| Customization: | Available |
|---|---|
| After-sales Service: | After Sales Service |
| Warranty: | 1 Year |
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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".
| Amplitude measurement range | (-120dB) to (+20dB) |
| Amplitude measurement accuracy | 0.1dB |
| Scanning frequency accuracy | 0.005% |
| Signal input impedance | 1MΩ |
| Signal output impedance | 50Ω |
| Signal output amplitude | ±20V |
| Same-phase test repetition rate | 99.9% |
| Measuring instrument size | 370X300X170 (mm) |
| Overall weight | 13Kg |
| Operating temperature | -10ºC to +40ºC |
| Storage temperature | -20ºC to +70ºC |
| Relative humidity | <90%, non-condensing |
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