating Zone
There are two keys in the operating area, start
and stop
that display in turn according to service status, i.e. “start” displays under stop status and “stop” under start status.
（D）Test Parameter Setting Area
Area D displays parameter setting window that is used for setting of test parameters, including winding wiring method, category , Tap position and number of the winding to be tested, sweep stop frequency, etc.
（E）Curve Description Area
Area E displays description information of the current curve. The label in a color contains description information of its corresponding curve in the same color.
（F）Data Selection Area
What locates at the top right corner (F) is data selection area. Test data applies hierarchical management, where the first grade is name of substation, the second grade name of transformer, the third grade category and number of transformer winding and the last grade existing data. Data name is displayed in the manner of “data type @ test time”. Data displayed in the part matches with content of the label in area (A). When “amplitude-frequency curve” is displayed, the data selection area displays test result of the amplitude-frequency curve and when “phase-frequency curve” is displayed, the data selection area displays test result of the phase-frequency curve.
When “amplitude-frequency curve” or “phase-frequency curve” is displayed, the test result is displayed in area A when relevant data is clicked.
（G）Function Key Area
Keys in the function key area (G) will switch automatically and display dynamically based on the use function.
4.2 Frequency Response Method Test
Environment and Wiring Confirmation
The system is wired according to requirements of 3.2 winding wiring mode.
Tap position of the transformer is adjusted to the maximum impedance position (the first tap)
The surrounding environment is free from strong electromagnetic interference.
Software Log-in
Double click the icon
of “Sweep Frequency Response Analyzer” on the desktop. The system will flash through the welcome interface and then enter the test interface. The system will have following dialogue box if equipment is not connected:
Occurrence of the above dialogue box is generally caused by connection failure of equipment. In this case, first check whether equipment is connected to USB interface of the computer and then check whether equipment power supply is switched on.
Information Input
Transformer information log-in interface (as shown in the figure below) is entered when equipment is connected, where you may input or select information in relevant textbox and click save key so that the system will enter the test interface.
Please input carefully according to the transformer nameplate while inputting information as all information is automatically saved together with the test result and incorrect input may affect the contents of the report.
Sweeping Mode Confirmation and Modification
1、 Selection of Sweeping Mode
Click “Stop Frequency”
to select test stop frequency and then the system will automatically set parameters to the set parameters according to the set sweeping parameters, including start frequency, sweeping mode, and sweeping point number. To adjust, click the parameter label in area A to switch automatically (the label automatically turns green when the mouse pointer moves to a changeable label).
2、Change of Default Information
To readjust the default setting information, click “Stop Frequency”
key with right mouse button to let the function menu pop up. The information setting window (as shown in the figure below) will pop up when “setting” is selected, where you may adjust the default sweeping information and restart the software after adjustment. Then the system will test with the adjusted default information.
The above adjustment is used for setting of default information that is distinguished by the value of “stop frequency”. Actually, adjustment is generally performed as required during the first time use in practical application and is not performed later unless there is regulation or special requirement.
3、Change of Sweeping Parameters
Change of sweeping parameters is used for testing of complicated parameter combinations. The system doesn’t have memory function and will recover automatically once quit.
Click parameter label in the curve display area (A) before sweeping to change information other than stop frequency in the manner of cyclic adjustment.
Change of sweeping parameters is applicable to single test with measuring result requirement or for the sake of research, generally not requiring adjustment.
Test
You may start data measurement with frequency response method after setting of basic test information. The system will automatically complete frequency sweep after “START” key is clicked. The
key will turn to
key in the process of test that could stop the current sweeping once clicked. The test pauses once the signal curve display area is clicked and proceeds when clicked again.
After completion of a test item, change the wiring mode, change software setting information, click again
key, measure the next item and repeat the above operations until all measurement items are completed.
The test waveform display area is unfolded when the test curve display area (A) is double clicked in the test process, which contains waveform display, input voltage peak value (red), response voltage peak value (yellow), amplification factor and X-coordinate time information used for signal research.
4.3 Correlation Analysis
Curves in area E are automatically divided into three groups, 1-3 as a group, 4-6 as a group and 7-9 as a group and correlation analysis of each group of curves is performed inside the respective group. Once 
is clicked, report display window will pop up at the left side that displays contents of the current test report. The operator may reconfirm and re-input information and click 
on the report display window to let the save dialogue box pop up, where the operator may set file name, file type and save path. The result is saved in “FRA_data” of disk D by default with file name of “print report” + “print time”.
4.4 Data Echo
The system is able to echo saved data. By selecting name of power station, name of transformer, test category and time, as well as winding type and time in turn in area F, the completed test result is called out. By default, the data is displayed at the position of the first curve and displayed downwards with progressive increase of the selection result. When the number of curves comes to the maximum (9 curves), the curve no longer increases and you may select the curve to be replaced for progressive replacement in this case. When a curve is decided not requiring analysis, you may right click “clear curve” on the curve description information (E) so that the curve will be removed out of the analysis list automatically.
Curves in area E are automatically divided into three groups, 1-3 as a group, 4-6 as a group and 7-9 as a group and correlation analysis of each group of curves is performed inside the respective group. Therefore, it is required to ensure the curves to be analyzed are within the same group, or otherwise you cannot get correct analysis result.
When “analysis”
is clicked after selection of curve, the report display window will pop up at the left side. All other operations are the same as operations described in 4.3.
4.5 Report Saving Position
Report is saved under folder of disk D with the folder hierarchy of:
D: \FRA_data\test report+ print time. doc or test report+ print time. jpg.
The report could be WORD document or JPG photo, subject to the option selected in saving.
Part V Tester Maintenance
The section provides basic maintenance data. Please do not try to disintegrate, modify and repair the Sweep Frequency Response Analyzer.
5.1 Basic Maintenance
Regularly scrub surfaces of the tester and its accessories with a clean cloth.
Put the tester at a clean place with low humidity and protect it against entry of dirt and dust. Put the tester into its packing case when not used and keep the packing case level.
5.2 Senior Maintenance
To be proceeded by professional technicians of the Company.
Part VI Ordering and Service
6.1 Damages of the tester as a result of product quality issue within 18 months since its delivery will be repaired free of charge; for damages due to other reasons, the Company only charges repair cost.
6.2 We provide lifetime maintenance and technical services for the products.
6.3 Please contact us immediately upon discovery of any abnormality in the tester. We will provide the most convenient solution for you. DO NOT disassemble the tester!
一、儀器概述
LYBR-V變壓器繞組變形測試儀根據對變壓器內部繞組特征參數的測量，采用目前世界發達國家正在開發完善的內部故障頻率響應分析(FRA)方法，能對變壓器內部故障作出準確判斷。
變壓器設計制造完成后，其線圈和內部結構就確定下來，因此對一臺多繞組的變壓器線圈而言，如果電壓等級相同、繞制方法相同，則每個線圈對應參數(Ci、Li)就應該是確定的。因此每個線圈的頻域特征響應也隨之確定，對應的三相線圈之間其頻率圖譜具有一定可比性。
變壓器在試驗過程中發生匝間、相間短路，或在運輸過程中發生沖撞，造成線圈相對位移，以及運行過程中在短路和故障狀態下因電磁拉力造成線圈變形，就會使變壓器繞組的分布參數發生變化。進而影響并改變變壓器原有的頻域特征，即頻率響應發生幅度變化和諧振頻點偏移等。并根據響應分析方法研制開發的變壓器繞組測試儀，就是這樣一種新穎的變壓器內部故障無損檢測設備。它適用于63kV～500kV電力變壓器的內部結構故障檢測。
變壓器繞組變形測試儀是將變壓器內部繞組參數在不同頻域的響應變化經量化處理后，根據其變化量值的大小、頻響變化的幅度、區域和頻響變化的趨勢，來確定變壓器內部繞組的變化程度，進而可以根據測量結果判斷變壓器是否已經受到嚴重破壞、是否需要進行大修。
對于運行中的變壓器而言，無論過去是否保存有頻域特征圖，通過比較故障變壓器線圈間特征圖譜的差異，也可以對故障程度進行判斷。當然，如果保存有一套變壓器原有的繞組特征圖，更易對變壓器的運行狀況、事故后分析和維護檢修提供更為精準有力的依據。
變壓器繞組變形測試儀由筆記本電腦及單片機構成高精度測量系統,結構緊，操作簡單，具有較完備的測試分析功能，對照使用說明書或經過短期培訓即可自行操作使用。
二、 主要技術特點
1、采集控制采用高速、高集成化微處理器。
2、筆記本電腦與儀器之間通信USB接口。
3、筆記本電腦與儀器之間通信無線藍牙接口（選配件）。
4、硬件機芯采用DDS專用數字高速掃頻技術(美國)，通過測試可以準確診斷出繞組發生扭曲、鼓包、移位、傾斜、匝間短路變形及相間接觸短路等故障。
5、高速雙通道16位A/D采樣(現場試驗改變分接開關，波形曲線有明變化)。
6、信號輸出幅度軟件調節，大幅度峰值±10V。
7、計算機將檢測結果自動分析和生成電子文檔(Word)
8、儀器具有線性掃頻測量和分段掃頻測量雙測量系統功能,兼容當前國內兩種技術流派的測量模式
9、幅頻特性符合國家關于幅頻特性測試儀的技術指標。橫坐標（頻率）具有線性分度及對數分度兩種，因此打印出的曲線可以是線性分度曲線也可以是對數分度曲線，用戶可根據實際需要選用。
10、檢測數據自動分析系統,
橫向比較A、B 、C三相之間進行繞組相似性比較,
其分析結果為:
①一致性很好
②一致性較好
③一致性較差
④一致性很差,
縱向比較A-A、B-B、C-C調取原數據與當前數據同相之間進行繞組變形比較，
其分析結果為:
①正常繞組
②輕度變形
③中度變形
④嚴重變形
11、可自動生成Word電子文檔，供保存和打印。
12、該儀器滿足電力標準DL/T911－2004《電力變壓器繞組變形的頻率響應分析法》的技術條件。
三、 主要技術參數
3.1 掃描方式：
1．線性掃描分布
掃頻測量范圍：(10Hz)-(10MHz)、40000掃頻點、分辨率為0.25kHz、0.5kHz和1kHz
2．分段掃頻測量分布
掃頻測量范圍： (0.5kHz)-(1MHz)、2000掃頻點；
(0.5kHz)-(10kHz)
(10kHz)-(100kHz)
(100kHz)-(500kHz)
(500kHz)-(1000kHz)
3.2 其他技術參數：
1、幅度測量范圍: (-120dB)至(+20dB)
2、幅度測量精度: 0.1dB
3、掃描頻率精度: 0.01%
4、信號輸入阻抗： 1MΩ
5、信號輸出阻抗： 50Ω
6、掃頻電壓輸出: ±10V (P-P=20V)
7、同相測試重復率：99.9%
8、測量儀器尺寸(長寬高)300X340X120(mm)
9、儀器鋁合金箱尺寸(長寬高)310X400X330(mm)
10、總體重量:10Kg
四、 使用特點
4.1 變壓器繞組變形測試儀由測量部分及分析軟件部分組成，測量部分是高速單片機控制，由信號生成及信號測量組成。測量部分由無線藍牙接口與平板電腦連接，無需接線，使用方便，也可使用USB接口與平板電腦或者筆記本電腦連接。
4.2 在測試過程中僅需要拆除變壓器的連接母線，不需要對變壓器進行吊罩、拆裝的情況下就完成所有測試。
儀器具備多種頻率線形掃頻測量系統測量功能，線形掃頻測量掃描頻率高達2MHz，頻率掃描間隔可分為0.25kHz、0.5kHz和1kHz,對變壓器變形情況提供更多的分析。
儀器智能化程度高，使用方便，具有自動量程調節，自動采樣頻率調節等多種功能。
軟件采用windows平臺，兼容windows98/2000/winXP/Windows7系統。為使用者提供了更加方便和易于使用的顯示界面。
提供歷史曲線對比分析，可同時加載多條歷史曲線觀察，能具體選擇任意曲線進行橫向和縱向分析。配有專家智能分析診斷系統，可以自動診斷變壓器繞組的狀態，同時加載6條曲線，各條曲線相關參數自動計算，自動診斷繞組的變形情況，給出診斷的參考結論。
軟件管理功能強，充分考慮現場使用的需要，自動保存環境條件參數，以便作變壓器繞組變形診斷時提供依據。測量數據自動存盤、具有彩色打印功能，方便用戶出測試報告。
軟件人性化特點明顯，測量的各種條件多為選擇項，變壓器詳細參數可保存用做診斷參考，并且不用在現場輸入，可以以后再添加修改信息，使用起來更加方便。
4.9 軟件智能化程度高，在輸入、輸出信號連接好之后，設置好條件參數，就可以完成所有的測量工作，并且隨時能在測量中打開歷史波形曲線進行比較觀 察和停止測量。
4.10 每相測量所需時間小于60秒,對一臺高、中、低繞組的電力變壓器（容量、電壓等級不限）進行繞組變形測量，總需時間不超過10分鐘。
4.11 測量變壓器時,接線人員可任意布放信號輸入輸出引線,對測量結果無影響,接線人員可停留在變壓器油箱上面,不必下來,減輕勞動強度。
五、儀器使用方法
5.1儀器面板
◇儀器面板上安裝有電源自鎖開關, 按下時電源打開,指示燈點亮,關閉時按下松開, 指示燈熄滅；
◇上方印有儀器型號和名稱；
◇下方印有儀器生產廠名；
變壓器繞組變形測試儀前面板圖
◇儀器背板上安裝有電源插座內藏保險絲；
◇USB通信端口連接筆記本電腦和無線藍牙天線
◇測量信號端口:K9插座外標顏色與測量電纜外標顏色一致,請對顏色連接；
變壓器繞組變形測試儀后面板圖
5.2變壓器的幾種常用檢測接線方式
變壓器繞組變形測試儀主要是由主測量單元和筆記本電腦構成,并行三根專用測量電纜以及測量夾子和接地線組成。
主測量單元系統與試品之間采用50W高頻同軸電纜聯接，掃頻信號經輸出端口(激勵輸出)，通過連接電纜將信號夾子(黃色)向被試品注入信號;由信號測量夾子(綠色)從被試品獲取信號，經電纜傳輸到（響應輸入）；由信號測量從被試品注入點獲取同步參考信號，經電纜傳輸到輸入（參考輸入）。被試品外殼與測試電纜的屏蔽層必須可靠連接并接地，大型變壓器一般以鐵芯接地套管引出線與油箱的連接點，作為公共接地點，變壓器外殼點接地
六、三相Yn形測量接線
1、測量系統共一點接地，取變壓器鐵芯接地。
2、黃夾子定義為輸入，鉗在Yn的‘O’點、綠夾子定義為測量，鉗在A相上。
3、地線連接網依次由綠夾子地線孔插入接地線至黃夾子地線孔，再連接一接地線到鐵芯接地。
4、以上接線完成對三相Yn形的A相測量接線。
1、測量系統共一點接地，取變壓器鐵芯接地。
2、黃夾子定義為輸入，鉗在Yn的‘O’點、綠夾子定義為測量，鉗在B相上。
3、地線連接網依次由綠夾子地線孔插入接地線至黃夾子地線孔，再連接一接地線到鐵芯接地。
4、以上接線完成對三相Yn形的B相測量接線。
1、測量系統共一點接地，取變壓器鐵芯接地。
2、黃夾子定義為輸入，鉗在Yn的‘O’點、綠夾子定義為測量，鉗在C相上。
3、地線連接網依次由綠夾子地線孔插入接地線至黃夾子地線孔，再連接一接地線到鐵芯接地。
4、以上接線完成對三相Yn形的C相測量接線。
七、三相Y形測量接線
1、測量系統共一點接地，取變壓器鐵芯接地。
2、黃夾子定義為輸入，鉗在Y形的A相、綠夾子定義為測量，鉗在B相上。
3、地線連接網依次由綠夾子地線孔插入接地線至黃夾子地線孔，再連接一接地線到鐵芯接地。
4、以上接線完成對三相Y形的AB相測量接線。
1、測量系統共一點接地，取變壓器鐵芯接地。
2、黃夾子定義為輸入，鉗在Y形的B相、綠夾子定義為測量，鉗在C相上。
3、地線連接網依次由綠夾子地線孔插入接地線至黃夾子地線孔，再連接一接地線到鐵芯接地。
4、以上接線完成對三相Y形的BC相測量接線。
1、測量系統共一點接地，取變壓器鐵芯接地。
2、黃夾子定義為輸入，鉗在Y形的C相、綠夾子定義為測量，鉗在A相上。
3、地線連接網依次由綠夾子地線孔插入接地線至黃夾子地線孔，再連接一地線到鐵芯接地。
4、以上接線完成對三相Y形的CA相測量接線。
八、三相△形測量接線
1、測量系統共一點接地，取變壓器鐵芯接地。
2、黃夾子定義為輸入，鉗在△形的A相、綠夾子定義為測量，鉗在B相上。
3、地線連接網依次由綠夾子地線孔插入接地線至黃夾子地線孔，再連接一地線到鐵芯接地。
4、以上接線完成對三相△形的AB相測量接線。
1、測量系統共一點接地，取變壓器鐵芯接地。
2、黃夾子定義為輸入，鉗在△形的B相、綠夾子定義為測量，鉗在C相上。
3、地線連接網依次由綠夾子地線孔插入接地線至黃夾子地線孔，再連接一地線到鐵芯接地。
4、以上接線完成對三相△形的AB相測量接線。
1、測量系統共一點接地，取變壓器鐵芯接地。
2、黃夾子定義為輸入，鉗在△形的A相、綠夾子定義為測量，鉗在B相上。
3、地線連接網依次由綠夾子地線孔插入接地線至黃夾子地線孔，再連接一地線到鐵芯接地。
4、以上接線完成對三相△形的AB相測量接線。
九、單相X、Y、Z測量接線
1、測量系統共一點接地，取變壓器鐵芯接地。
2、黃夾子定義為輸入，鉗在單相的y點、綠夾子定義為測量，鉗在b點上。
3、地線連接網依次由綠夾子地線孔插入接地線至黃夾子地線孔，再連接一地線到鐵芯接地。
4、以上接線完成對單相X的測量接線。
1、測量系統共一點接地，取變壓器鐵芯接地。
2、黃夾子定義為輸入，鉗在單相的y點、綠夾子定義為測量，鉗在b點上。
3、地線連接網依次由綠夾子地線孔插入接地線至黃夾子地線孔，再連接一地線到鐵芯接地。
4、以上接線完成對單相Y的測量接線。
1、測量系統共一點接地，取變壓器鐵芯接地。
2、黃夾子定義為輸入，鉗在單相的z點、綠夾子定義為測量，鉗在c點上。
3、地線連接網依次由綠夾子地線孔插入接地線至黃夾子地線孔，再連接一地線到鐵芯接地。
4、以上接線完成對單相Z的測量接線。
注意事項:
該儀器在測量之前應預熱15分鐘，如果在冬季等氣溫偏低的情況下，預熱時間應適當加長，確保儀器的正常測量。
注意嚴格按示意圖接地線，特別注意的是響應信號的接地夾子要先通過連接線與激勵信號的接地夾子連接，再由激勵信號的接地線與鐵芯接地，保證信號電流的正確流向。
