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FRAX-II Power Transformer Winding Frequency Response Tester is produced and sold by Shanghai Xuji Electric Co., Ltd.FRAX-II Power Transformer Winding Frequency Response Tester,"FRAX-II Power Transformer Winding Frequency Response Tester" is based on the measurement of internal winding characteristic parameters of transformers, adopting the currently world-advanced internal fault frequency response analysis (FRA) method, which can accurately judge 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. Thus, the frequency domain characteristic response of each coil is also determined, and the frequency spectra of the corresponding three-phase coils have a certain comparability.
During the test process, if inter-turn or phase-to-phase short circuits occur, or impact during transportation causes relative displacement of coils, or electromagnetic force during near-zone short circuit faults in operation causes coil deformation, the distributed parameters of the transformer winding will change. This further affects and changes the original frequency domain characteristics of the transformer, such as amplitude changes in frequency response and shifts in resonant frequency points. Based on the frequency response analysis method, combined with the internal structure of the transformer, the developed "FRAX-II Power Transformer Winding Frequency Response Tester" is a new non-destructive testing device for internal faults of transformers. It is suitable for detecting internal structural faults of 10kV~500kV power transformers.
"FRAX-II Power Transformer Winding Frequency Response Tester" quantifies the response changes of internal winding parameters in different frequency domains, and determines the degree of change of internal winding based on the magnitude of change, the amplitude, region, and trend of frequency response changes. Then, based on the measurement results, it can determine whether the transformer has been severely damaged and whether major repair is needed.
For transformers in operation, regardless of whether frequency domain characteristic diagrams have been saved in the past, by comparing the differences in characteristic spectra between coils of a faulty transformer, the degree of fault can also be judged. Of course, if a set of original winding characteristic diagrams of the transformer is saved, it is easier to provide a more powerful basis for the operating status, post-accident analysis, and maintenance of the transformer.
Main Technical Parameters
1. Frequency range:
0.5～10kHz
10～100kHz
100～500kHz
500～1000kHz/2000kHz
2. Amplitude display range: 120dB
3. Amplitude measurement accuracy: frequency deviation fni ≤0.02%
Amplitude resolution 0.01dB
4. Built-in lithium battery and charging management circuit: can work continuously for 6-7 hours per charge without mains power
5. Measurement time per phase coil: < 30 seconds
5. Weight: 8kg (including packaging box and basic configuration)
6. Volume: 530×300×280mm (including external aluminum alloy case)
Note: The above information and technical parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
