| After-sales Service: | 1 Year |
|---|---|
| Warranty: | 1 Year |
| Display Type: | Digital Only |
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The transformer winding deformation tester has two test methods, frequency response method and low voltage short-circuit impedance method, and uses two different methods to measure the winding of the power transformer, fully reflecting the winding characteristics of the transformer, and more accurately analyzing and diagnosing the winding deformation. Two test methods, frequency response method and impedance method, are perfectly combined, saving test time and improving work efficiency.
The transformer winding deformation tester (frequency response method) is used to test power transformers and other special purpose transformers with voltage levels of 66kV and above, which are inevitably subjected to various fault short-circuit current shocks or physical impacts during operation or transportation. Under the strong electric force generated by the short-circuit current, the transformer winding may lose stability, resulting in local distortion, bulge or displacement and other permanent deformation phenomena, which will seriously affect the safe operation of the transformer. The instrument according to the national power industry standard DL/T911-2016, the international electrical standard IEC60076-18 using frequency response analysis method to measure the transformer winding deformation, is by detecting the transformer each winding amplitude frequency response characteristics, and the detection results are compared vertically or horizontally, according to the amplitude frequency response characteristics change degree, Determine the possible deformation of the transformer winding.
Transformer winding deformation tester (low voltage impedance method) is an intelligent instrument specially used to measure the impedance characteristics of large and medium-sized transformers. Article 15.2 of Document [2000] 589 issued by the State Power Company "Twenty-five Key Requirements for Preventing Major Accidents in Power Production" stipulates: "Low voltage short-circuit impedance test or winding deformation test by frequency response method should be done for transformers with voltage grades of 110KV and above before leaving the factory and putting into operation to retain original records." 15.6 stipulates: "After the transformer suffers a sudden short circuit in the near area, it should be tested by low voltage short circuit impedance or by frequency response method to test the winding deformation, and compared with the original record to determine that the transformer is no fault before it can be put into operation." The impedance measurement of low voltage short circuit can accurately reflect the impedance change of transformer before and after winding deformation. The measuring instrument adopts high precision synchronous AC sampling of voltage and current and digital signal processing technology such as FFT, and the measuring data is accurate and stable. The instrument adopts three-phase automatic measurement or single-phase measurement, the low-voltage side is reliably short-circuited, input transformer parameters, the instrument can automatically test, automatically calculate each phase impedance and impedance error percentage. The voltage and current waveform is displayed during the test, which is more suitable for field use.
The system consists of measurement part and analysis software part, the analysis part is completed by the laptop, the measurement part is connected to the laptop through the USB cable.
1,The frequency response method adopts the sweeping frequency method to measure the characteristics of the transformer winding. Without the transformer hood and disassembly, the amplitude-frequency response characteristics of each winding can be detected to accurately measure the distortion, bulge or displacement of the winding for the transformer of 66kV and above.
2,The frequency response method is fast, and the measurement time for a single winding is 1-2 minutes.
3,Frequency response method frequency accuracy is very high, frequency accuracy is 0.005%.
4,The instrument adopts 5000V voltage isolation to fully protect the safety of the test computer.
5,The instrument has the function of oscilloscope, which is convenient to monitor the test situation in real time.
6,The frequency response method can load 9 curves at the same time, the relevant parameters of each curve can be calculated automatically, and the deformation of the winding can be diagnosed automatically, and the reference conclusion of diagnosis can be given.
7,The analysis software used in frequency response method is powerful, and the software and hardware indexes meet the power industry standard DL/T911-2016 and the international electrical standard IEC60076-18.
8,The short-circuit impedance method can automatically apply voltage to the AB, BC and CA high-voltage windings of the transformer without an external voltage regulator, collect data simultaneously, and calculate the percentage of impedance error automatically. The test results are very intuitive.
9,The short-circuit impedance method is suitable for impedance measurement of transformers of any size and capacity.
10,The waveform map of test current and test voltage is displayed in the test process of short-circuit impedance method, which is convenient for real-time monitoring of the test situation.
11,The instrument has the function of measuring inductance.
12,Use the Windows platform, compatible with Windows 2000 / XP/Windows 7 / Windows/Windows 10 and Windows11.
13,Using database to save test data, the management of test data is simple and convenient.
14,The software management function is powerful, and the needs of field use are fully considered. The measurement data is automatically saved, automatically exported and generated Word version test report (need to install the corresponding Office software) or JPG image report, which is convenient for users to produce test reports.
15,The software is highly intelligent, and after the input and output signals are connected, all the measurement work can be completed by pressing a key..
16,The software interface is simple and intuitive. Analysis, storage, report export, printing and other menus, only after the completion of the current step to automatically pop up the next required menu, more convenient.
| Measuring speed | Single-phase winding 1 min -2 min |
| Output voltage | Vpp-20v, automatically adjusted during testing |
| Output impedance | 50Ω |
| Input impedance | 1MΩ (response channel built-in 50Ω matching resistance) |
| Sweep range | 100 hz - 2 MHZ |
| Frequency accuracy | 0.005% |
| Sampling frequency | 100MSPS |
| Sweep mode | Linear or logarithmic, sweep frequency and points can be set arbitrarily |
| Curve display | Amplitude-frequency curve |
| Wide measurement dynamic range | -120dB to 20dB |
| Impedance method to measure voltage | 0 ~ 220V |
| Impedance method measures current | 0 to 10A |
| Impedance frequency | 50Hz/60Hz |
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