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、仪器概述
LYBR-V变压器绕组变形测试仪根据对变压器内部绕组特征参数的测量，采用目前世界发达国家正在开发完善的内部故障频率响应分析(FRA)方法，能对变压器内部故障作出准确判断。
变压器设计制造完成后，其线圈和内部结构就确定下来，因此对一台多绕组的变压器线圈而言，如果电压等级相同、绕制方法相同，则每个线圈对应参数(Ci、Li)就应该是确定的。因此每个线圈的频域特征响应也随之确定，对应的三相线圈之间其频率图谱具有一定可比性。
变压器在试验过程中发生匝间、相间短路，或在运输过程中发生冲撞，造成线圈相对位移，以及运行过程中在短路和故障状态下因电磁拉力造成线圈变形，就会使变压器绕组的分布参数发生变化。进而影响并改变变压器原有的频域特征，即频率响应发生幅度变化和谐振频点偏移等。并根据响应分析方法研制开发的变压器绕组测试仪，就是这样一种新颖的变压器内部故障无损检测设备。它适用于63kV～500kV电力变压器的内部结构故障检测。
变压器绕组变形测试仪是将变压器内部绕组参数在不同频域的响应变化经量化处理后，根据其变化量值的大小、频响变化的幅度、区域和频响变化的趋势，来确定变压器内部绕组的变化程度，进而可以根据测量结果判断变压器是否已经受到严重破坏、是否需要进行大修。
对于运行中的变压器而言，无论过去是否保存有频域特征图，通过比较故障变压器线圈间特征图谱的差异，也可以对故障程度进行判断。当然，如果保存有一套变压器原有的绕组特征图，更易对变压器的运行状况、事故后分析和维护检修提供更为精准有力的依据。
变压器绕组变形测试仪由笔记本电脑及单片机构成高精度测量系统,结构紧，操作简单，具有较完备的测试分析功能，对照使用说明书或经过短期培训即可自行操作使用。
二、 主要技术特点
1、采集控制采用高速、高集成化微处理器。
2、笔记本电脑与仪器之间通信USB接口。
3、笔记本电脑与仪器之间通信无线蓝牙接口（选配件）。
4、硬件机芯采用DDS专用数字高速扫频技术(美国)，通过测试可以准确诊断出绕组发生扭曲、鼓包、移位、倾斜、匝间短路变形及相间接触短路等故障。
5、高速双通道16位A/D采样(现场试验改变分接开关，波形曲线有明变化)。
6、信号输出幅度软件调节，大幅度峰值±10V。
7、计算机将检测结果自动分析和生成电子文档(Word)
8、仪器具有线性扫频测量和分段扫频测量双测量系统功能,兼容当前国内两种技术流派的测量模式
9、幅频特性符合国家关于幅频特性测试仪的技术指标。横坐标（频率）具有线性分度及对数分度两种，因此打印出的曲线可以是线性分度曲线也可以是对数分度曲线，用户可根据实际需要选用。
10、检测数据自动分析系统,
横向比较A、B 、C三相之间进行绕组相似性比较,
其分析结果为:
①一致性很好
②一致性较好
③一致性较差
④一致性很差,
纵向比较A-A、B-B、C-C调取原数据与当前数据同相之间进行绕组变形比较，
其分析结果为:
①正常绕组
②轻度变形
③中度变形
④严重变形
11、可自动生成Word电子文档，供保存和打印。
12、该仪器满足电力标准DL/T911－2004《电力变压器绕组变形的频率响应分析法》的技术条件。
三、 主要技术参数
3.1 扫描方式：
1．线性扫描分布
扫频测量范围：(10Hz)-(10MHz)、40000扫频点、分辨率为0.25kHz、0.5kHz和1kHz
2．分段扫频测量分布
扫频测量范围： (0.5kHz)-(1MHz)、2000扫频点；
(0.5kHz)-(10kHz)
(10kHz)-(100kHz)
(100kHz)-(500kHz)
(500kHz)-(1000kHz)
3.2 其他技术参数：
1、幅度测量范围: (-120dB)至(+20dB)
2、幅度测量精度: 0.1dB
3、扫描频率精度: 0.01%
4、信号输入阻抗： 1MΩ
5、信号输出阻抗： 50Ω
6、扫频电压输出: ±10V (P-P=20V)
7、同相测试重复率：99.9%
8、测量仪器尺寸(长宽高)300X340X120(mm)
9、仪器铝合金箱尺寸(长宽高)310X400X330(mm)
10、总体重量:10Kg
四、 使用特点
4.1 变压器绕组变形测试仪由测量部分及分析软件部分组成，测量部分是高速单片机控制，由信号生成及信号测量组成。测量部分由无线蓝牙接口与平板电脑连接，无需接线，使用方便，也可使用USB接口与平板电脑或者笔记本电脑连接。
4.2 在测试过程中仅需要拆除变压器的连接母线，不需要对变压器进行吊罩、拆装的情况下就完成所有测试。
仪器具备多种频率线形扫频测量系统测量功能，线形扫频测量扫描频率高达2MHz，频率扫描间隔可分为0.25kHz、0.5kHz和1kHz,对变压器变形情况提供更多的分析。
仪器智能化程度高，使用方便，具有自动量程调节，自动采样频率调节等多种功能。
软件采用windows平台，兼容windows98/2000/winXP/Windows7系统。为使用者提供了更加方便和易于使用的显示界面。
提供历史曲线对比分析，可同时加载多条历史曲线观察，能具体选择任意曲线进行横向和纵向分析。配有专家智能分析诊断系统，可以自动诊断变压器绕组的状态，同时加载6条曲线，各条曲线相关参数自动计算，自动诊断绕组的变形情况，给出诊断的参考结论。
软件管理功能强，充分考虑现场使用的需要，自动保存环境条件参数，以便作变压器绕组变形诊断时提供依据。测量数据自动存盘、具有彩色打印功能，方便用户出测试报告。
软件人性化特点明显，测量的各种条件多为选择项，变压器详细参数可保存用做诊断参考，并且不用在现场输入，可以以后再添加修改信息，使用起来更加方便。
4.9 软件智能化程度高，在输入、输出信号连接好之后，设置好条件参数，就可以完成所有的测量工作，并且随时能在测量中打开历史波形曲线进行比较观 察和停止测量。
4.10 每相测量所需时间小于60秒,对一台高、中、低绕组的电力变压器（容量、电压等级不限）进行绕组变形测量，总需时间不超过10分钟。
4.11 测量变压器时,接线人员可任意布放信号输入输出引线,对测量结果无影响,接线人员可停留在变压器油箱上面,不必下来,减轻劳动强度。
五、仪器使用方法
5.1仪器面板
◇仪器面板上安装有电源自锁开关, 按下时电源打开,指示灯点亮,关闭时按下松开, 指示灯熄灭；
◇上方印有仪器型号和名称；
◇下方印有仪器生产厂名；
变压器绕组变形测试仪前面板图
◇仪器背板上安装有电源插座内藏保险丝；
◇USB通信端口连接笔记本电脑和无线蓝牙天线
◇测量信号端口:K9插座外标颜色与测量电缆外标颜色一致,请对颜色连接；
变压器绕组变形测试仪后面板图
5.2变压器的几种常用检测接线方式
变压器绕组变形测试仪主要是由主测量单元和笔记本电脑构成,并行三根专用测量电缆以及测量夹子和接地线组成。
主测量单元系统与试品之间采用50W高频同轴电缆联接，扫频信号经输出端口(激励输出)，通过连接电缆将信号夹子(黄色)向被试品注入信号;由信号测量夹子(绿色)从被试品获取信号，经电缆传输到（响应输入）；由信号测量从被试品注入点获取同步参考信号，经电缆传输到输入（参考输入）。被试品外壳与测试电缆的屏蔽层必须可靠连接并接地，大型变压器一般以铁芯接地套管引出线与油箱的连接点，作为公共接地点，变压器外壳点接地
六、三相Yn形测量接线
1、测量系统共一点接地，取变压器铁芯接地。
2、黄夹子定义为输入，钳在Yn的‘O’点、绿夹子定义为测量，钳在A相上。
3、地线连接网依次由绿夹子地线孔插入接地线至黄夹子地线孔，再连接一接地线到铁芯接地。
4、以上接线完成对三相Yn形的A相测量接线。
1、测量系统共一点接地，取变压器铁芯接地。
2、黄夹子定义为输入，钳在Yn的‘O’点、绿夹子定义为测量，钳在B相上。
3、地线连接网依次由绿夹子地线孔插入接地线至黄夹子地线孔，再连接一接地线到铁芯接地。
4、以上接线完成对三相Yn形的B相测量接线。
1、测量系统共一点接地，取变压器铁芯接地。
2、黄夹子定义为输入，钳在Yn的‘O’点、绿夹子定义为测量，钳在C相上。
3、地线连接网依次由绿夹子地线孔插入接地线至黄夹子地线孔，再连接一接地线到铁芯接地。
4、以上接线完成对三相Yn形的C相测量接线。
七、三相Y形测量接线
1、测量系统共一点接地，取变压器铁芯接地。
2、黄夹子定义为输入，钳在Y形的A相、绿夹子定义为测量，钳在B相上。
3、地线连接网依次由绿夹子地线孔插入接地线至黄夹子地线孔，再连接一接地线到铁芯接地。
4、以上接线完成对三相Y形的AB相测量接线。
1、测量系统共一点接地，取变压器铁芯接地。
2、黄夹子定义为输入，钳在Y形的B相、绿夹子定义为测量，钳在C相上。
3、地线连接网依次由绿夹子地线孔插入接地线至黄夹子地线孔，再连接一接地线到铁芯接地。
4、以上接线完成对三相Y形的BC相测量接线。
1、测量系统共一点接地，取变压器铁芯接地。
2、黄夹子定义为输入，钳在Y形的C相、绿夹子定义为测量，钳在A相上。
3、地线连接网依次由绿夹子地线孔插入接地线至黄夹子地线孔，再连接一地线到铁芯接地。
4、以上接线完成对三相Y形的CA相测量接线。
八、三相△形测量接线
1、测量系统共一点接地，取变压器铁芯接地。
2、黄夹子定义为输入，钳在△形的A相、绿夹子定义为测量，钳在B相上。
3、地线连接网依次由绿夹子地线孔插入接地线至黄夹子地线孔，再连接一地线到铁芯接地。
4、以上接线完成对三相△形的AB相测量接线。
1、测量系统共一点接地，取变压器铁芯接地。
2、黄夹子定义为输入，钳在△形的B相、绿夹子定义为测量，钳在C相上。
3、地线连接网依次由绿夹子地线孔插入接地线至黄夹子地线孔，再连接一地线到铁芯接地。
4、以上接线完成对三相△形的AB相测量接线。
1、测量系统共一点接地，取变压器铁芯接地。
2、黄夹子定义为输入，钳在△形的A相、绿夹子定义为测量，钳在B相上。
3、地线连接网依次由绿夹子地线孔插入接地线至黄夹子地线孔，再连接一地线到铁芯接地。
4、以上接线完成对三相△形的AB相测量接线。
九、单相X、Y、Z测量接线
1、测量系统共一点接地，取变压器铁芯接地。
2、黄夹子定义为输入，钳在单相的y点、绿夹子定义为测量，钳在b点上。
3、地线连接网依次由绿夹子地线孔插入接地线至黄夹子地线孔，再连接一地线到铁芯接地。
4、以上接线完成对单相X的测量接线。
1、测量系统共一点接地，取变压器铁芯接地。
2、黄夹子定义为输入，钳在单相的y点、绿夹子定义为测量，钳在b点上。
3、地线连接网依次由绿夹子地线孔插入接地线至黄夹子地线孔，再连接一地线到铁芯接地。
4、以上接线完成对单相Y的测量接线。
1、测量系统共一点接地，取变压器铁芯接地。
2、黄夹子定义为输入，钳在单相的z点、绿夹子定义为测量，钳在c点上。
3、地线连接网依次由绿夹子地线孔插入接地线至黄夹子地线孔，再连接一地线到铁芯接地。
4、以上接线完成对单相Z的测量接线。
注意事项:
该仪器在测量之前应预热15分钟，如果在冬季等气温偏低的情况下，预热时间应适当加长，确保仪器的正常测量。
注意严格按示意图接地线，特别注意的是响应信号的接地夹子要先通过连接线与激励信号的接地夹子连接，再由激励信号的接地线与铁芯接地，保证信号电流的正确流向。