Transformer Winding Deformation Tester
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The Transformer Winding Deformation Tester adopts the internal fault frequency response analysis (FRA) method, which is being developed and perfected in developed countries, and can make accurate judgments on internal faults of transformers..After the transformer design and manufacturing are completed, its coils and internal structure are determined. Therefore, for a multi-winding transformer coil, if the voltage levels are the same and the winding methods are the same, the corresponding parameters (Ci, Li) of each coil should be determined. Therefore, the frequency domain characteristic response of each coil is also determined accordingly, and the frequency spectrum of the corresponding three-phase coils has a certain comparability. If a short circuit between turns or phases occurs during the test, or a collision occurs during transportation, causing relative displacement of the coils, or deformation of the coils due to electromagnetic force during short circuit and fault conditions during operation, the distributed parameters of the transformer winding will change. This in turn affects and changes the original frequency domain characteristics of the transformer, that is, the frequency response undergoes amplitude changes and resonance frequency point shifts. The Transformer Winding Deformation Frequency Response Tester quantifies the response changes of the internal winding parameters of the transformer in different frequency domains, and determines the degree of change of the internal winding of the transformer based on the magnitude of the change, the amplitude of the frequency response change, the region, and the trend of the frequency response change. Then, based on the measurement results, it can determine whether the transformer has been seriously damaged and whether major repair is needed.
Main Technical Features
☆ The acquisition control adopts a high-speed, highly integrated microprocessor.
☆ USB communication interface between PC and instrument.
☆ The hardware movement adopts DDS dedicated digital high-speed frequency sweep technology (USA), which can accurately diagnose faults such as winding distortion, bulging, displacement, tilting, inter-turn short circuit deformation, and phase-to-phase contact short circuit through testing.
☆ High-resolution dB value measurement, dual-channel 16-bit A/D (changing the tap changer during field test will result in obvious output changes).
☆ The signal output amplitude can be adjusted by software, with a maximum amplitude peak of ±10V.
☆ The computer generates electronic documents (WORD) from the test results.
☆ Precision, high-stability components are selected, and for repeated tests on the same phase, the measurement repeatability rate is above 99.5%.
☆ The finished circuit board has special surface treatment, with resistance to water and harmful gas pollution.
☆ The laptop and measuring instrument are powered by isolated power supplies to eliminate external interference.
☆ The instrument has a dual measurement system function of linear frequency sweep measurement and segmented frequency sweep measurement, compatible with the measurement modes of the two current domestic technical schools.
☆ The amplitude-frequency characteristics comply with the national technical indicators for amplitude-frequency characteristic testers. The horizontal coordinate (frequency) has both linear and logarithmic scales, so the printed curves can be either linear scale curves or logarithmic scale curves.
☆ Automatically generates Word electronic documents for saving and printing.
(The instrument has a dual measurement system of linear frequency sweep measurement and segmented frequency sweep measurement)
(1) Linear sweep distribution
Sweep frequency measurement range: (1kHz)-(2MHz), 2000 sweep points, resolution of 1kHz
(2) Segmented sweep measurement distribution
Sweep frequency measurement range: (0.5kHz)-(1MHz), 2000 sweep points;
(0.5kHz)-(10kHz), resolution of 0.02kHz
(10kHz)-(100kHz), resolution of 0.2kHz
(100kHz)-(500kHz), resolution of 1kHz
(500kHz)-(1000kHz), resolution of 1kHz
3.2 Other technical parameters:
