The transformer winding deformation tester can accurately judge the internal faults of the transformer based on the measurement of the characteristic parameters of the internal windings of the transformer and the internal fault frequency response analysis (FRA) method currently being developed and perfected by developed countries in the world.

After the transformer is designed and manufactured, its coils and internal structure are determined. Therefore, for a multi-winding transformer coil, if the voltage level is the same and the winding method is the same, the corresponding parameters (Ci, Li) of each coil should be is certain. Therefore, the frequency domain characteristic response of each coil is also determined, and the frequency spectra between the corresponding three-phase coils are comparable.

If the transformer has short circuits between turns or phases during the test, or collisions during transportation, resulting in relative displacement of the coils, and coil deformation due to electromagnetic tension under short circuit and fault conditions during operation, the distribution parameters of the transformer windings will be affected. changes occur. This in turn affects and changes the original frequency domain characteristics of the transformer, that is, the frequency response changes in amplitude and the resonance frequency point shifts, etc. The transformer winding tester developed based on the response analysis method is such a novel non-destructive testing equipment for internal faults in transformers. It is suitable for internal structural fault detection of 63kV~500kV power transformers.

The transformer winding deformation tester quantifies the response changes of the transformer's internal winding parameters in different frequency domains, and then determines the internal winding of the transformer based on the magnitude of the change, the amplitude and area of the frequency response change, and the trend of the frequency response change. The degree of change can be used to determine whether the transformer has been seriously damaged and needs to be overhauled based on the measurement results.
For operating transformers, regardless of whether frequency domain characteristic maps have been saved in the past, the degree of fault can also be judged by comparing the differences in characteristic maps between coils of faulty transformers. Of course, if a set of original winding characteristic diagrams of the transformer is preserved, it will be easier to provide a more accurate and powerful basis for the transformer's operating status, post-accident analysis and maintenance.


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1. The acquisition control adopts high-speed and highly integrated microprocessor.
2. USB interface for communication between laptop and instrument.
3. The wireless Bluetooth interface or wireless WIFI interface can be used to communicate between the laptop and the instrument. The wireless WIFI interface can be easily used on tablet computers and smart phones.
4. The hardware movement adopts DDS dedicated digital high-speed sweep technology. Through testing, faults such as twisting, bulging, shifting, tilting, inter-turn short circuit deformation, and inter-phase contact short circuit can be accurately diagnosed through testing.
5. High-speed dual-channel 16-bit A/D sampling (on-site testing changes the tap changer, and the waveform curve changes significantly).
6. The signal output amplitude is adjusted by software, the maximum amplitude peak value is ±10V.
7. The computer automatically analyzes the test results and generates an electronic document (Word).
8. The instrument has dual measurement system functions of linear frequency sweep measurement and segmented frequency sweep measurement, and is compatible with the measurement modes of the two current domestic technical schools.
9. The amplitude-frequency characteristics comply with the national technical specifications for amplitude-frequency characteristic testers. The abscissa (frequency) has two types: linear graduation and logarithmic graduation. Therefore, the printed curve can be a linear graduation curve or a logarithmic graduation curve. The user can choose according to actual needs.
10. Automatic detection data analysis system
Horizontally compare the winding similarities between the three phases A, B and C.
The analysis results are:
The consistency is very good
Good consistency
Poor consistency
The consistency is very poor,
Vertical comparison A-A, B-B, C-C retrieves the original data and the current data in the same phase to compare the winding deformation.
The analysis results are:
Normal winding
Mild deformation
Moderate deformation
Severe deformation
11. Word electronic documents can be automatically generated for saving and printing.
12. This instrument fully meets the technical conditions of the power standard DL/T911-2016 "Frequency response analysis method of power transformer winding deformation".

Scanning method

1. Linear scan distribution

Sweep frequency measurement range: (10Hz)-(10MHz) 40000 sweep frequency points, resolutions are 0.25kHz, 0.5kHz and 1kHz.

2. Segmented frequency sweep measurement distribution

Sweep frequency measurement range: (0.5kHz)-(1MHz), 2000 sweep frequency points;

(0.5kHz)-(10kHz)

(10kHz)-(100kHz)

(100kHz)-(500kHz)

(500kHz)-(1000kHz)

1. The transformer winding deformation tester consists of a measurement part and an analysis software part. The measurement part is controlled by a high-speed microcontroller and consists of signal generation and signal measurement. The measurement part is connected to a tablet computer through a wireless WIFI interface, which requires no wiring and is easy to use. Wireless Bluetooth and USB interfaces can also be used to connect to a tablet or laptop computer.

2. During the test process, only the connecting busbar of the transformer needs to be removed, and all tests can be completed without hanging the cover or disassembling the transformer.

3. The instrument has a variety of frequency linear sweep measurement system measurement functions. The linear sweep measurement scanning frequency is up to 10MHz. The frequency sweep interval can be divided into 0.25kHz, 0.5kHz and 1kHz, providing more analysis of the transformer deformation.

4. The instrument is highly intelligent, easy to use, and has multiple functions such as automatic range adjustment and automatic sampling frequency adjustment.

5. The software uses the windows platform and is compatible with Win98/2000/WinXP/Win7/Win8/Win10 systems. Provides users with a more convenient and easy-to-use display interface.

6. Provides comparative analysis of historical curves, can load multiple historical curves for observation at the same time, and can specifically select any curve for horizontal and vertical analysis. Equipped with an expert intelligent analysis and diagnosis system, it can automatically diagnose the status of the transformer winding, load 6 curves at the same time, automatically calculate the relevant parameters of each curve, automatically diagnose the deformation of the winding, and provide reference conclusions for diagnosis.

7. The software management function is powerful, fully considering the needs of on-site use, and automatically saving environmental condition parameters to provide a basis for diagnosing transformer winding deformation. The measurement data is automatically saved and has a color printing function to facilitate users to produce test reports.

8. The software has obvious humanization features. Most of the measured conditions are options. The detailed parameters of the transformer can be saved for diagnostic reference, and there is no need to input them on site. Information can be added and modified later, making it more convenient to use.

9. The software is highly intelligent. After the input and output signals are connected and the condition parameters are set, all measurement work can be completed, and historical waveform curves can be opened during measurement at any time for comparison and observation and to stop measurement.

10. The measurement time of each phase is less than 60 seconds, and the total time required for winding deformation measurement of a power transformer with high, medium or low windings (no limit on capacity and voltage level) is no more than 10 minutes.

11.When measuring the transformer, the wiring personnel can place the signal input and output leads arbitrarily without affecting the measurement results. The wiring personnel can stay on the transformer tank without coming down, which reduces labor intensity.

Company profile

XZH TEST is a professional cable fault detection equipment manufacturer. We are a young team. Our development philosophy is humanized management, intelligent cloud-based products, and internationalized operations. Our development mission is to make electrical equipment free from undetectable failures.

Since its inception in 2013, our company has grown to become one of the largest manufacturer of underground cable fault detection equipment in China. An ISO 9001 and CE certified company, we produces a broad range of testing equipment.

What we can do

We have the ability to innovate new products and technologies.

We can provide complete system solutions for your project.

We provide online and offline practical and theoretical training.

We provide instrument repair and calibration.