The transformer winding deformation tester is an important device used to detect the mechanical deformation of the internal winding of transformers. Its core principle is based on frequency response analysis (FRA), which accurately determines whether the winding has undergone distortion, displacement, bulging and other deformations by comparing the electrical characteristics of the winding at different frequencies. The following provides a detailed analysis of technical principles, functional characteristics, operating methods, application scenarios, and key points for purchasing:
1. Technical principles
Under the action of high-frequency voltage, the transformer winding can be regarded as a passive linear dual port network composed of distributed parameters such as inductance, capacitance, and resistance, and its frequency response characteristics are described by the transfer function H (j ω). When the winding deforms, the internal distributed inductance, capacitance and other parameters change, causing changes in the zero and pole points of the transfer function, which in turn causes a shift or distortion in the frequency response characteristics (amplitude frequency, phase frequency curve). By comparing historical data or differences in frequency response curves between three-phase windings, the degree of winding deformation can be quantitatively evaluated.
2. Functional characteristics
① High precision frequency scanning technology
Frequency band coverage: usually supports linear sweep (1kHz-2MHz) or segmented sweep (such as 0.5kHz-10kHz, 10kHz-100kHz, etc.), with a resolution of up to 0.02kHz-1kHz, meeting the detection needs of different transformers.
Dynamic range: The amplitude measurement range is generally -100dB to+20dB, with an accuracy of ± 0.1dB, ensuring that even small deformations can be captured.
② Dual mode measurement system
Compatible with both linear sweep and segmented sweep modes, adapting to the measurement habits of different technical schools in China.
③ Intelligent data analysis
Automatic diagnosis: Built in expert system can automatically analyze the winding status (normal, mild/moderate/severe deformation) and generate diagnostic reports.
Historical Curve Comparison: Supports the overlay analysis of multiple historical curves, which can horizontally compare the similarity of three-phase windings and vertically track the deformation trend of the same winding over time.
④ Convenient operation and secure design
Plug and play: Connect to a laptop through a USB interface, with a user-friendly interface and support for Windows systems.
Anti interference capability: Using isolated power supply, the hardware core integrates DDS digital high-speed frequency scanning technology, effectively suppressing electromagnetic interference.
High repeatability: The repeatability rate of in-phase testing is ≥ 99.5%, ensuring stable and reliable measurement results.
3. Operation method
① Wiring and preheating
Remove the transformer connection busbar, connect the excitation terminal (orange), reference terminal (blue), and response terminal (green) of the tester to the corresponding winding terminals, and ensure that the grounding terminal is reliably grounded.
Preheat the instrument for 15 minutes (extended for low-temperature environments) to ensure measurement accuracy.
② Parameter settings
Select parameters such as sweep mode (linear/segmented), frequency range, and measurement points in the software.
Enter basic information of the transformer (such as model, voltage level, tap changer position, etc.) for subsequent analysis.
③ Data Collection and Analysis
Start measurement, the instrument automatically completes frequency scanning and generates amplitude frequency/phase frequency response curves.
By using software for horizontal (three-phase) or vertical (historical data) comparison, the system automatically provides deformation diagnosis results.
④ Report generation
Support Word format report output, including test data, curve graphs, diagnostic conclusions, and recommended measures.
4. Application scenarios
Factory test: Verify whether the new transformer winding structure meets the design requirements.
Handover test: Before the equipment is put into operation, check whether winding deformation occurs during transportation or installation.
Regular maintenance: Evaluate the health status of the windings of the transformer during operation to prevent sudden failures.
Fault diagnosis: After the transformer is subjected to short-circuit impact, quickly determine whether the winding is damaged and the degree of deformation.
5. Key points for purchasing
① Performance indicators
Frequency response range: Priority should be given to devices with wide frequency coverage (such as 0.5kHz-2MHz) and high resolution.
Measurement accuracy: amplitude accuracy ± 0.1dB, frequency accuracy ≤ 0.01% is preferred.
② Functional practicality
Dual mode measurement: compatible with linear and segmented frequency scanning, suitable for different detection needs.
Data analysis capabilities: Functions such as automatic diagnosis, historical curve comparison, and report generation can significantly improve efficiency.
③ Convenience of operation
The instrument is compact in size and lightweight (e.g. ≤ 5kg), making it easy to carry on site.
The software interface is intuitive and supports one click operation, reducing the requirement for personnel skills.
ZC-206A transformer winding deformation tester detects the amplitude frequency response characteristics of each winding of the transformer, compares the detection results vertically or horizontally, and judges the possible deformation of the transformer winding according to the change degree of amplitude frequency response characteristics.
Kvtester Electronics Technology Co.,Ltd. is a high-tech enterprise specializing in power testing, testing, research and development, production, and sales of testing equipment. It has been engaged in the electrical testing industry for many years, and its products are of high quality. We welcome customers to come and purchase. Service hotline: 0086-27-81778799, to learn more, visit the official website: www.kvtester.com
