Product Overview
Once the design and manufacturing of a transformer are complete, its coils and internal structure become fixed. Consequently, for a multi-winding transformer, if the voltage levels and winding methods are identical, the corresponding parameters (Ci, Li) for each individual coil should be uniquely determined. As a result, the frequency-domain characteristic response of each coil is likewise established, rendering the frequency signatures of the corresponding three-phase coils comparable to one another.
Product Features
1. Data acquisition and control are managed by a high-speed, highly integrated microprocessor.
2. A USB interface facilitates communication between a laptop computer and the instrument.
3. The measurement instrument is integrated with an industrial PC, eliminating the need to use a separate portable computer at the test site.
4. The hardware core utilizes dedicated high-speed digital sweep frequency technology (DDS) of U.S. origin; through testing, it can accurately diagnose faults such as winding distortion, bulging, displacement, tilting, inter-turn short circuits, and inter-phase contact short circuits.
5. Features high-speed, dual-channel 16-bit A/D sampling (during field tests, changing the tap changer position results in distinct changes in the waveform curves).
6. Signal output amplitude is software-adjustable, with a maximum peak amplitude of ±10V.
7. The computer automatically generates an electronic document (Word format) containing the test results.
8. The instrument features a dual measurement system capable of both linear sweep frequency measurement and segmented sweep frequency measurement, thereby accommodating the measurement modes of the two prevailing technical schools of thought currently practiced domestically.
9. The amplitude-frequency characteristics comply with national technical specifications for amplitude-frequency response analyzers. The horizontal axis (frequency) offers both linear and logarithmic scaling options; consequently, printed curves can be displayed with either linear or logarithmic scales, allowing users to select the format best suited to their specific needs.
10. Automated Data Analysis System:
**Lateral Comparison:** Compares the windings across the three phases (A, B, and C) to assess their similarity.
The analysis results are categorized as:
① Excellent consistency
② Good consistency
③ Poor consistency
④ Very poor consistency
**Longitudinal Comparison:** Retrieves historical data and compares it against current data for the same phase (A-A, B-B, C-C) to assess winding deformation.
The analysis results are categorized as:
① Normal winding
② Slight deformation
③ Moderate deformation
④ Severe deformation
11. Automatically generates a Word-format electronic document for archiving and printing.
12. The instrument fully complies with the technical requirements specified in the power industry standard DL/T911–2004, "Frequency Response Analysis Method for Winding Deformation of Power Transformers."
扫描方式
1. 线性扫描分布
扫频测量范围：(10Hz)-(10MHz)40000扫频点、分辨率为0.25kHz、0.5kHz和1kHz。
2. 分段扫频测量分布
扫频测量范围：(0.5kHz)-(1MHz)、2000扫频点；
(0.5kHz)-(10kHz)
(10kHz)-(100kHz)
(100kHz)-(500kHz)
(500kHz)-(1000kHz)
3.2其他技术参数
1. 幅度测量范围: (-120dB)至(+20dB)
2. 幅度测量精度: 0.1dB
3. 扫描频率精度: 0.01%
4. 信号输入阻抗：1MΩ
5. 信号输出阻抗：50Ω
6. 信号输出幅值：±20V
7. 同相测试重复率：99.9%
8. 测量仪器尺寸(长宽高)355X145X270(mm)
9. 仪器铝合金箱尺寸(长宽高)410X360X350(mm)
10.总体重量:17Kg
Once a transformer has been designed and manufactured, its coils and internal structure are permanently established. Consequently, for a multi-winding transformer—provided the voltage levels and winding methods remain consistent—the specific parameters (Ci, Li) corresponding to each individual coil should be fixed values. As a result, the frequency-domain characteristic response of each coil is also determined; this ensures that the frequency-domain signatures of the corresponding three-phase coils exhibit a certain degree of comparability.
If a transformer experiences inter-turn or inter-phase short circuits during testing, suffers coil displacement due to impact during transportation, or undergoes coil deformation caused by electromagnetic forces during short-circuit or fault conditions in operation, the distributed parameters of its windings will inevitably change. This, in turn, affects and alters the transformer's original frequency-domain characteristics—manifesting as changes in response amplitude, shifts in resonance frequencies, and other deviations. Developed based on frequency response analysis techniques, the HX021 Transformer Winding Frequency Response Tester represents a novel piece of non-destructive testing equipment designed specifically for detecting internal transformer faults. It is suitable for detecting internal structural faults in power transformers ranging from 63 kV to 500 kV.
The Transformer Winding Deformation Frequency Response Tester functions by quantifying the changes in the transformer's internal winding parameters across various frequency domains. By analyzing the magnitude of these changes—specifically the amplitude, frequency range, and overall trend of the frequency response variations—the device determines the extent of any internal winding alteration. Consequently, based on these measurement results, it is possible to assess whether the transformer has sustained severe damage and whether a major overhaul is required.
For transformers currently in service—regardless of whether historical frequency-domain characteristic data has been archived—the severity of a fault can still be assessed by comparing the characteristic signatures among the coils of the affected transformer. Naturally, if a baseline set of the transformer's original winding characteristic signatures is available, it becomes even easier to provide precise and robust evidence for evaluating the transformer's operational status, conducting post-incident analyses, and planning maintenance and repairs.
The Transformer Winding Deformation Frequency Response Tester comprises a high-precision measurement system integrated with a laptop computer and a microcontroller unit. Featuring a compact design, simple operation, and a comprehensive suite of testing and analysis functions, the device can be operated independently by users simply by consulting the instruction manual or undergoing a brief training session.
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