product overview

The ETRZ-V transformer winding deformation tester uses the internal fault frequency response analysis (FRA) method, which is currently being developed and improved in developed countries around the world, to accurately diagnose internal faults in transformers based on the measurement of characteristic parameters of the transformer winding.
After the completion of transformer design and manufacturing, its coil 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) for each coil should be determined. Therefore, the frequency domain characteristic response of each coil is also determined, and the corresponding frequency spectra between the three-phase coils have a certain comparability.
During the testing process, the transformer may experience inter turn or inter phase short circuits, or collisions during transportation, resulting in relative displacement of the coils. Additionally, during operation, the distribution parameters of the transformer winding may change due to electromagnetic tension caused by short circuits and faults. Furthermore, it affects and alters the original frequency domain characteristics of the transformer, such as amplitude changes in frequency response and harmonic frequency point shifts. The ETRZ-V transformer winding frequency response tester, developed based on response analysis methods, is a novel non-destructive testing device 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 internal winding parameters of the transformer in different frequency domains, and determines the degree of change in the internal winding of the transformer based on the magnitude of the change, the amplitude and region of the frequency response change, and the trend of the frequency response change. Therefore, the measurement results can be used to determine whether the transformer has been severely damaged and whether major repairs are needed. For transformers in operation, regardless of whether frequency domain feature maps have been saved in the past, the degree of fault can also be determined by comparing the differences in feature maps between faulty transformer coils. Of course, if a set of original winding characteristic maps of the transformer is saved, it is easier to provide more accurate and powerful basis for the operation status, post accident analysis, and maintenance of the transformer.
The transformer winding deformation frequency response tester consists of a high-precision measurement system composed of a laptop and a microcontroller. It has a compact structure, simple operation, and complete testing and analysis functions. It can be operated and used by referring to the user manual or after short-term training.

Product characteristics

1. The transformer winding deformation tester adopts high-speed and highly integrated microprocessors for acquisition and control
2. USB interface for communication between laptop and instrument
3. Wireless Bluetooth interface for communication between laptop and instrument
4. The hardware core adopts DDS dedicated digital high-speed scanning 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
5. High resolution dB measurement, dual channel 16 bit A/D (on-site testing shows significant output changes by changing the tap changer)
6. The signal output amplitude can be adjusted by software, with a maximum peak amplitude of ± 10V
7. The computer generates electronic documents (Word) of the detection results
8. Selecting precision and high stability components, conducting repeated tests on the same phase, with a measurement repetition rate of over 99.5%
9. Finished circuit board with special surface treatment, resistant to water and harmful gas pollution
10. The transformer winding deformation tester produced by our company has dual measurement system functions of linear sweep frequency measurement and segmented sweep frequency measurement, and is compatible with the measurement modes of two current domestic technology schools
11. The amplitude frequency characteristics comply with the technical specifications of the national amplitude frequency characteristic tester. The horizontal axis (frequency) has two types of divisions: linear division and logarithmic division, so it is called
The printed curve can be a linear or logarithmic scale curve, and users can choose according to their actual needs
12. The automatic analysis system for detection data compares the winding similarity between phases A, B, and C horizontally, and the result is:
① Good consistency
② Good consistency
③ Poor consistency
④ Poor consistency
The longitudinal comparison of A-A, B-B, C-C retrieves the original data and compares the winding deformation with the current data in phase. The result is:
① Normal winding
② Mild deformation
③ Moderate deformation
④ Severe deformation
13. Automatically generate Word electronic documents for saving and printing
14. Fully meet the technical requirements of the power standard DL/T911-2004 "Frequency Response Analysis Method for Winding Deformation of Power Transformers"

productparameter

1. Scanning method: (The instrument has a dual measurement system of linear sweep frequency measurement and segmented sweep frequency measurement)
(1) Linear scanning distribution
Sweep frequency measurement range: (1kHz)~(2MHz), 2000 sweep frequency points, resolution of 1kHz
(2) Segmented sweep frequency measurement distribution
Sweep frequency measurement range: (0.5kHz)~(1MHz), 2000 sweep frequency points;
(0.5kHz)~(10kHz), with a resolution of 0.02kHz
(10kHz)~(100kHz), resolution of 0.2kHz
(100kHz)~(500kHz), with a resolution of 1kHz
(500kHz)~(1000kHz), with a resolution of 1kHz
2. Other technical parameters:
(1) Range of amplitude measurement: (-100dB) to (+20dB)
(2) Amplitude measurement accuracy: 0.1dB
(3) Scanning frequency accuracy: less than 0.01%
(4) Signal input impedance: 1M Ω
(5) Signal output impedance: 50 Ω
(6) Same phase test repetition rate: 99.5%
(7) Measurement instrument dimensions (length x width x height): 300 x 340 x 120mm ³
(8) Instrument aluminum alloy packaging box dimensions (length x width x height): 310 x 400 x 330mm ³
(9) Overall weight: 10kg

Other name

Transformer winding deformation tester, transformer winding deformation detector, transformer winding deformation measuring instrument, transformer winding deformation analyzer