UHV-310 Sweep Frequency Response Analyzer（FRA Test Set）

• 1、Transformer winding deformation test instrument acquisition and control adopt high speed and high integration microprocessor.

• 2、USB interface for laptop with instrument communication

• 3、No line bluetooth interface between laptop and instrument

• 4、The hardware movement adopts DDS special digital high-speed frequency sweeping technology (USA). Through the test, the faults of winding distortion, bulge, shift, tilt, short-circuit deformation between turns and pick up short-circuit between phases can be accurately diagnosed

• 5、High-resolution dB value measurement, dual-channel 16-bit A/D

• 6、The signal output amplitude can be adjusted by software to a maximum peak of 10V

• 7、The computer generates an electronic document of the results(Word)

• 8、Select precise and highly stable components, repeat the test on the same phase, and measure the repetition rate above 99.5%

• 9、Finished circuit board, surface is specially treated, resistant to water and harmful gas pollution

• 10、The Transformer winding deformation test instrument produced by our company has the functions of linear sweep frequency measurement and piecewise sweep frequency measurement, and is compatible with the measuring modes of the current two domestic technical schools

• 11、The amplitude-frequency characteristic conforms to the national technical index of amplitude-frequency characteristic test instrument. The abscissa (frequency) has two kinds of line-like indexing and logarithmic indexing, so the printed song line can be either line-like or logarithmic indexing line, which can be selected by the user according to the actual situation

• 1、Frequency Response Measurement: It measures the frequency domain characteristics (amplitude vs. frequency) of transformer windings over a wide frequency range. The system offers two sweep modes:
  Linear Sweep: From 1kHz to 1MHz.
  Segmented Sweep: From 0.5kHz to 1MHz, divided into specific bands (e.g., 0.5-10kHz, 10-100kHz, etc.) for detailed analysis.

• 2、High-Resolution Data Acquisition: It uses a dual-channel 16-bit A/D converter for high-resolution amplitude measurements across a wide dynamic range (-100dB to +20dB). The signal output amplitude is software-adjustable up to a peak of 10V.

• 3、Multiple Interface Options: The instrument provides flexible connectivity, including a USB interface for direct connection to a laptop and an optional wireless Bluetooth interface, eliminating the need for physical cables.

• 4、Signal Generation: It uses DDS (Direct Digital Synthesis) dedicated digital high-speed sweep technology to generate stable, precise test signals with a sweep accuracy of 0.01%.

• 5、Measurement Stability: It is built with precise, highly stable components. When repeating tests on the same phase, it achieves a repetition rate of 99.5% or higher, ensuring reliable comparison of results.

• 6、Computer-Based Analysis: The instrument is operated via a laptop computer. The accompanying software generates detailed reports in Microsoft Word format and allows for curve display and comparison.

• 1、Non-Destructive and Accurate: It provides a sensitive, non-invasive method to detect winding deformations, displacements, and other internal faults that cannot be identified by standard electrical tests (e.g., DC resistance, turns ratio).

• 2、High Sensitivity to Mechanical Changes: The SFRA method is highly sensitive to mechanical changes in the winding structure, such as those caused by short-circuit forces, transportation damage, or aging.

• 3、Advanced Technology: The use of DDS technology ensures high sweep accuracy, and the dual-channel 16-bit A/D converter provides high-resolution measurements, improving the detection of subtle changes in the frequency response.

• 4、Versatility and Compatibility: It supports both linear and segmented sweep modes, making it compatible with the measurement practices of the two main domestic technical schools in China. It provides a flexible analysis approach.

• 5、Ease of Use and Portability: The instrument is lightweight (10kg) and comes in a durable aluminum alloy carrying case. It is operated via a laptop, and the software facilitates easy data storage, analysis, and report generation.

• 1、Factory Acceptance Testing: Used by transformer manufacturers to establish a baseline frequency response "fingerprint" for new transformers, which is essential for future comparisons.

• 2、Substation Commissioning: Performed on new transformers after installation and before energization to confirm that no mechanical damage occurred during transport and installation.

• 3、Post-Fault Assessment: A key diagnostic tool used after a transformer experiences a short-circuit fault or a lightning strike. It can detect winding deformations or core movements that could lead to future failure.

• 4、Routine Maintenance and Monitoring: Incorporated into preventive maintenance programs to track the mechanical condition of critical transformers over time, helping to plan interventions.

• 5、Failure Investigation: Used in conjunction with other diagnostic tests to investigate the root cause of a transformer failure.

• 1、What is SFRA and why is it important?
  SFRA is a diagnostic technique that compares the frequency response signature of a transformer's windings to a reference signature. Changes in this signature can indicate mechanical faults like winding deformation, displacement, or core movement. It is important because these mechanical faults can lead to catastrophic transformer failure and are not easily detected by standard electrical tests like DC resistance or turns ratio.
• 2、What types of transformers can the SFRA test?
  It is suitable for power transformers from 63kV to 500kV. In practice, SFRA testing is applicable to transformers of various sizes and voltage classes where mechanical integrity is a concern.
• 3、What is the difference between linear and segmented sweep modes?
  Linear sweep measures the frequency response over a continuous range (1kHz to 1MHz) in a linear fashion. It is useful for a broad overview.
  Segmented sweep divides the spectrum into specific bands (e.g., low, medium, high frequencies). This allows for more detailed analysis in the frequency ranges most sensitive to specific types of faults. The UHV-310 Sweep Frequency Response Analyzer provides both modes, offering flexibility based on the test standards and analysis preferences.
• 4、How is the test data managed and analyzed?
  The UHV-310 Sweep Frequency Response Analyzer is operated via a laptop with dedicated software. The software controls the test, displays the amplitude-frequency response curves, and allows for comparison of current measurements against historical references. The results can be exported directly to a Microsoft Word document to generate professional test reports, simplifying documentation and analysis.
• 5、What does the "repetition rate" mean, and why is it important?
  The repetition rate refers to the consistency of the measurement when repeating the test on the same transformer phase without any changes. The UHV-310 Sweep Frequency Response Analyzer boasts a repetition rate of 99.5% or higher. A high repetition rate is crucial for confidence in the test data, as it ensures that any observed changes between tests are due to actual changes in the transformer's condition, not due to measurement instability.

Enterprise products in strict accordance with international and national standards and rules of industry production, through the national, provincial and municipal electric power research institute and electric power authorities detection, measuring center, fully passed the ISO9001 international quality management system certification, the licence for manufacturing measuring instruments of the People's Republic of China, GB/T19001-2016 quality management system requirements, GB/T24001-2016 environmental management system requirements, GB/T45001-2020 occupational health and safety management system requirements.

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