Transformer Winding Deformation TesterSystemIntroduction
The Transformer Winding Deformation Tester is used to test the winding deformation of power transformers with voltage levels of 6kV and above, as well as other special-purpose transformers. During operation or transportation, power transformers inevitably suffer from various fault short-circuit current impacts or physical collisions. Under the strong electrodynamic force generated by short-circuit currents, transformer windings may lose stability, leading to permanent deformation phenomena such as local distortion, bulging, or displacement, which will seriously affect the safe operation of the transformer. This instrument adopts the frequency response analysis method according to the national electric power industry standard DL/T911-2016 and the international electrotechnical standard IEC60076-18 to measure transformer winding deformation. It detects the amplitude-frequency response characteristics of each transformer winding and makes longitudinal or transverse comparisons of the test results. Based on the degree of change in the amplitude-frequency response characteristics, it determines the possible deformation of the transformer windings.
This system consists of a measurement part and an analysis software part. The analysis part is completed by a laptop computer, and the measurement part is connected to the laptop via a USB cable.
Main Technical Features
l
Adopts the sweep frequency method to measure transformer winding characteristics, without lifting the transformer cover or disassembling it, by detecting the amplitude-frequency response characteristics of each winding, accurately measuring the distortion, bulging, or displacement deformation of windings for transformers of 6kV and above.
l Fast measurement speed, with a measurement time of 1-2 minutes for a single winding.
l Very high frequency accuracy, with a frequency accuracy of 0.005%.
l Uses digital frequency synthesis for higher frequency stability.
l Adopts 5000V voltage isolation to fully protect the test computer's safety.
l Can load up to 9 curves simultaneously, with automatic calculation of relevant parameters for each curve, automatic diagnosis of winding deformation, and provision of diagnostic reference conclusions.
l The analysis software used is powerful, and the software and hardware indicators meet the electric power industry standard DL/T911-2016 and the international electrotechnical standard IEC60076-18.
l Uses the Windows platform, compatible with Windows 2000/Windows XP/Windows7/windows8/windows10.
l Uses a database to save test data, making the management of test data simple and convenient.
l The software has powerful management functions, fully considering the needs of on-site use. Measurement data is automatically saved and automatically exported to generate Word-format test reports (requires the installation of corresponding Office software) or JPG image reports, making it convenient for users to produce test reports.
l The software is highly intelligent. After the input and output signals are connected, only one key press is needed to complete all measurement work.
l The software interface is simple and intuitive. Menus for analysis, storage, report export, printing, etc., only automatically pop up the next required menu after completing the current step, making it more convenient.
1.2 Main Technical Indicators
l Measurement speed: 1-2 minutes for a single-phase winding
l Output voltage: Vpp-20V, automatically adjusted during the test
l Output impedance: 50Ω
l Input impedance: 1MΩ (response channel built-in 50Ω matching resistor)
l Sweep frequency range: 100Hz - 2MHz
l Frequency accuracy: 0.005%
l Sweep mode: linear or logarithmic, with arbitrary settings for sweep interval and points
l Curve display: amplitude-frequency curve
l Wide measurement dynamic range: -120dB to 20dB
l Power supply voltage: AC220V±10%
System Simple Operation Process
Ø Ground the collector
Ø Connect the collector to the transformer winding
Ø Connect the collector to the computer
Ø Power on the computer
Ø Power on the collector
Ø Log in to the software
Ø Enter information
Ø Select the termination frequency and adjust test parameters
Ø Select the winding
Ø Start the test
Ø Change the test winding
Ø Select the winding
Ø Start the test
Ø Repeat the above process until all winding tests are completed
Ø Save data
Ø Analyze data
Ø Export report
Ø Close the software
Ø Turn off the collector power
Ø Disconnect the collector from the computer
Ø Disconnect the transformer wiring
Ø Test completed.
II Preparation Work
Note: The basic operations involving the computer and the Windows operating system in the user manual are not covered in this manual; please refer to relevant computer books.
Note: The basic operations of the Windows operating system in the user manual are based on the Windows 7 operating system. Differences between other Windows systems and Windows 7 operations are not covered in this manual; please refer to relevant computer books.
Degree of Winding Deformation |
Correlation Coefficient R |
Severe Deformation |
RLF ＜ 0.6 |
Obvious Deformation |
1.0 ＞ RLF ≥0.6 or RMF ＜0.6 |
Mild Deformation |
2.0 ＞ RLF ≥1.0 or 0.6 ≤ RMF ＜1.0 |
Normal Winding |
RLF ≥ 2.0 and RMF ≥1.0 and RH F ≥0.6 |
Note: RLF is the correlation coefficient of the curve in the low-frequency band (1kHz～100kHz);
RMF is the correlation coefficient of the curve in the mid-frequency band (100kHz～600kHz);
RHF is the correlation coefficient of the curve in the high-frequency band (600kHz～1000kHz). |
